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Willman, Sebastian, Docent
Publications (10 of 31) Show all publications
Slater, B., Willman, S., Budd, G. E. & Peel, J. S. (2018). Widespread preservation of small carbonaceous fossils (SCFs) in the early Cambrian of North Greenland. Geology, 46(2), 107-110
Open this publication in new window or tab >>Widespread preservation of small carbonaceous fossils (SCFs) in the early Cambrian of North Greenland
2018 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 46, no 2, p. 107-110Article in journal (Refereed) Published
Abstract [en]

The early Cambrian (ca. 518 Ma) Sirius Passet Lagerstätte of North Greenland is one of the most celebrated sites bearing fossils of soft-bodied organisms, and provides key insights into the Cambrian explosion of animal life. Unlike the younger Burgess Shale (508 Ma), the Sirius Passet biota does not preserve original carbonaceous material because of its history of metamorphic heating. Nearby sediments from within the same formation, however, have escaped the worst effects of thermal alteration. We report an entirely new diversity of metazoan remains preserved in a Burgess Shale–type fashion from sediments throughout the Buen Formation, in the form of small carbonaceous fossils (SCFs). The assemblages include the oldest known pterobranch hemichordates, diverse cuticular spines of scalidophoran worms, demineralized trilobite cuticle, bivalved arthropods (Spinospitella-like and Isoxys-like forms), protoconodonts, and a variety of less phylogenetically constrained metazoan and protistan forms. Together these SCFs capture exceptional microanatomical details of early Cambrian metazoans and offer new insights into taphonomic pathways at Sirius Passet and the nature of Burgess Shale–type preservation.

Keywords
Cambrian, small carbonaceous fossils, Burgess Shale-type preservation, Greenland
National Category
Geology Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-337294 (URN)10.1130/G39788.1 (DOI)000427093900005 ()
Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-05-18Bibliographically approved
Moczydlowska, M., Pease, V., Willman, S., Wickström, L. & Agić, H. (2017). A Tonian age for the Visingsö Group in Sweden constrained by detrital zircon dating and biochronology: implications for evolutionary events. Geological Magazine
Open this publication in new window or tab >>A Tonian age for the Visingsö Group in Sweden constrained by detrital zircon dating and biochronology: implications for evolutionary events
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2017 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081Article in journal (Refereed) Published
National Category
Earth and Related Environmental Sciences
Research subject
Historical Geology and Paleontology
Identifiers
urn:nbn:se:uu:diva-337293 (URN)10.1017/S0016756817000085 (DOI)
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2017-12-21
Willman, S. & Moczydlowska, M. (2011). Acritarchs in the Ediacaran of Australia — Local or global significance?: Evidence from the Lake Maurice West 1 drillcore. Review of Palaeobotany and Palynology, 1-2(166), 12-28
Open this publication in new window or tab >>Acritarchs in the Ediacaran of Australia — Local or global significance?: Evidence from the Lake Maurice West 1 drillcore
2011 (English)In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 1-2, no 166, p. 12-28Article in journal (Refereed) Published
Abstract [en]

The Lake Maurice West 1 drillhole is located in the Officer Basin in South Australia and penetrates a siliciclastic rock succession of Ediacaran age (ca 635–542 Ma). Within this succession well-preserved organic-walled microfossils called acritarchs have been recovered from the Dey Dey Mudstone and Karlaya Limestone, which constitutes a major part of the Ungoolya Group. The assemblage consists of biostratigraphically useful acanthomorphic acritarchs in addition to a diverse assemblage of unornamented leiospheres, filamentous microbiota and some undetermined taxa. Here we describe eight acanthomorphic taxa belonging to three distinctive Ediacaran genera (Cavaspina, Ceratosphaeridium and Tanarium), of which one is described as a new species (Cavaspina amplitudinis sp. nov.). Similar acanthomorphic assemblages are known from Ediacaran strata worldwide and biostratigraphic subdivision of the system based on the occurrence of cosmopolitan taxa is possible in Australia, China, Siberia and Baltica (East European Platform), and perhaps in other areas. The Lake Maurice West 1 microfossil assemblage adds to the growing record of the Ediacaran acritarchs and supports a biostratigraphic scheme for the Ediacaran System at a global scale.

