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Assemblages of calcareous algae near the Precambrian/Cambrian boundary in Siberia and Mongolia

Published online by Cambridge University Press:  01 May 2009

Robert Riding  and
Larisa Voronova
Robert Riding
Affiliation:
Department of Geology, University College, Cardiff CF1 1XL, U.K.
Larisa Voronova
Affiliation:
Palaeontological Institute, Academy of Sciences, ul. Profsoyuznaya 113, Moscow 117321, U.S.S.R.
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Abstract

Calcareous algae make their first appearance near the base of the Tommotian. The oldest confirmed occurrences are of ?Gemma, Obruchevella and Renalcis in the Nemakit-Daldyn Horizon and late Yudomian of Siberia. A little higher in the sequence, in the Aldanocyathus sunnaginicus Zone of the earliest Tommotian, Angulocellularia, Bajanophyton, Batenevia, Botomaella, Girvanella, Hedstroemia, Korilophyton, Proaulopora, Subtifloria, and Tarthinia appear. Immediately above this, in the Dokidocyathus regularis Zone of the middle Tommotian, Chabakovia appears with the epiphytacean genera Epiphyton, Gordonophyton and Tubomorphophyton. There are only minor subsequent additions to this flora before the end of the Atdabanian. Kordephyton appears in the Dokidocyathus lenaicus Zone of the late Tommotian and Razumovskia in the early Atdabanian.

These fossils constitute three calcareous algae assemblages (CAA 1, 2, 3) characteristic of the Nemakit-Daldyn Horizon/late Yudomian, early Tommotian, and middle Tommotian/Atdabanian respectively. Most of the genera are long-ranging, but their rapid appearance and diversification near the base of the Tommotian repesents an important event in the history of calcareous algae and augments faunal data concerning evolution and biostratigraphy near the Precambrian/Cambrian boundary.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 3 , May 1984 , pp. 205 - 210
Copyright
Copyright © Cambridge University Press 1984

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