caa a22 4500 386401616 CHVBK 20180307112201.0 cr unu---uuuuu 161130e198911 xx s 000 0 eng 10.1017/S0016756800006920 doi S0016756800006920 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800006920 Lower Cambrian anabaritids from south China [Elektronische Daten] 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. Copyright © Cambridge University Press 1989 Conway Morris S. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, U.K. Menge Chen Institute of Geology, Academia Sinica, Beijing, People's Republic of China Geological Magazine Cambridge University Press 126/6(1989-11), 615-632 0016-7568 126:6<615 1989 126 GEO https://doi.org/10.1017/S0016756800006920 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800006920 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Conway Morris S. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, U.K NATIONALLICENCE 700 1- Menge Chen Institute of Geology, Academia Sinica, Beijing, People's Republic of China NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/6(1989-11), 615-632 0016-7568 126:6<615 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge