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Geology, stratigraphy, and fossil vertebrates of Gotland, Sweden: a review
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
2016 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The Silurian limestones of Gotland, Sweden, and their exceptionally well-preserved fossils have attracted the interest of scientists for more than 200 years. The sedimentary rocks represent approximately 10 million years of time, and were deposited in a shallow, equatorial inland sea named the Baltic Basin. The majority of the sediments are composed of reef-associated strata, but a general transition can be seen along the strike from shallow water in the northeast to deeper shelf environments in the southwest. The understanding of the stratigraphy and the geology of Gotland has greatly improved during the last decades. This research on Gotland has also led to the discovery of a series of stable isotope excursions and extinctions among several faunal groups. These events were probably linked to cycles in atmospheric and oceanic states, and three of them have been recognized globally. The Baltic Basin was also home to a variety of early vertebrates. The first fossil vertebrates from Gotland were reported in 1861, but the most extensive study of these early fishes was performed in the late 1900s. More recently it was shown that the vertebrates were also affected by one of the extinction events. This thesis is an extensive review of previous work and will form a geological basis for future studies. In this work, all previous reports of vertebrates have been gathered, reviewed, and the old samples have been placed in an updated stratigraphical framework. The scale taxonomy of Gotland vertebrates, including the Baltic acanthodians, has been evaluated and partly revised. Additionally, the depositional environments of the sampled areas have been investigated. Studying the vertebrates of Gotland is important for understanding the distribution of vertebrates through time and in different environments during the Silurian. Initial results indicate environmental preferences among vertebrates on both group and species-level, which may prove useful for testing the vertebrate biozonation developed for the Silurian.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2016. , s. 78
Nyckelord [en]
Silurian, Gotland geology, Baltic Basin, extinction events, isotope excursions, atmospheric and oceanic cycles, early vertebrates, scale taxonomy, environmental preferences, vertebrate biozonation.
Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Forskningsämne
Geovetenskap med inriktning mot historisk geologi och paleontologi
Identifikatorer
URN: urn:nbn:se:uu:diva-281659OAI: oai:DiVA.org:uu-281659DiVA, id: diva2:915063
Presentation
2016-04-27, EBC/9:2008, Norbyvägen 22, Uppsala, 10:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-12-15 Skapad: 2016-03-29 Senast uppdaterad: 2016-12-15Bibliografiskt granskad
Delarbeten
1. An updated stratigraphic and environmental framework for the distribution of Silurian vertebrates on Gotland
Öppna denna publikation i ny flik eller fönster >>An updated stratigraphic and environmental framework for the distribution of Silurian vertebrates on Gotland
2015 (Engelska)Ingår i: Estonian journal of earth sciences, ISSN 1736-4728, E-ISSN 1736-7557, Vol. 64, nr 1, s. 13-18Artikel i tidskrift (Refereegranskat) Published
Nyckelord
vertebrate distribution, stratigraphy, facies, Silurian events, Gotland, Sweden
Nationell ämneskategori
Utvecklingsbiologi Geovetenskap och miljövetenskap
Identifikatorer
urn:nbn:se:uu:diva-251824 (URN)10.3176/earth.2015.03 (DOI)000351327700004 ()
Tillgänglig från: 2015-04-27 Skapad: 2015-04-24 Senast uppdaterad: 2017-08-21
2. Vertebrate microremains from the upper Silurian Winnica Formation of the Holy Cross Mountains, Poland
Öppna denna publikation i ny flik eller fönster >>Vertebrate microremains from the upper Silurian Winnica Formation of the Holy Cross Mountains, Poland
Visa övriga...
2018 (Engelska)Ingår i: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 155, nr 7, s. 1523-1541Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Vertebrate microremains from the upper Silurian Winnica Formation in the Holy Cross Mountains, Poland are described from the Winnica and Rzepin sections. Both sites record the uppermost part of the Supianka Member, but represent different depositional environments. The Winnica samples come from a low-energy environment, while the Rzepin sample was taken from a high-energy, oolitic facies. Both sites contain thelodonts Thelodus parvidens, Thelodus trilobatus, an anaspid cf. Liivilepis and a number of acanthodian scales of 'nostolepid', poracanthodid and 'gomphonchid' types. Notable differences between the sites are the addition of the osteostracan Tahulaspis cf. ordinata, the thelodont Paralogania ludlowiensis and acanthodian scales identified as Nostolepis gracilis in the Rzepin section. Placing the vertebrate faunas within the vertebrate biozonation established for the Silurian proved difficult. The suggested late Ludlow age for the Supianka Member based on sequence stratigraphical and chemostratigraphical correlations cannot be definitely confirmed or refuted, but a late Ludfordian age seems the most plausible based on invertebrate and vertebrate faunas. The much lower abundance of poracanthodid acanthodians in the Rzepin sample supports the notion of Poracanthodes porosus Zone as a deep-water equivalent to a number of vertebrate biozones. The presence of P. ludlowiensis only in the oolitic sample confirms a long temporal range, but restricted environmental distribution for this taxon.

Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Identifikatorer
urn:nbn:se:uu:diva-281657 (URN)10.1017/S0016756817000681 (DOI)000443814900008 ()
Tillgänglig från: 2016-03-29 Skapad: 2016-03-29 Senast uppdaterad: 2018-11-06Bibliografiskt granskad

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