虫化石
虫化石-
西秦岭晚志留世&泥盆纪的虫颚化石
Upper Silurian to Devonian scolecodont fossils from West Qinling Mountains
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滇西保山地区丁家寨组及其上覆卧牛寺组，前人根据其中（虫筳）类化石定为上石炭统（马平阶），沿用至今。
The Dingjiazhai Formation and its overlying Woniusi Formation in the Baoshanregion were referred to as Upper Carboniferous ( the Maping Stage ) by predecessors .