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Cambro-Ordovician microorganisms: acritarchs and endoliths
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic-walled microfossils are abundant and taxonomically diverse in Cambrian-Ordovician strata; some are important for biostratigraphy and for the correlation of geological successions. New assemblages of Cambrian-Ordovician acritarchs from Kolguev Island, Arctic Russia and Middle Cambrian ichnofossils of endoliths from Peary Land, North Greenland are studied. Twenty-seven acritarch species are described in detail and 10 taxa are left under open nomenclature. The diagnosis of one genus is restricted, and two other are emended. New combinations are proposed for three species and one new species is recognised. The studied acritarch assemblages are taxonomically rich and age-diagnostic and used to recognise Upper Cambrian and Tremadoc strata on Kolguev Island. The sedimentologically continuous successions provide for the first time palaeontological evidence of Cambrian strata in the north-eastern sector of Europe. The exact level of the Cambrian-Ordovician boundary was distinguished together with stratigraphic intervals equivalent to the Peltura and Acerocare zones of the Upper Cambrian of Baltica. The newly established relative age of the lowermost sedimentary succession overlying the Timanian unconformity allows verification of the minimum age of the Timanian deformation and the time-span of the hiatus bound to this unconformity. Endoliths occur in the fossil record from the Early Archean and they played an important role in the formation of stromatolites and the process of bioerosion and biodegradation. Endoliths that have actively bored into brachiopod shells or carbonate grains (euendoliths), and some that inhabited the cavities inside brachiopod shells (cryptoendoliths) are described. Borings within the carbonate grains extended with a dentritic pattern, whereas those within the brachiopod shells were formed by a multifilamentous euendolith which produced characteristic longitudinally ridged galleries. The cryptoendolithic morphologies include indeterminate coccoid masses and at least two filamentous forms. However, considerable variation in the dimensions of the currently phosphatised diagenetic crusts of the cryptoendoliths hinders discrimination.

Place, publisher, year, edition, pages
Uppsala: Institutionen för geovetenskaper , 2005. , p. 29
Keywords [en]
Earth sciences, Cambrian, Ordovician, acritarch, endolith, Kolguev Island, North Greenland, Stratigraphy
Keywords [sv]
Geovetenskap
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-5726ISBN: 91-506-1798-2 (print)OAI: oai:DiVA.org:uu-5726DiVA, id: diva2:166094
Public defence
2005-04-29, Lecture Theatre, Palaeontology Building, Norbyvägen 22, Uppsala, 13:00
Opponent
Supervisors
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved
List of papers
1. Upper Cambrian-Ordovician successions overlying Timanian complexes: new evidence of acritarchs and brachiopods from Kolguev Island, Arctic Russia
Open this publication in new window or tab >>Upper Cambrian-Ordovician successions overlying Timanian complexes: new evidence of acritarchs and brachiopods from Kolguev Island, Arctic Russia
2004 In: Geobios, Vol. 37, no 2, p. 239-251Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92793 (URN)
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved
2. ACRITARCHS FROM THE CAMBRIAN-ORDOVICIAN BOUNDARY INTERVAL ON KOLGUEV ISLAND, ARCTIC RUSSIA
Open this publication in new window or tab >>ACRITARCHS FROM THE CAMBRIAN-ORDOVICIAN BOUNDARY INTERVAL ON KOLGUEV ISLAND, ARCTIC RUSSIA
2004 In: Palynology, ISSN 0191-6122, Vol. 28, p. 15-73Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92794 (URN)
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved
3. Late Cambrian relative age constraints by acritarchs on the post-Timanian deposition on Kolguev Island, Arctic Russia
Open this publication in new window or tab >>Late Cambrian relative age constraints by acritarchs on the post-Timanian deposition on Kolguev Island, Arctic Russia
2004 In: Geological Society of London, Memoirs, ISSN 0435-4052, Vol. 30, p. 159-168Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-92795 (URN)
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved
4. Endolithic Cyanobacteria from the Middle Cambrian of North Greenland
Open this publication in new window or tab >>Endolithic Cyanobacteria from the Middle Cambrian of North Greenland
In: GFF, ISSN 1103-5897Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-92796 (URN)
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved
5. Euendoliths and cryptoendoliths within late Middle Cambrian brachiopod shells from North Greenland
Open this publication in new window or tab >>Euendoliths and cryptoendoliths within late Middle Cambrian brachiopod shells from North Greenland
In: GFF, ISSN 1103-5897Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-92797 (URN)
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved

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