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Biostratigraphy of the Vendian-Cambrian beds and the lower Cambrian boundary in Siberia

Published online by Cambridge University Press:  01 May 2009

V. V. Khomentovsky
Affiliation:
Institute of Geology and Geophysics, Academy of Sciences of Russia, Novosibirsk, 630090, Federation of Russia
G. A. Karlova
Affiliation:
Institute of Geology and Geophysics, Academy of Sciences of Russia, Novosibirsk, 630090, Federation of Russia

Abstract

General agreement exists that the position of the base of the Cambrian (Precambrian–Cambrian boundary) should coincide with a biostratigraphic marker that can be widely traced and is linked to the evolution of the small shelly fauna. On the Siberian platform the presence of distinct facies during the Vendian–Cambrian interval has made biostratigraphic correlation based on palaeontological data highly contentious. A solution to this problem appears to exist with the recognition of an almost uninterrupted profile in the Aldan–Uchur watershed where key sections expose the eastern and transitional facial region. On this basis we present a general biostratigraphic scheme for the Vendian–Cambrian across the southern Siberian platform that connects separate facies. Further correlation with key sections in northern Siberia leads to the recognition of three biostratigraphic zones for the Vendian–Cambrian interval. These are: Anabarites trisulcatus Zone; Purella antiqua Zone; Aldanocyathus sunnaginicus Zone. The abundance of Chinese-type small shelly fossils in the region of the eastern facies suggest correlation of the A. sunnaginicus Zone with the Siphogonuchites–Paragloborilus Zone of China, and the P. antiqua Zone with the Circotheca–Anabarites–Protohertzina Zone. In places, at the base of the Circotheca–Anabarites–Protohertzina Zone in China, analogies to the A. trisulcatus Zone can be identified. It is proposed that in Siberia the base of the A. sunnaginicus Zone (= base of Tommotian Stage) be taken as the base of the Cambrian. This would correspond with Marker B of the Meishucunian in China

Type
Articles
Copyright
Copyright © Cambridge University Press 1993

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References

Dorzhnamzhaa, D. & Gibsher, A. S. 1990. New data on stratigraphic allocation of vend-ediakarian fauna of Mongolia. Abstracts of Third International Symposium of the Cambrian System, Novosibirsk, p. 28.Google Scholar
Fedorov, A. B. 1982. Precambrian–Cambrian boundary deposits in South of Siberian Platform. In Boundaries of Principal Subdivisions of the Phanerozoic in Siberia, pp. 2939. Novosibirsk: SNIIGGiMS (in Russian).Google Scholar
Guidebook for Excursion on the Aldan and Lena Rivers. 1973. Moskow–Jakutsk. 117 pp.Google Scholar
Guidebook for Excursion in the Siberian Platform. 1984. Excursions 053 of 27th International Geological Congress, USSR, Moscow, 1984, pp. 174–99.Google Scholar
Guidebook for Excursion on the Aldan and Lena Rivers. 1990. Siberian Platform 3rd International symposium of the Cambrian system. Novosibirsk, 113 pp.Google Scholar
Khomentovsky, V. V. 1976. Venetian. Novosibirsk: Nauka. 271 pp. In Russian.Google Scholar
Khomentovsky, V. V. 1986. The Vendian System of Siberia and a standard stratigraphic scale. Geological Magazine 123, 333–48.CrossRefGoogle Scholar
Khomentovsky, V. V., Shenfill, V. Yu. & Pyatiletov, V. G. 1987. The principal problem of stratigraphy of the preusolic deposits occurring in the interior regions of the Siberian platform. Geologiya i geofizika, No. 11, 311 (in Russian).Google Scholar
Korshunov, B. I., Repina, L. N. & Sysoev, V. A. 1969. To the constitution of the Pestrotsvet formation in east of the Aldanian syneclise. Geologiya i geofizika, No. 4, 1821. In Russian.Google Scholar
Luo, Huilin, Jang, Zhiwen, Wu, Xiche, Song, Xueliang, Ouyang, Lin, Xing, Yusheng, Liu, Guizhi, Zhang, Shishan & Tao, Yonghe. 1984. Sinian-Cambrian boundary stratotype section at Meishucun, Jinning, Yunnan, China, 154 pp. Yunnan: People's Publishing House.Google Scholar
Missarzhevsky, V. V. 1989. Oldest skeletal fossils and stratigraphy of Precambrian and Cambrian boundary beds. Moskow: Nauka, 233 pp. (in Russian).Google Scholar
Missarzhevsky, V. V. & Rozanov, A. Yu. 1975. To the problem of the correlation of Cambrian and Precambrian boundary layers of the Siberian Platform. In Equivalents of the Vendian Complex in Siberia, pp. 101–11. Moscow: Nauka (in Russian).Google Scholar
Qian, Yu & Bengtson, S. 1989. Paleontology and biostratigraphy of the Early Cambrian Meishucunian Stage in Yunnan Province, South China. Fossils and Strata, No. 24, Oslo, 155 pp.Google Scholar
Resheniya chetvertogo mezhvedomstvennogo regionalnogo stratigraphicheskogo soveshchania po utochneniju i dopolneniju stratigraphicheskih shem venda i kembrija vnutrennich rayonov Sibirskoy Platformy. 1989. Novosibirsk, 62 pp. In Russian.Google Scholar
Savitskiy, V. E. 1962. Relation between Cambrian and Precambrian of Anabar shield. In Soveshchanie po stratigraphii otlozheniy pozdnego dokembria Sibiri i Dalnego Vostoka (Abstracts). Novosibirsk, pp. 5354 (in Russian).Google Scholar
Val'kov, A. K. 1987. Biostratigraphy of Lower Cambrian in East of Siberian Platform. Nauka: Moscow. 136 pp. (in Russian).Google Scholar
Vodanyuk, S. A. 1989. Remains of soft-bodied Metazoa from the Khatyspyt formation of Olenek Uplift. In Late Precambrian and Early Paleozoic in Siberia. Novosibirsk. Published by Institut Geologii i Geofiziki, pp. 6174 (in Russian).Google Scholar