Keywords
acritarchs, Ediacaran, biostratigraphy, Neoproterozoic, Australia
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-157148 (URN)10.1016/j.revpalbo.2011.04.005 (DOI)000293317400002 ()
Available from: 2011-08-17 Created: 2011-08-17 Last updated: 2017-12-08Bibliographically approved
Budd, G. E., Meidla, T. & Willman, S. (2011). Fossils & rocks: geotourism in the central Baltic. Tallinn: NGO Geoguide Baltoscandia
Open this publication in new window or tab >>Fossils & rocks: geotourism in the central Baltic
2011 (English)Book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Tallinn: NGO Geoguide Baltoscandia, 2011. p. 80
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-157150 (URN)978-9985-9973-6-9 (ISBN)
Projects
Geoislands -Fostering geotourism on central Baltic islands
Available from: 2011-08-17 Created: 2011-08-17 Last updated: 2017-02-01Bibliographically approved
Tuuling, I., Bauert, H., Willman, S. & Budd, G. (2011). The Baltic Sea: Geology and geotourism highlights. Tallinn: NGO Geoguide Baltoscandia
Open this publication in new window or tab >>The Baltic Sea: Geology and geotourism highlights
2011 (English)Book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Tallinn: NGO Geoguide Baltoscandia, 2011. p. 80
National Category
Geology Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-165058 (URN)978-9985-9973-8-3 (ISBN)
Projects
Fostering geotourism on central baltic islands
Available from: 2012-01-02 Created: 2012-01-02 Last updated: 2017-02-01Bibliographically approved
Willman, S. & Cohen, P. (2011). Ultrastructural Approaches to the Microfossil Record: Assessing Biological Affinities by Use of Transmission Electron Microscopy. In: Marc Laflamme, James D. Schiffbauer and Stephen Q. Dornbos (Ed.), Quantifying the Evolution of Early Life: Numerical Approaches to the Evaluation of Fossils and Ancient Ecosystems (pp. 301-320). Dordrecht Heidelberg London New York: Springer
Open this publication in new window or tab >>Ultrastructural Approaches to the Microfossil Record: Assessing Biological Affinities by Use of Transmission Electron Microscopy
2011 (English)In: Quantifying the Evolution of Early Life: Numerical Approaches to the Evaluation of Fossils and Ancient Ecosystems / [ed] Marc Laflamme, James D. Schiffbauer and Stephen Q. Dornbos, Dordrecht Heidelberg London New York: Springer , 2011, p. 301-320Chapter in book (Refereed)
Abstract [en]

One of the major technological advances in biological research was the invention and development of the transmission electron microscope, which enables high resolution and high magnification studies of cross-sections of specimens. As such, it has proved to be a useful tool to describe ultrastructural features of taxonomic and phylogenetic importance in modern organisms. Here we discuss how to extend the use of transmission electron microscopy (TEM) to the fossil record, with emphasis on acritarchs (organic-walled microfossils of unknown affinity). Microfossils are traditionally studied by use of transmitted light microscopy, a method that reveals details of external morphology only. TEM however, gives an additional level of detail and reveals structures that can greatly aid in interpretation of taxonomic affinity, and thus can reveal further detail on the origination and diversification of myriad eukaryotic groups in the fossil record. In this chapter we describe the preparation procedure, show advantages and shortcomings of the technique, and discuss how to interpret the results from a geobiological perspective.

Place, publisher, year, edition, pages
Dordrecht Heidelberg London New York: Springer, 2011
Series
Topics in geobiology, ISSN 0275-0120 ; 36
Keywords
TEM, Ultrastructure, Preparation, Acritarch, Biological affinities
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-148172 (URN)10.1007/978-94-007-0680-4_12 (DOI)978-94-007-0679-8 (ISBN)978-94-007-0680-4 (ISBN)
Available from: 2011-03-02 Created: 2011-03-02 Last updated: 2011-03-03Bibliographically approved
Willman, S. (2010). Acritarch data from Australian Neoproterozoic successions. In: : . Paper presented at International Conference and Field Meeting on Precambrian Life, Time and Environment. February 2-9, 2010, Lucknow, India (pp. 47-48).
Open this publication in new window or tab >>Acritarch data from Australian Neoproterozoic successions
2010 (English)Conference paper, Published paper (Other academic)
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-136217 (URN)
Conference
International Conference and Field Meeting on Precambrian Life, Time and Environment. February 2-9, 2010, Lucknow, India
Available from: 2010-12-10 Created: 2010-12-10 Last updated: 2013-09-03Bibliographically approved
Willman, S., Bauert, H., Eliasson, S. & Thalheim, E. (2010). Generating Geoparks - a Central Baltic initiative. In: GEOPARKS: Learning from the Past – Building a Sustainable Future: Celebrating 10 Years of Innovation. Paper presented at Lesvos Island - Greece 1–5 October 2010.
Open this publication in new window or tab >>Generating Geoparks - a Central Baltic initiative
2010 (English)In: GEOPARKS: Learning from the Past – Building a Sustainable Future: Celebrating 10 Years of Innovation, 2010Conference paper, Published paper (Other academic)
Series
9th European Geoparks Conference 2010
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-136216 (URN)
Conference
Lesvos Island - Greece 1–5 October 2010
Available from: 2010-12-10 Created: 2010-12-10 Last updated: 2013-09-03Bibliographically approved
Eliason, S., Bassett, M. & Willman, S. (2010). Geotourism highlights of Gotland. Tallinn: NGO GEOGuide Baltoscandia
Open this publication in new window or tab >>Geotourism highlights of Gotland
2010 (English)Book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Tallinn: NGO GEOGuide Baltoscandia, 2010. p. 88
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-139287 (URN)978-9985-9973-4-5 (ISBN)
Available from: 2010-12-22 Created: 2010-12-22 Last updated: 2017-02-01Bibliographically approved
Puurmann, E., Ratas, U., Raukas, A., Bauert, H. & Willman, S. (2010). Geotourism highlights of the Estonian small islands. Tallinn: NGO Geoguide Baltoscandia
Open this publication in new window or tab >>Geotourism highlights of the Estonian small islands
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2010 (English)Book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Tallinn: NGO Geoguide Baltoscandia, 2010. p. 96
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-135458 (URN)978-9985-9973-3-8 (ISBN)
Available from: 2010-12-07 Created: 2010-12-07 Last updated: 2017-02-01Bibliographically approved
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