期刊
BULLETIN OF GEOSCIENCES
卷 83, 期 1, 页码 23-38出版社
CZECH GEOLOGICAL SURVEY
DOI: 10.3140/bull.geosci.2008.01.023
关键词
Yochelcionella; Helcionelloida; Mollusca; lower Cambrian (Cambrian series 2); North America
Five named species of the helcionelloid mollusc genus Yochelcionella Runnegar & Pojeta, 1974 are recognized from the lower Cambrian (Cambrian Series 2) of North America: Yochelcionella erecta (Walcott, 1891), Y. americana Runnegar & Pojeta, 1980, Y. chinensis Pei, 1985, Y. greenlandica Atkins & Peel, 2004 and Y. gracilis Atkins & Peel, 2004, linking lower Cambrian outcrops along the present north-eastern seaboard. Yochelcionella erecta, an Avalonian species, is described for the first time; other species are derived from Laurentia. A revised concept of the Chinese species, Y. chinensis, is based mainly on a large sample from the Forteau Formation of western Newfoundland and the species may have stratigraphic utility between Cambrian palaeocontinents.
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