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  • 51. Barrett, Paul M.
    et al.
    Rich, Thomas H.
    Vickers-Rich, Patricia
    Tumanova, Tat'yana A.
    Inglis, Matthew
    Pickering, David
    Kool, Lesley
    Kear, Benjamin P.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Ankylosaurian dinosaur remains from the Lower Cretaceous of southeastern Australia2010Ingår i: Alcheringa, ISSN 0311-5518, E-ISSN 1752-0754, Vol. 34, nr 3, s. 205-217Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Eumeralla and Wonthaggi formations (Otway and Strzelecki groups, respectively: late Hauterivian to Albian) of Victoria, Australia, have yielded diverse dinosaur faunas. Here we report a set of unassociated isolated specimens from these units including teeth, dorsal vertebrae, ribs and osteoderms of an indeterminate ankylosaurian dinosaur.

  • 52.
    Bartol, Milos
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Henderiks, Jorijntje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Nannofossil assemblage shifts in the aftermath of the Miocene Climatic Optimum - a North Atlantic latitudinal transect2015Konferensbidrag (Övrigt vetenskapligt)
  • 53.
    Bassett, M Ichael G.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Holmer, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Palaeobiology.
    Popov, Leonid E.
    Cambrian brachiopoda of the Rift Valley, Jordan and Israel2004Konferensbidrag (Övrigt vetenskapligt)
  • 54.
    Bassett, MG
    et al.
    National Museums & Galleries of Wales, Department of Geology, Cardiff , Wales.
    Popov, LE
    National Museums & Galleries of Wales, Department of Geology, Cardiff , Wales.
    Holmer, LE
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Organophosphatic brachiopods: Patterns of biodiversification and extinction in the early Palaeozoic1999Ingår i: Geobios, ISSN 0016-6995, E-ISSN 1777-5728, Vol. 32, nr 2, s. 145-163Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    From a database of 226 Cambrian - Ordovician genera of organophosphatic-shelled brachiopods comprisingthe Subphylum Linguliformea, 11 sets of morphological characters typify all orders and superfamilies. Seven sets of these large-scale evolutionary novelties were established already by the end of the mid Cambrian, 2 more by the end of the late Cambrian, and the remaining 2 before the end of the Arenig. The earliest linguliformeans are of Tommotian age and represent some of the oldest known benthic organisms with a mineralised skeleton. Major diversification at the generic level took place during the mid and late Cambrian, by which time members of the Order Lingulida spread from near-shore to deep-water environments and became dominant in low diversity benthic assemblages that inhabited mobile sandy bottoms. There was a significant decline in diversity of linguliformeans during the latest Cambrian. Following recovery in the late Tremadoc-early Arenig, they then became one of the most distinctive components of benthic assemblages inhabiting marginal environments, e.g. eutrophic basins, shallow mobile sands, and abyssal depths. During the Llanvirn, there was a significant, worldwide turnover in linguliformean brachiopod faunas, when the majority of epibenthic lingulides of the families Obolidae, Zhanatellidae and Elkaniidae became extinct and were replaced, in shallow marine biofacies, by assemblages dominated by bivalved molluscs and burrowing lingulides. There is no trace until the mid Ashgill of a significant decline of micromorphic taxa in linguliformean assemblages characteristic of outer shelf environments. However, all siphonotretides, paterinides and most acrotretide genera disappeared towards the end of the late Ordovician pre-Hirnantian Dicellograptus anceps Biozone.

  • 55. Bassett, M.G.
    et al.
    Popov, L.E.
    Holmer, L.E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    The oldest-known metazoan parasite?2004Ingår i: Journal of Paleontology, ISSN 0022-3360, E-ISSN 1937-2337, Vol. 78, nr 6, s. 1214-1216Artikel i tidskrift (Refereegranskat)
  • 56. Bassett, Michael G.
    et al.
    Popov, L. E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Holmer, L. E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Brachipods: Cambrian-Tremadoc precursors to Ordovician radiation events2002Ingår i: Palaeobiogeography and Biodiversity Change: the Ordovician and Mesozoic-Cenozoic Radiations / [ed] James Alastair Crame, Alan Wilfrid Owen, Geological Society of London, 2002, Vol. 194, s. 13-23Kapitel i bok, del av antologi (Refereegranskat)
  • 57. Bassett, Michael G.
    et al.
    Popov, L. E.
    Holmer, L. E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Functional morphology of articulatatory structures and implications for patterns of musculature in Cambrian rhynchonelliform brachiopods.2001Ingår i: Brachiopods Past and Present / [ed] H. Brunton, L.R.M. Cocks and S.L. Long, London: Department of Palaeontology. The Natural History Museum , 2001, Vol. 63, s. 163-176Kapitel i bok, del av antologi (Refereegranskat)
  • 58.
    Bassett-Butt, Lewis
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica2015Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The origin of many lophotrochozoan groups can be traced to “small shelly fossil” (SSF) faunas of the Early Cambrian. Antarctica is a key region of study, due to the continent’s known close geographical proximity to well-studied Australian and Indian basins in in the Cambrian. Few studies have focused on this region however, due to a paucity of data. Re-examination of camenellan sclerites from the Early Cambrian Shackleton Limestone of the Churchill Mountains of Antarctica has revealed a previously unidentified species of Dailyatia in the formation, co-occurring alongside previously described Dailyatia odyssei Evans and Rowell, 1990, as in the Arrowie Basin of Australia. Re-examination of material previously described as Kennardia sp. A and Kennardia sp. B has indicated that these taxa can likely be synonymized as a second species of Dailyatia. Dailyatia sclerites were also found in the temporally equivalent “Schneider Hills Limestone” formation, which cropsout in the Argentina Range of Antarctica. These specimens appear to belongto a third species of Dailyatia, suggesting that the spatial distribution of tommotiids in the Early Cambrian was more complex than previously recognized, and that the group may be useful in future biostratigraphic studies. A study ofthe Middle Cambrian (Drumian Stage) Nelson Limestone Formation of the Neptune Range, Antarctica has revealed a moderately diverse brachiopod and trilobite fauna. The brachiopods have strong faunal links to taxa from South Australia and India, as well as other parts of the Antarctic province, fitting independent strong evidence for a united East Gondwanan region in the Middle Cambrian. An unidentified camenellan tommotiid sclerite is also described from the Nelson Limestone. This extends the worldwide temporal range of the tommotiid clade into the Drumian Stage, and suggests that more basal members of the brachiopod stem-group survived to form part of a more diverse Middle Cambrian fauna.

