北喜马拉雅地区三叠纪地层划分

北喜马拉雅地区的三叠纪地层发育完整，层序清楚、构造简单、未变质，可分为土隆群、曲龙共巴组与德日荣组３个岩石地层单位，其中生物化石丰富，属典型的特提斯动物群。该地层主要出露于亚东、定结、定日、聂拉木土隆、普兰、札达马阳一带，呈东西向带状展布，在我国境内延伸达１５００ｋｍ以上，与印度库蒙（Ｋｕｍａｕｎ）地区的三叠纪地层（由下而上为：Ｃｈｏｃｏｌａｔｅｓｅｒｉｅｓ，Ｋａｌａ－ｐａｎｉＬｉｍｅｓｔｏｎｅ，ＫｕｔｉＳｈａｌｅ，ＫｉｏｔｏＬｉｍｅｓｔｏｎｅ）可以进行对比。

Triassic Lithostratigraphic Division and Biostratigraphy in the Northern Himalayan Region

The Triassic strata in the northern Himalayan region, characterized by abundant and diverse fossils, typical of Tethyan faunas, mainly crop out in Yadong, Dinggye, Tingri, Nyalam, Burang and Zanda Counties in the southern Xizang and assume a belt extending in a E—W direction. They can be divided in ascending order into three lithostratigraphic units, namely the Tulung Group, thin bedded limestone intercalated with fine grained sandstone, Qulunggongba Formation, dark grey and dark green shales, and Derirong Formation, mainly quartz sandstone, and can be correlated with the Triassic strata in the northern Nepal, Kumaun and Spiti.