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Lower Cambrian acritarchs from northern Spain: the Precambrian-Cambrian boundary and biostratigraphic implications

Published online by Cambridge University Press:  01 May 2009

Teodoro Palacios  and
Gonzalo Vidal
Teodoro Palacios
Affiliation:
Universidad de Extremadura, Facultad de Ciencias, Area de Paleontologia, 06071 Badajoz, Spain
Gonzalo Vidal
Affiliation:
Uppsala University, Micropalaeontological Laboratory, Institute of Palaeontology, Box 558, S-751 22 Uppsala, Sweden
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Abstract

Acritarchs are reported from basal Cambrian rock units inthe Cantabrian region of northern Spain that are known to contain archaeocyathan and trilobite faunas. Biostratigraphic correlation of the Iberian sequences with other regions has been hampered by the strong provincialism of these faunas. However, this report of evidently cosmopolitan acritarch taxaestablishes the time equivalence of early Cambrian trilobite faunas from Iberia, Baltoscandia and the East European Platform (EEP). Our data suggest that the detrital deposition of the Lower Cambrian Herreria Formation embraces at least three (and possibly four) Lower Cambrian acritarch zones previously identified in the EEP, eastern Siberia, Baltoscandia, Scotland, Greenland, Svalbard and western North America. The early Cambrian transgression in northern Spain was probably initiated in Talsy times (Schmidtiellus mickwitzi trilobite Zone in Baltoscandia and the EEP), in part corresponding to the Dokidocyathus regularis archaeocyathian Zone of the Middle Tommotian in Siberia.

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Information
Geological Magazine , Volume 129 , Issue 4 , July 1992 , pp. 421 - 436
Copyright
Copyright © Cambridge University Press 1992

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