    Delarbeten
    1. Systematics, biostratigraphy and biogeography of brachiopods and other fossils from the Middle Cambrian Nelson Limestone, Antarctica
    Öppna denna publikation i ny flik eller fönster >>Systematics, biostratigraphy and biogeography of brachiopods and other fossils from the Middle Cambrian Nelson Limestone, Antarctica
    2016 (Engelska)Ingår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, nr 3, s. 377-392Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    An assemblage dominated by acrotretid brachiopods (Prototreta millsi Brock and Percival, 2006) is described from the Nelson Limestone of the Transantarctic Mountains, Antarctica. The formation also includes paterinids (Micromitra sp. cf. M. nerranubawu Kruse, 1990 and Dictyonina australis Roberts, 1990), lingulids (Oepikites haimantensis Reed, 1910)and acrothelids (Acrothele sp. cf. A. vertex Reed, 1910). The macrofauna also contains orthids (Diraphora dyunyin Kruse, 1990). The associated fauna include sponge spicules present in vast abundance. Other recognisable small shelly fossils (including chancelloriids and hyolithelminths) make up a small section of the fauna. Trilobites (including Nelsonia schesis Palmer and Gatehouse, 1972 and Solenopleura pruina Palmer and Gatehouse, 1972) belong to taxa previously described from the Nelson Limestone and support the Drumianage proposed for the formation. Palaeobiogeographic analysis indicates that the brachiopod fauna corroborates previously described strong links with Australasia and also suggests a strong link to Indian material, corroborating previous evidence for an East Gondwanan faunal province in the Middle Cambrian.

    Nyckelord
    Cambrian; Brachiopods; Trilobites; Small Shelly Fossils; Biostratigraphy; Palaeobiogeography
    Nationell ämneskategori
    Geologi
    Forskningsämne
    Geovetenskap med inriktning mot historisk geologi och paleontologi
    Identifikatorer
    urn:nbn:se:uu:diva-252128 (URN)10.1080/11035897.2015.1094510 (DOI)000381491500002 ()
    Externt samarbete:
    Projekt
    The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
    Forskningsfinansiär
    Vetenskapsrådet, VR 2009-4395, 2012-1658.
    Anmärkning

    Currently in press.

    Tillgänglig från: 2015-05-02 Skapad: 2015-05-02 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
    2. Description of camenellan tommotiids from the Early Cambrian of the Transantarctic Mountains, Antarctica
    Öppna denna publikation i ny flik eller fönster >>Description of camenellan tommotiids from the Early Cambrian of the Transantarctic Mountains, Antarctica
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    A collection of camenellan tommotiid sclerites from the Transantarctic Mountains have been re-examined. New data shows that Dailyatia sp. A is found alongside Dailyatia odyssei Evans and Rowell 1990 in the Early Cambrian Shackleton Limestone, as in the Arrowie Basin of Australia. A further examination of Shackleton Limestone sclerites, similar to others previously described as Kennardia sp. A and Kennardia sp. B, suggests that the Shackleton Limestone also contains a further species of camenellan. A further examination of the detail of ornamentation and gross morphology ofthese sclerites suggests that they are more likely to be a further species of Dailyatia, rather than Kennardia. A new species of Dailyatia is also reported from the Early Cambrian "Schneider Hills Limestone" formation of the Argentina Range. No overlap is found in sclerite morphologies between the Botomian-aged Schneider Hills and the temporally equivalent Shackleton Limestone, indicating a spatial influence on the distribution of tommotiids in the Cambrian of Antarctica.

    Nyckelord
    Cambrian; Tommotiids; Dailyatia; Small Shelly Fossils; Early Cambrian; Paleobiogeography; Antarctica
    Nationell ämneskategori
    Geologi
    Forskningsämne
    Geovetenskap med inriktning mot historisk geologi och paleontologi
    Identifikatorer
    urn:nbn:se:uu:diva-252130 (URN)
    Projekt
    The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
    Forskningsfinansiär
    Vetenskapsrådet, VR 2009-4395, 2012-1658.
    Anmärkning

    In press.

