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Lower Cambrian anabaritids from south China

Published online by Cambridge University Press:  01 May 2009

S. Conway Morris  and
Chen Menge
S. Conway Morris
Affiliation:
Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, U.K.
Chen Menge
Affiliation:
Institute of Geology, Academia Sinica, Beijing, People's Republic of China
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Abstract

Anabaritids are a distinctive group of early skeletal fossils, with tri-radially symmetrical tubes. They occur in the earliest Cambrian deposits, and seem to be especially characteristic of the Tommotian strata and putative pre-Tommotian units (e.g. Manykay horizon). A detailed redescription of Anabarites rotundus Qian from near Kuanchuanpu, Shaanxi Province emphasizes the degree of morphological variation. New data on shell composition suggest a bilayered structure, the outer unit composed of fibres parallel to growth lines, overlying a distinctive inner lamella with a chevron ultrastructure. Tentative evidence for anabaritids possibly being operculate is presented, the putative operculum being a simple convex disc. More poorly preserved anabaritids from the Yangtze Gorges (Hubei Province) and Meishucun (Yunnan Province) are referred to A. trisulcatus. All these Chinese occurrences of anabaritids are consistent with a lower Tommotian age of the associated faunas, but reliable and precise correlations with other Precambrian-Cambrian boundary sections remain inconclusive.

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Articles
Information
Geological Magazine , Volume 126 , Issue 6 , November 1989 , pp. 615 - 632
Copyright
Copyright © Cambridge University Press 1989

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