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一、绪言本文描述的材料,大部份是云南省地质局第二区测队汪贤灼等同志于1965年采自云南峨山地区一平浪煤系;部分标本是杨勒同志于1966年采自新平地区一平浪煤系。经过研究,共得19个种,分别属于2科4属。其中有13个新种,2个未定种。峨山及新平地处滇中盆地边缘,上三叠统煤系地层与标准地区一平浪煤系大致相同, 但前者海相夹层较多。介形类化石产自连续剖面上,它们与晚三叠世海相瓣鳃类化石共生,说明它们是海生的,或可以适应不同盐度的水域。在我国,晚三叠世海相或半咸水中
I. INTRODUCTION The materials described in this article are mostly collected from a Pinglang coal mine in Eishan, Yunnan Province, in 1965 by Wang Xianzhuo and his colleagues from the Second District of Yunnan Bureau of Geology. Some of the specimens were collected by Comrade Yang Lei in 1966 Pingdingshan coal field in Pingdingshan. After research, a total of 19 species, belonging to 2 families and 4 genera. There are 13 new species and 2 undetermined species. Asan and Xinping are located on the edge of the middle Yunnan basin. The Upper Triassic coal measures are roughly the same as the Pinglian coal measures in the standard area, but the former has more marine intercalations. Ostoid fossils originate from continuous profiles that co-occur with marine trifoliate marine gill fossils indicating that they are marine or adapt to waters of different salinities. In our country, late Triassic marine or brackish water