    Tillgänglig från: 2015-05-02 Skapad: 2015-05-02 Senast uppdaterad: 2015-05-20
    3. Discovery of the youngest known tommotiid from the middle Cambrian (Drumian) Nelson Limestone of Antarctica
    Öppna denna publikation i ny flik eller fönster >>Discovery of the youngest known tommotiid from the middle Cambrian (Drumian) Nelson Limestone of Antarctica
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    A potential fragmentary tommotiid sclerite is described from the Nelson Limestone Formation of the Pensacola Mountains, Antarctica (Drumian in age). The sclerite bears similarities to other early Cambrian camenellan tommotiids. The sclerite is bilaterally symmetrical and may belong toa new genus. The find suggests that tommotiids may range into the Drumian Stage.

    Nyckelord
    Cambrian; Tommotiids; Small Shelly Fossils; Middle Cambrian; Palaeobiogeography; Antarctica
    Nationell ämneskategori
    Geologi
    Forskningsämne
    Geovetenskap med inriktning mot historisk geologi och paleontologi
    Identifikatorer
    urn:nbn:se:uu:diva-252129 (URN)
    Projekt
    The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
    Forskningsfinansiär
    Vetenskapsrådet, VR 2009-4395, 2012-1658.
    Anmärkning

    In press

    Tillgänglig från: 2015-05-02 Skapad: 2015-05-02 Senast uppdaterad: 2015-05-20
  • 59. Bauert, Heikki
    et al.
    Isozaki, Yukio
    Holmer, Lars Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Aoki, Kazumasa
    Sakata, Shuhei
    Hirata, Takafumi
    New U-Pb zircon ages of the Sandbian (Upper Ordovician) "Big K-bentonite" in Baltoscandia (Estonia and Sweden) by LA-ICPMS2014Ingår i: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 136, nr 1, s. 30-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Oscillatory-zoned euhedral single zircons from the upper Sandbian (Upper Ordovician) Kinnekulle K-bentonite exposed in a hillock at Paaskula in Estonia and at the type locality on Mt Kinnekulle in Sweden were dated in a grain-by-grain manner by laser ablation-inductively coupled plasma mass spectrometer. The U-Pb (weighed mean) ages of the 25 grains from Mt Kinnekulle and 24 grains from Paaskula are 453.4 +/- 6.6 and 454.9 +/- 4.9Ma, respectively. This study provides the first ca. 454Ma (late Sandbian) age for the Ordovician K-bentonite in northern Estonia and confirmed its correlation with the type Kinnekulle bed across the Baltic Sea.

  • 60.
    Bazzi, Mohamad
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Kear, Benjamin P.
    Uppsala universitet, Enheten för musik och museer, Evolutionsmuseet.
    Blom, Henning
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
    Ahlberg, Per
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
    Campione, Nicolas E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW 2351, Australia.
    Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction2018Ingår i: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 28, nr 16, s. 2607-2615Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Cretaceous-Palaeogene (K-Pg) mass extinction profoundly altered vertebrate ecosystems and prompted the radiation of many extant clades [1, 2]. Sharks (Selachimorpha) were one of the few larger-bodied marine predators that survived the K-Pg event and are represented by an almost-continuous dental fossil record. However, the precise dynamics of their transition through this interval remain uncertain [3]. Here, we apply 2D geometric morphometrics to reconstruct global and regional dental morphospace variation among Lamniformes (Mackerel sharks) and Carch-arhiniformes (Ground sharks). These clades are prevalent predators in today's oceans, and were geographically widespread during the late Cretaceous-early Palaeogene. Our results reveal a decoupling of morphological disparity and taxonomic richness. Indeed, shark disparity was nearly static across the K-Pg extinction, in contrast to abrupt declines among other higher-trophic-level marine predators [4, 5]. Nevertheless, specific patterns indicate that an asymmetric extinction occurred among lamniforms possessing lowcrowned/triangular teeth and that a subsequent proliferation of carcharhiniforms with similar tooth morphologies took place during the early Paleocene. This compositional shift in post-Mesozoic shark lineages hints at a profound and persistent K-Pg signature evident in the heterogeneity of modern shark communities. Moreover, such wholesale lineage turnover coincided with the loss of many cephalopod [6] and pelagic amniote [5] groups, as well as the explosive radiation of middle trophic-level teleost fishes [1]. We hypothesize that a combination of prey availability and post-extinction trophic cascades favored extant shark antecedents and laid the foundation for their extensive diversification later in the Cenozoic [7-10].

  • 61. Bell, Phil R.
    et al.
    Campione, Nicolàs E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi.
    Taphonomy of the Danek Bonebed: a monodominant Edmontosaurus (Hadrosauridae) bonebed from the Horseshoe Canyon Formation, Alberta2014Ingår i: Canadian journal of earth sciences (Print), ISSN 0008-4077, E-ISSN 1480-3313, Vol. 51, nr 11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Danek Bonebed (Horsethief Member, Horseshoe Canyon Formation, Late Campanian) is dominated by the remains of at least 12 Edmontosaurus regalis. Skeletal remains of a tyrannosaurid and ceratopsid are also known. The predominantly disarticulated remains were interred on a periodically inundated floodplain and, although the cause of death is unknown, a sudden, catastrophic death explains the demographic spread, faunal diversity, rare greenstick fractures, and homogeneous weathering/abrasion categories of the assemblage. The Danek Bonebed shares a similar taphonomic signature to the Liscomb Bonebed (Prince Creek Formation, Alaska), but it is unique among all other described hadrosaurid bonebeds in the unusually high proportion of bite-marked bones (similar to 30%), suggesting scavenging played a major role in the reworking of the assemblage. The highest frequency of bite marks is found on small, often unidentifiable (and commonly ignored) bone fragments, underscoring the role that such fragments can play in taphonomic interpretation. Finally, the recognition of E. regalis from central Alberta is an important datum linking contemporaneous occurrences in southern Alberta with slightly older records of this species from the Wapiti Formation in northwestern Alberta.

