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本文首次报导了湘西北地区大庸,桑植一带吴家院组牙形类动物群,计有30属,近百个种及亚种。根据属种特征分为Spathognathodus celloni,Spa.celloni simplex两个组合带,经与国内外相应牙形类化石带对比,除产有区域性的属种外,与欧洲关系密切。确认湘西北地区是吴家院组即原罗惹坪群和砂帽群的下部地层,应属下志留统。本文还讨论了该区牙形类颜色变化与油气生、储的关系,并对寻找油气藏作出远景预测。
This article reports for the first time in the area of Dayong and Sangzhi in the northwestern Hunan Province, the Wujianyu Formation, which has 30 genera, nearly 100 species and subspecies. According to their genera, they are divided into two assemblages: Spathognathodus celloni and Spacelloni simplex. Compared with the corresponding teratoid fossils at home and abroad, they are closely related to Europe except for their genera. Confirm that the northwestern part of Hunan Province is the lower strata of the Wujianyuan Formation, that is, the former Luojiaoping Group and the sand hat group, and should be under the Silurian. This paper also discusses the relationship between the change of the color of the dentition and the genesis and storage of oil and gas in the area, and makes a long-term prediction of the oil and gas reservoirs.