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Journal of the Geological Society; 1995; v. 152; issue.3; p. 499-510;
DOI: 10.1144/gsjgs.152.3.0499
© 1995 Geological Society of London

Article

Constraints on the early Cambrian radiation and correlation of the Tommotian and Nemakit-Daldynian regional stages of eastern Siberia

G. VIDAL1, M. MOCZYDLOWSKA1 & V. R. RUDAVSKAYA2

1 Uppsala University, Institute of Earth Sciences, Micropalaeontology, Norbyvägen 22, S-752 36 Uppsala, Sweden
2 VNIGRI, Cejzdowskaya 27a, St Petersburg, B–53, Russia

Acritarchs of early Cambrian age occur in strata attributed to the Middle Tommotian in northeastern Siberia. A diagnostic assemblage from a part of the Tyusersk Formation referred to the Dokidocyathus regularis Zone (Middle Tommotian) at Chekurovka, and a much poorer assemblage from Ulakhan-Aldyarkhay, indicate time-equivalence with the Heliosphaeridium dissimilare–Skiagia ciliosa acritarch Zone and the correlative Holmia kjerulfi trilobite Zone in Baltica. The bulk of the species turnover which is part of the Cambrian explosion, including archaeocyathans, small shelly fossils, trilobites and acritarchs, is inferred to occur in the Skiagia ornate–Fimbriaglomerella membra-nacea (= Schmidtiellus/Rusophycus faunal zone) and H. dissimilare–S. ciliosa (= Holmia kjerulfi trilobite Zone) acritarch zones.


Keywords: Tommotian, Lower Cambrian, radiation, Siberia, acritarchs.




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