  • 62.
    Belli, Phil R.
    et al.
    Univ New England, Armidale, NSW 2351, Australia..
    Campione, Nicolas E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Persons, W. Scott
    Univ Alberta, Edmonton, AB T6E 4S6, Canada..
    Currie, Philip J.
    Univ Alberta, Edmonton, AB T6E 4S6, Canada..
    Larson, Peter L.
    Geol Res Inc, Black Hills Inst, Hill City, SD 57745 USA..
    Tanke, Darren H.
    Royal Tyrrell Museum Palaeontol, Drumheller, AB, Canada..
    Bakker, Robert T.
    Houston Museum Nat Sci, Houston, TX 77030 USA..
    Tyrannosauroid integument reveals conflicting patterns of gigantism and feather evolution2017Ingår i: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 13, nr 6, artikel-id 20170092Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including Tyrannosaurus rex, were extensively feathered. We describe fossil integument from Tyrannosaurus and other tyrannosaurids (Albertosaurus, Daspletosaurus, Gorgosaurus and Tarbosaurus), confirming that these large-bodied forms possessed scaly, reptilian-like skin. Body size evolution in tyrannosauroids reveals two independent occurrences of gigantism; specifically, the large sizes in Yutyrannus and tyrannosaurids were independently derived. These new findings demonstrate that extensive feather coverings observed in some early tyrannosauroids were lost by the Albian, basal to Tyrannosauridae. This loss is unrelated to palaeoclimate but possibly tied to the evolution of gigantism, although other mechanisms exist.

  • 63.
    Bennett, K.D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Continuing the debate on the role of Quaternary environmental change for macroevolution2004Ingår i: Philosophical Transactions of the Royal Society Series B, Vol. 359, s. 295-303Artikel i tidskrift (Refereegranskat)
  • 64.
    Bennett, Keith
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Interpretation of pollen data from southern Chile and climate change at the last glacial/interglacial transition2003Konferensbidrag (Övrig (populärvetenskap, debatt, mm))
  • 65.
    Bennett, Keith
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Paleobiologi.
    Out of Australasia?2004Ingår i: Quaternary Australasia, Vol. 22, nr 1, s. 5-7Artikel i tidskrift (Övrigt vetenskapligt)
  • 66.
    Bennett, Keith D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Comment on "Sedimentary DNA from a submerged site reveals wheat in the British Isles 8000 years ago"2015Ingår i: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 349, nr 6245Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Smith et al. (Reports, 27 February 2015, p. 998) identify wheat DNA from an 8000-calendar-years-before-the-present archaeological site in southern England and conclude that wheat was traded to Britain 2000 years before the arrival of agriculture. The DNA samples are not dated, either directly or from circumstantial evidence, so there is no chronological evidence to support the claim.

  • 67.
    Bennett, Keith D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    The chaos theory of evolution2010Ingår i: New scientist (1971), ISSN 0262-4079, Vol. 208, s. 28-31Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 68.
    Bennett, Keith D.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Bhagwat, S. A.
    Willis, K. J.
    Neotropical refugia2012Ingår i: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 22, nr 11, s. 1207-1214Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Patterns of endemism in the Neotropics have been explained by restriction of forest to 'refugia' in arid cold-stages of the Quaternary (Haffer J (1969) Speciation in Amazonian forest birds. Science 165: 131-137). The palaeoecological record, however, shows no such forest contraction. We review palaeoecological and phylogenetic data on the response of Neotropical taxa and communities to climatic changes of the Cenozoic. Solar insolation varies over this period with latitude and geography, including shifts in opposite directions between high and low latitudes. In the Neotropics, distribution and abundance patterns originate on a wide range of timescales through the Cenozoic, down to the currently dominant precession forcing (20 kyr). In contrast, distributions and abundances at higher latitudes are controlled by obliquity forcing (40 kyr). The patterns observed by Haffer (1969) are likely derived from pre-Quaternary radiations and are not inconsistent with palaeoecological findings of continuous forest cover in major areas of the Neotropics during the Quaternary. The relative proportions of speciation processes have changed through time between predominantly sympatric to predominantly allopatric depending on the prevailing characteristics of orbitally forced climatic changes. Behaviour of Neotropical organisms and ecosystems on long timescales may be influenced much more by precessional forcing than by the obliquity forcing that controls high-latitude climate change and glaciations.

  • 69.
    Bennett, Keith D.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik.
    Parducci, Laura
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik.
    DNA from pollen: principles and potential2006Ingår i: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 16, nr 8, s. 1031-1034Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper describes our recent extraction of ancient DNA (aDNA) from Holocene pollen and discusses the potential of the technique for elucidating timescales of evolutionary change. We show that plastid DNA is recoverable and usable from pollen grains of Scots pine Pinus sylvestris from 10 ka and 100 years ago. Comparison of the ancient sequences with modern sequences, obtained from an extant population, establish a first genetic link between modern and fossil samples of Scots pine, providing a genetic continuity through time. One common haplotype is present in each of the three periods investigated, suggesting that it persisted near the lake throughout the postglacial. The retrieval of aDNA from pollen has major implications for palaeoecology by allowing (i) investigation of population-level dynamics in time and space, and (ii) tracing ancestry of populations and developing phylogenetic trees that include extinct as well as extant taxa. The method should work over the last glacial oscillation, thus giving access to ancestry of populations over a crucial period of time for the understanding of the relationship between speciation and climate change.

