NEW MATERIAL OF RUGOSE CORALS FROM THE UPPERMOST ORDOVICIAN (HIRNANTIAN) IN NORTHERN GUIZHOU AND THEIR GEOLOGICAL SIGNIFICANCE
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Abstract:
The latest Ordovician(Hirnantian) rugose coral fauna from the Guanyinqiao Beds in Bijie, Renhuai and Shiqian districts of northern Guizhou are studied in detail, and some genera and species are reviewed. 4 genera and 2 species of rugose corals are reported from the Guanyinqiao Beds in northern Guizhou for the first time, they are Axiphoria, Bodophyllum, Dalmanophyllum, Leolasma, Brachyelasma unicum (Neuman), and Grewingkia anguinea (Scheffen). In the past, quite a number of rugosan taxa, including the genera Borelasma, Kenophyllum and Ullernelasma, etc.had been discovered in the Guanyinqiao Beds (He, 1978, 1985). The present new material thus further enrich the content of the latest Ordovician (Hirnantian) rugosan fauna in the Upper Yangtze region and indicate the close affinities of the Late Ordovician rugosan faunas in the Yangtze region to those of Scandinavia and central Asia.Up to now, totally 39 species of 18 genera have been found from the Guanyinqiao Beds (see Table I). Among them, 12 species of 10 genera of rugosan are described in this paper, including 1 new genus and 3 new species, namely Amplexobrachyelasma He et Chen gen. nov., Grewingkia densicolumna He et Chen sp. nov., Kenophyllum fossulatum He et Chen sp. nov. and Leolasma qianbeiense He et Chen sp. nov.
