北祁连东段天祝冷龙岭一带三叠纪地层

近年来的调查研究表明，分布于北祁连东段天祝冷龙岭一带的叠系可划分为上三叠统和中三叠统两部分。前者含较丰富的我国北方晚三叠世Ｄ－Ｂ植物群化石，与甘肃靖远晚三叠世南营儿群最接近，同属温湿气候条件下的河流相至湖泊沼泽相含煤碎屑沉积。后者化石少，但能显示出较老的中三叠世面貌，与白银丁家窑组一致，建议用南营儿群和丁家窑组分别代表本区的晚三叠世和中三叠世地层。

The Triassic Strata of the Lenglongling of Tianzhu in the East Part of the Northern Qilian Mountains

The recently study shows that the Triassic strata distributed in the Lenglongling of Tianzhu in the east part of the northern Qilian Mountains may be divided into two groups, upper and middle Triassic series. The former contains many late Triassic plant fossils of the Danaeopsis Bernoullia flora in north China. It is approximate to the late Triassic Nanyinger Group at Jingyuan, Gansu province. Both of them are clastic deposits with coal from river facies to lake morass facies in warm wet climate. The latter takes a middle Triassic countenance like the Dingjiayao Formation at Jingyuan. It is suggested that the names of Nanyinger Group and Dingjiayao Formation stand for late and middle Triassic strata in the area respectively.