  • 70.
    Bennett, Keith
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Paleobiologi.
    Hicks, Sheila
    Numerical analysis of surface and fossil pollen spectra from northern Fennoscandia2005Ingår i: Journal of Biogeography, Vol. 32, s. 407-423Artikel i tidskrift (Refereegranskat)
  • 71. Benson, Roger B. J.
    et al.
    Campione, Nicolàs E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi.
    Carrano, Matthew T.
    Mannion, Philip D.
    Sullivan, Corwin
    Upchurch, Paul
    Evans, David C.
    Rates of Dinosaur Body Mass Evolution Indicate 170 Million Years of Sustained Ecological Innovation on the Avian Stem Lineage2014Ingår i: PLoS biology, ISSN 1544-9173, E-ISSN 1545-7885, Vol. 12, nr 5, s. e1001853-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Large-scale adaptive radiations might explain the runaway success of a minority of extant vertebrate clades. This hypothesis predicts, among other things, rapid rates of morphological evolution during the early history of major groups, as lineages invade disparate ecological niches. However, few studies of adaptive radiation have included deep time data, so the links between extant diversity and major extinct radiations are unclear. The intensively studied Mesozoic dinosaur record provides a model system for such investigation, representing an ecologically diverse group that dominated terrestrial ecosystems for 170 million years. Furthermore, with 10,000 species, extant dinosaurs (birds) are the most speciose living tetrapod clade. We assembled composite trees of 614-622 Mesozoic dinosaurs/birds, and a comprehensive body mass dataset using the scaling relationship of limb bone robustness. Maximum-likelihood modelling and the node height test reveal rapid evolutionary rates and a predominance of rapid shifts among size classes in early (Triassic) dinosaurs. This indicates an early burst niche-filling pattern and contrasts with previous studies that favoured gradualistic rates. Subsequently, rates declined in most lineages, which rarely exploited new ecological niches. However, feathered maniraptoran dinosaurs (including Mesozoic birds) sustained rapid evolution from at least the Middle Jurassic, suggesting that these taxa evaded the effects of niche saturation. This indicates that a long evolutionary history of continuing ecological innovation paved the way for a second great radiation of dinosaurs, in birds. We therefore demonstrate links between the predominantly extinct deep time adaptive radiation of non-avian dinosaurs and the phenomenal diversification of birds, via continuing rapid rates of evolution along the phylogenetic stem lineage. This raises the possibility that the uneven distribution of biodiversity results not just from large-scale extrapolation of the process of adaptive radiation in a few extant clades, but also from the maintenance of evolvability on vast time scales across the history of life, in key lineages.

  • 72.
    Benson, Roger B. J.
    et al.
    Univ Oxford, Dept Earth Sci, S Parks Rd, Oxford OX2 3AN, England..
    Hunt, Gene
    Smithsonian Inst, Natl Museum Nat Hist, Dept Paleobiol, POB 37012,MRC 121, Washington, DC 20560 USA..
    Carrano, Matthew T.
    Smithsonian Inst, Natl Museum Nat Hist, Dept Paleobiol, POB 37012,MRC 121, Washington, DC 20560 USA..
    Campione, Nicolas E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Cope's rule and the adaptive landscape of dinosaur body size evolution2018Ingår i: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 61, nr 1, s. 13-48Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    The largest known dinosaurs weighed at least 20million times as much as the smallest, indicating exceptional phenotypic divergence. Previous studies have focused on extreme giant sizes, tests of Cope's rule, and miniaturization on the line leading to birds. We use non-uniform macroevolutionary models based on Ornstein-Uhlenbeck and trend processes to unify these observations, asking: what patterns of evolutionary rates, directionality and constraint explain the diversification of dinosaur body mass? We find that dinosaur evolution is constrained by attraction to discrete body size optima that undergo rare, but abrupt, evolutionary shifts. This model explains both the rarity of multi-lineage directional trends, and the occurrence of abrupt directional excursions during the origins of groups such as tiny pygostylian birds and giant sauropods. Most expansion of trait space results from rare, constraint-breaking innovations in just a small number of lineages. These lineages shifted rapidly into novel regions of trait space, occasionally to small sizes, but most often to large or giant sizes. As with Cenozoic mammals, intermediate body sizes were typically attained only transiently by lineages on a trajectory from small to large size. This demonstrates that bimodality in the macroevolutionary adaptive landscape for land vertebrates has existed for more than 200million years.

