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Book Chapter

Late Cambrian relative age constraints by acritarchs on the post-Timanian deposition on Kolguev Island, Arctic Russia

By
M. Moczydłowska
M. Moczydłowska
1
Uppsala University, Department of Earth Sciences
Palaeobiology, Norbyvägen 22, SE-75236 Uppsala, Sweden
malgo.vidal@pal.uu.se
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M. Stockfors
M. Stockfors
1
Uppsala University, Department of Earth Sciences
Palaeobiology, Norbyvägen 22, SE-75236 Uppsala, Sweden
malgo.vidal@pal.uu.se
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L. Popov
L. Popov
2
Department of Geology, National Museum of Wales
Cathays Park, Cardiff CF1 3NP, UK
malgo.vidal@pal.uu.se
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Published:
January 01, 2004

Abstract

Platformal sedimentary successions, inferred to overlie folded Neoproterozoic basement complexes and the post-Timanian unconformity, were studied in the Bugrino 1 and North-Western 202 boreholes on Kolguev Island, southern Barents Sea. They yielded diverse, age-diagnostic acritarchs and some shelly fossils. The Upper Cambrian strata, referred to the Peltura and Acerocare zones, are recognized by means of acritarch taxa known from the East European Platform and other areas in Baltica, Avalonia, and Gondwana. Shelly faunas of brachiopods, phyllocarid crustaceans and problematic molluscs are indicative of the Tremadoc and Arenig stages in the upper part of the succession. The boreholes did not reach the Timanian unconformity and older Cambrian strata may be present. Within the area of the Pechora Basin, Cambrian strata have been identified with certainty only on Kolguev Island. Further east in the Polar Urals, Upper Cambrian strata are present and Lower or Middle Cambrian and Vendian strata have been claimed, though not yet proven. They are reported from several localities, but the fossils are poorly documented. The biostratigraphic evidence and facies development indicate that Upper Cambrian deposits may have been distributed widely along the northeastern margin of Baltica, as they were on the East European Craton and in Baltoscandia.

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Contents

Geological Society, London, Memoirs

The Neoproterozoic Timanide Orogen of Eastern Baltica

David G. Gee
David G. Gee
Uppsala University, Sweden
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Victoria Pease
Victoria Pease
Stockholm University, Sweden
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Geological Society of London
Volume
30
ISBN electronic:
9781862394056
Publication date:
January 01, 2004

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