STUDY ON ORDOVICIAN FLOIAN GRAPTOLITE FAUNA IN ZHONGXIANG AREA, NORTHERN MARGIN OF THE YANGTZE PLATFORM
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Abstract:
The Florian in Zhongxiang, Hubei Province is mainly composed of grayish black shale with siltstone and limestone lens, and has high abundance and diversity of fossils. Thirty-one species belonging to 7 genera of graptolites were identified in Wen-xiakou section through systematic collection and identification, which are common genera and species in Yangtze platform area. There are Didymograptellus bifidus Biozone, Corymbograptus deflexus Biozone and Azygograptus suecicus Biozone in ascending order, which is consistent with Yichang and Nanzhang area, but the composition of fossil genera and species is quite different. Zhongxiang area is located at the margin of Yangtze Platform in Floian with rich nutrients and low oxygen environment, which are beneficial to the flourishing of graptolite fauna and the preservation of graptolite fossils.