  • 73.
    BERG-MADSEN, Vivianne
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Museer m.m., Evolutionsmuseet. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    PEEL, John S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    A TERGOMYAN MOLLUSC FROM THE UPPER CAMBRIAN OF WALES1994Ingår i: PALAEONTOLOGY, ISSN 0031-0239, Vol. 37, s. 505-512Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Bellerophon cambriensis from the Upper Cambrian of North Wales is redescribed as the type species of the new genus Telamocornu. Unlike most similarly coiled molluscs of this age, apertural sinuses are present which permit both a functional morphological i

  • 74.
    Betts, Marissa J.
    et al.
    Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW, Australia; Northwest Univ, Early Life Inst, Xian, Shaanxi, Peoples R China; Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Shaanxi, Peoples R China.
    Claybourn, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Macquarie Univ, Dept Biol Sci, Sydney, NSW, Australia.
    Brock, Glenn A.
    Macquarie Univ, Dept Biol Sci, Sydney, NSW, Australia.
    Jago, James B.
    Univ South Australia, Sch Nat & Built Environm, Adelaide, SA, Australia.
    Skovsted, Christian B.
    Swedish Museum Nat Hist, Dept Palaeobiol, Stockholm, Sweden.
    Paterson, John R.
    Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW, Australia.
    Shelly fossils from the lower Cambrian White Point Conglomerate, Kangaroo Island, South Australia2019Ingår i: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 64, nr 3, s. 489-522Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The lower Cambrian (Series 2) White Point Conglomerate (WPC) on Kangaroo Island, South Australia contains exotic clasts representing a diverse array of lithologies, including metamorphics, chert, sandstone, and abundant carbonates, notably archaeocyath-rich bioclastic limestone. Acetic acid digestion of the WPC bioclastic limestone clasts reveals a diverse shelly fauna. This assemblage includes abundant organophosphatic brachiopods such as Cordatia erinae Brock and Claybourn gen. et sp. nov., Curdus pararaensis, Eodicellomus elkaniformiis, Eohadrotreta sp. cf. E. zhenbaensis, Eoobolus sp., Kyrshabaktella davidii, and Schizopholis yorkensis. Additional shelly taxa include the solenopleurid trilobite Trachoparia? sp., the tommotiids Dailyatia odyssei, Dailyatia decobruta Betts sp. nov., Kelanella sp., and Lapworthella fasciculata, spines of the bradoriid arthropod Mongolitubulus squamifer, and several problematica, such as Stoibostrombus crenulatus and a variety of tubular forms. The upper age limit for the WPC is constrained by biostratigraphic data from the overlying Marsden Sandstone and Emu Bay Shale, which are no younger than the Pararaia janeae Trilobite Zone (Cambrian Series 2, Stage 4). The shelly fossil assemblage from the WPC limestone clasts indicates an upper Dailyatia odyssei Zone (= Pararaia tatei to lower P. janeae trilobite zones), equivalent to the Atdabanian–early Botoman of the Siberian scheme. This contrasts with the previously suggested late Botoman age for the limestone clasts, based on the diverse archaeocyath assemblage. The minor age difference between the WPC and its fossiliferous limestone clasts suggests relatively rapid reworking of biohermal buildups during tectonically-active phases of deposition in the Stansbury Basin.

  • 75. Bindler, R
    et al.
    Martíñez-Cortizas, A
    Blaauw, M
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Comment on "Atmospheric mercury accumulation rates between 5900 and 800 calibrated years BP in the High Arctic of Canada recorded by peat hummocks"2005Ingår i: Environmental Science and Technology, Vol. 39, s. 908-909Artikel i tidskrift (Refereegranskat)
  • 76.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Christen, JA
    Radiocarbon peat chronologies and environmental change2005Ingår i: Applied Statistics, Vol. 54, s. 805-816Artikel i tidskrift (Refereegranskat)
  • 77.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Christen, JA
    The problems of radiocarbon dating2005Ingår i: Science, Vol. 308, s. 1551-1553Artikel i tidskrift (Refereegranskat)
  • 78.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Heuvelink, GBM
    Mauquoy, D
    van der Plicht, J
    van Geel, B
    A numerical approach to C-14 wiggle-match dating of organic deposits: best fits and confidence intervals2003Ingår i: Quaternary Science Reviews, Vol. 22, s. 1485-1500Artikel i tidskrift (Refereegranskat)
  • 79.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    van der Plicht, J
    van Geel, B
    Radiocarbon dating of bulk peat samples from raised bogs: non-existence of a previously reported reservoir effect?2004Ingår i: Quaternary Science Reviews, Vol. 23, s. 1537-1542Artikel i tidskrift (Refereegranskat)
  • 80.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    van Geel, B
    Mauquoy, D
    van der Plicht, J
    Radiocarbon wiggle-match dating of peat deposits: advantages and limitations2004Ingår i: Journal of Quaternary Science, Vol. 19, s. 177-181Artikel i tidskrift (Refereegranskat)
  • 81.
    Blaauw, M
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    van Geel, B
    van der Plicht, J
    Solar forcing of climate change during the mid-Holocene: indications from raised bogs in the Netherlands2004Ingår i: The Holocene, Vol. 14, s. 35-44Artikel i tidskrift (Refereegranskat)
  • 82. Blaauw, Maarten
    et al.
    Bennett, Keith D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Christen, J. Andres
    Random walk simulations of fossil proxy data2010Ingår i: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 20, nr 4, s. 645-649Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A wealth of palaeoecological studies (e.g. pollen, diatoms, chironomids and macrofossils from deposits such as lakes or bogs) have revealed major as well as more subtle ecosystem changes over decadal to multimillennial timescales. Such ecosystem changes are usually assumed to have been forced by specific environmental changes. Here, we test if the observed changes in palaeoecological records may be reproduced by random simulations, and we find that simple procedures generate abrupt events, long-term trends, quasi-cyclic behaviour, extinctions and immigrations. Our results highlight the importance of replicated and multiproxy data for reliable reconstructions of past climate and environmental changes.

