Australian Middle Cambrian molluscs and their bearing on early molluscan evolution
作者:
Bruce Runnegar,
PeterA. Jell,
期刊:
Alcheringa: An Australasian Journal of Palaeontology
(Taylor Available online 1976)
卷期:
Volume 1,
issue 2
页码: 109-138
ISSN:0311-5518
年代: 1976
DOI:10.1080/03115517608619064
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Twenty-eight species of fifteen genera of Middle Cambrian molluscs are described from tiny phosphatic moulds or silica replicas of the shells. The molluscs were etched from limestones at two sites: one in the earliest Middle Cambrian Coonigan Formation of the Mootwingee area, 130 km northeast of Broken Hill, New South Wales; and another in the middle Middle Cambrian Currant Bush Limestone of the Thorntonia area, 150 km northwest of Mt Isa, Queensland. These unusually diverse collections show that many different kinds of molluscs lived in the tropical Australian seas of the Middle Cambrian and provide new information on the way the molluscan classes Cephalopoda, Gastropoda, Rostro- conchia, and Pelecypoda evolved.
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