GIVETIAN (DEVONIAN)RUGOSE CORALS FROM WANGYOU,HUISHUI,GUIZHOU (1)
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Abstract:
Wangyou of Huishui County and Dushan County are the two best localities in well-developed Devonian sequences in the south of Guizhou Province. They are characterized by the occurrences of abundant fossils and solid research foundations. The thick late Middle Devonian shallow marine deposits exposed in Wangyou of Huishui County is composed of mainly terrestrial debris and its corals are dominated by solitary rugose corals, while the sequences in Dushan County are characterized by carbonates intercalated with siliceous clasts that are not very thick,and the possession of both colonial and solitary corals.Based on the Middle Devonian biostratigraphic work,it is proposed that the occurrence of the solitary rugose coral Sinospongophyllumcan be an important boundary for stratigraphic divisions of the regions:the lower part of the Wenglai Formation occurs below Sinospongophyllum-bearing horizon,correlative to the Songjiaqiao Member in the outcrops of the Dushan County,while the upper part of the Wenglai Formation occurs above Sinospongophyllum-bearing horizon,correlative to the Jiwozhai Member in the outcrops of the Dushan County, as below the Sinospongophyllum layers,the sequences were named Songjiaqiao Member and the appearance of Sinospongophyllum indicated the start of the Jiwozhai Member in Dushan County.The solitary Sinospongophyllum and colonial Endophyllum bear similar internal skeletons,with the difference in their external morphologies,suggesting that they lived in different marine environments.The present study describes 7 species of 6 genera of rugose corals from the lower part of the Wenglai Formation:Grypophyllum wangyouense(Li in Kong and Huang),Grypophyllum cf.primum Wedekind,Cyathophyllum wenglaiense sp.nov.,Sinodisphyllum litvinovitshae(Soshkina),Temnophyllum majus Walther, Argutastrea quadrigemina(Goldfuss), and Ceratophyllum simplexsp.nov.The corals from the upper part of the Wenglai Formation will be addressed in future works.