  • 83.
    Blaauw, Maarten
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Christen, Andres
    Hall, Valerie
    van der Plicht, Johannes
    A Bayesian framework for age-modelling of radiocarbon-dated peat deposits: case studies from the Netherlands2007Ingår i: Radiocarbon, ISSN 0033-8222, E-ISSN 1945-5755, Vol. 49, nr 2, s. 357-367Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Recently, Bayesian statistical software has been developed for age-depth modeling (“wiggle-match dating”) ofsequences of densely spaced radiocarbon dates from peat cores. The method is described in non-statistical terms, and is com-pared with an alternative method of chronological ordering of 14C dates. Case studies include the dating of the start of agri-culture in the northeastern part of the Netherlands, and of a possible Hekla-3 tephra layer in the same country. We discussfuture enhancements in Bayesian age modeling.

  • 84.
    Blaauw, Maarten
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Christen, Andres
    Mauquoy, Dmitri
    van der Plicht, Johannes
    Bennett, Keith
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Testing the timing of radiocarbon-dated events between proxy archives2007Ingår i: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 17, nr 2, s. 283-288Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    For interpreting past changes on a regional or global scale, the timings of proxy-inferred events are usually aligned with data from other locations. However, too often chronological uncertainties are ignored in proxy diagrams and multisite comparisons, making it possible for researchers to fall into the trap of sucking separate events into one illusionary event (or vice versa). Here we largely solve this ‘suck in and smear syndrome’ for radiocarbon (14C) dated sequences. In a Bayesian framework, millions of plausible age-models are constructed to quantify the chronological uncertainties within and between proxy archives. We test the technique on replicated high-resolution 14C-dated peat cores deposited during the ‘Little Ice Age’ (c. AD 1400-1900), a period characterized by abrupt climate changes and severe 14C calibration problems. Owing to internal variability in proxy data and uncertainties in age-models, these (and possibly many more) archives are not consistent in recording decadal climate change. Through explicit statistical tests of palaeoenvironmental hypotheses, we can move forward to systematic interpretations of proxy data. However, chronological uncertainties of non-annually resolved palaeoclimate records are too large for answering decadal timescale questions.

  • 85.
    Blaauw, Maarten
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Paleobiologi.
    Christen, J. Andres
    van der Plicht, J.
    Bennett, Keith
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Paleobiologi.
    21st century suck-in or smear: testing the timing of events between archives2006Ingår i: PAGES News, Vol. 14, nr 3, s. 15-16Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 86.
    Blaauw, Maarten
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Heuvelink, Gerald B. M.
    Mauquoy, Dmitri
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    van der Plicht, Johannes
    van Geel, Bas
    A numerical approach to 14C wiggle-match dating of organic deposits: best fits and confidence intervals2003Ingår i: Quaternary Science Reviews, Vol. 22, nr 14, s. 1485-1500Artikel i tidskrift (Refereegranskat)
  • 87.
    Blaauw, Maarten
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Wohlfarth, Barbara
    Christen, J Andrés
    Ampel, Linda
    Veres, Daniel
    Hughen, Konrad A
    Preusser, Frank
    Svensson, Anders
    Were last glacial climate events simultaneous between Greenland and western Europe?2008Ingår i: Climate of the Past Discussions, ISSN 1814-9359, Vol. 4, s. 1203-1217Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    During the last glacial period, several large abrupt climate fluctuations took place on the Greenland ice cap and elsewhere. Often these Dansgaard/Oeschger events are assumed to have been synchronous, and then used as tie-points to link chronologies between the proxy archives. However, if temporally separate events are lumped into one illusionary event, climatic interpretations of the tuned events will obviously be flawed. Here, we compare Dansgaard/Oeschger-type events in a well-dated record from south-eastern France with those in Greenland ice cores. Instead of assuming simultaneous climate events between both archives, we keep their age models independent. Even these well-dated archives possess large chronological uncertainties, that prevent us from inferring synchronous climate events at decadal to multi-centennial time scales. If possible, tuning of proxy archives should be avoided.

  • 88. Black, Karen H.
    et al.
    Travouillon, Kenny J.
    Den Boer, Wendy
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Kear, Benjamin P.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Cooke, Bernard N.
    Archer, Michael
    A New Species of the Basal "Kangaroo'' Balbaroo and a Re-Evaluation of Stem Macropodiform Interrelationships2014Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, nr 11, s. e112705-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Exceptionally well-preserved skulls and postcranial elements of a new species of the plesiomorphic stem macropodiform Balbaroo have been recovered from middle Miocene freshwater limestone deposits in the Riversleigh World Heritage Area of northwestern Queensland, Australia. This constitutes the richest intraspecific sample for any currently known basal "kangaroo'', and, along with additional material referred to Balbaroo fangaroo, provides new insights into structural variability within the most prolific archaic macropodiform clade - Balbaridae. Qualitative and metric evaluations of taxonomic boundaries demonstrate that the previously distinct species Nambaroo bullockensis is a junior synonym of B. camfieldensis. Furthermore, coupled Maximum Parsimony and Bayesian phylogenetic analyses reveal that our new Balbaroo remains represent the most derived member of the Balbaroo lineage, and are closely related to the middle Miocene B. camfieldensis, which like most named balbarid species is identifiable only from isolated jaws. The postcranial elements of Balbaroo concur with earlier finds of the stratigraphically oldest balbarid skeleton, Nambaroo gillespieae, and suggest that quadrupedal progression was a primary gait mode as opposed to bipedal saltation. All Balbaroo spp. have low-crowned bilophodont molars, which are typical for browsing herbivores inhabiting the densely forested environments envisaged for middle Miocene northeastern Australia.

