摘要:
本文运用现代地层学理论,详细描述了巢湖地区寒武纪半汤泥质白云岩组,在各地古生物面貌,沉积时代的差异及厚度变化情况,确认了它在区域成生和分布上的穿时性,并建立了Kunmingaspis与Redlinchia的共存延限带。
Abstract:
The Bantang pelitic dolomite in the Chaohu Lake area, Anhui, is widespread, with distinct upper and lower boundaries and markers. Its geological age varies from place to place and shows a southwestward-younging trend, which reflects that the boundaries of the lithostratigraphic units are oblique to those of the geological age. The place where the earliest Bantang pelitic dolomite was deposited is Bantang, characterized by the presence of more Early Cambrian Redlichia; while the place where the dolomite was deposited is Suosong, characterized by the occurrence of large amounts of Middle Cambrian ptychopariids such as Kunmingaspis, Ptychoparidae and Chittidilla. The regional distribution shows striking diachronism. Besides, there also appears a concurrent-range zone composed of Redlichia and Kunmingaspis in places. It extends laterally for about 27 m and vertically for about 2 m. The range of this zone is late Early Cambrian.
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