  • 89.
    Blaj, Teodora
    et al.
    Department of Geology and Geochemistry, Stockholm University, Sweden .
    Henderiks, Jorijntje
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Young, Jeremy R.
    Palaeontology Department, The Natural History Museum London, UK .
    Rehnberg, Emil
    Department of Mathematical Statistics, Stockholm University, Sweden .
    The Oligocene nannolith Sphenolithus evolutionary lineage:  morphometrical insights from the palaeo-equatorial Pacific Ocean2010Ingår i: Journal of Micropalaeontology, ISSN 0262-821X, E-ISSN 2041-4978, Vol. 29, s. 17-35Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Changes in morphology within the biostratigraphically important Oligocene nannofossil lineage, Sphenolithus predistentus, S. distentus and S. ciperoensis were investigated in carbonate sediments from the palaeo-equatorial Pacific Ocean Site 1218 in order to determine the nature of this evolutionary lineage. Using differences in their morphology and stratigraphical ranges, the aim of this study was to determine whether these taxa represent an anagenetic evolutionary lineage or a set of discrete species with overlapping stratigraphical ranges. A total of 1215 specimens from 12 samples were analysed morphometrically and the basal ratio, i.e. the ratio between the basal width and proximal cycle height, was identified as a key parameter for the study of this lineage. We conclude that S. distentus and S. predistentus are intergradational species forming an anagenetic lineage but that S. ciperoensis is a discrete species which evolved relatively abruptly in the Late Oligocene.

  • 90. Blockley, Simon
    et al.
    Blaauw, Maarten
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Bronk Ramsey, Christopher
    van der Plicht, Johannes
    Building and testing age models for radiocarbon dates in Lateglacial and Early Holocene sediments2007Ingår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 26, nr 15-16, s. 1915-1926Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The growing importance of understanding past abrupt climate variability at a regional and global scale has led to the realisation that independent chronologies of past environmental change need to be compared between various archives. This has in turn led to attempts at significant improvements in the required precision at which records can be dated. Radiocarbon dating is still the most prominent method for dating organic material from terrestrial and marine archives, and as such many of the recent developments in improving precision have been aimed at this technique. These include: (1) selection of the most suitable datable fractions within a record, (2) the development of better calibration curves, and (3) more precise age modelling techniques. While much attention has been focussed on the first two items, testing the possibilities of the relatively new age modelling approaches has not received much attention. Here, we test the potential for methods designed to significantly improve precision in radiocarbon-based age models, wiggle match dating and various forms of Bayesian analyses. We demonstrate that while all of the methods can perform very well, in some scenarios, caution must be taken when applying them. It appears that an integrated approach is required in real life dating situations where more than one model is applied, with strict error calculation, and with the integration of radiocarbon data with sedimentological analyses of site formation processes.

  • 91.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Book review: Encyclopedia of Paleoherpetology, Part 3B: Stereospondyli. Schoch R. R. & Milner A. R.2002Ingår i: The Palaeontological Association Newsletter, Vol. 49, s. 108-110Artikel, recension (Övrig (populärvetenskap, debatt, mm))
  • 92.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    How many four-legged fishes? The diversity and distribution of Ichthyostega.2001Ingår i: Palaeontological Association 45th Annual Meeting. Geological Musuem, University of Copenhagen., 2001, s. 4-Konferensbidrag (Refereegranskat)
  • 93.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    IGCP project 406:"Circum-Arctic Lower-Middle Palaeozoic Vertebrate Palaeontology and Biostratigraphy"- Preliminary results from the Greenland Working Group.1997Ingår i: Lundadagarna i Historisk Geologi och Paleontologi. Lund University, Lund., 1997, s. 4-Konferensbidrag (Refereegranskat)
  • 94.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    IGCP: Workshop1996Konferensbidrag (Refereegranskat)
  • 95.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Paedomorphism in the Late Devonian tetrapod Ichthyostega from East Greenland.2002Ingår i: Palaeontological Association 46th Annual Meeting, Cambridge, 2002, s. 84-85Konferensbidrag (Refereegranskat)
  • 96.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Silurian vertebrate remains from the Franklinian Basin, North Greenland1997Konferensbidrag (Refereegranskat)
  • 97.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Silurian vertebrate remains from the Franklinian Basin, North Greenland1996Ingår i: The James Hall Symposium: Second international symposium on the Silurian System., 1996, s. 33-Konferensbidrag (Refereegranskat)
  • 98.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Tetrapod diversity in the Late Devonian basin of East Greenland2002Ingår i: Geological Society of Australia, 2002, s. 19-20Konferensbidrag (Refereegranskat)
  • 99.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    The Dermal skeleton of Birkeniid anaspis: a clue to their evolution?2000Ingår i: 9th International Symposium, Early Vertebrates/Lower Vertebrates. Flagstaff, Arizona., 2000, s. 2-Konferensbidrag (Refereegranskat)
  • 100.
    Blom, H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi, Paleontologigruppen.
    Vertebrate remanis from the Chester Bjerg Formation (Late Silurian?), Hall Land, North Greenland.1995Ingår i: Lundadagarna i Historisk Geologi och Palaeontologi. Lund University, Lund., 1995, s. 5-Konferensbidrag (Refereegranskat)
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