摘要
东狼沟组为陈恺、熊永先(1935)在北京西山大灰厂西北创立的地层单位。当时描述不详,未见化石。1985—1986年,我们在研究坨里—大灰厂一带的白垩纪地层时,发现丰富的双壳类、腹足类、介形虫及鱼类等化石。化石群面貌近似于热河生物群,时代可确定为早白垩世早期。同时,对该组岩石、沉积环境也给予了简单叙述。
The Donglanggou Formation was established by Chen Kai and Xiong Yongxian, 1935, and is located NW of Dahuichang in the Western Hills of Beijing. At that time, the stratigraphic sequence was unclear and no fossils were discovered.
The authors made a detailed study in this area from 1985 to 1986 and rich fossils were found. The fauna includes bivalves, gastropods, ostracods and fish, of which the representative elements are: Bivalvia: Ferganoconcha subcentralis Chernyshev; Gastropoda: Probaicalia vitimensis Martinson, P. prinadea Martinson, Lioplacodes cf. cholnokyi (Schlesser), Amnicola cf. yunanansis Pan, Trochispira donglanggouansis (sp. nov. ), Galba cf. tongshanensis Pan; Ostracoda: Cypridea unicostata Galeeva, C. faveolata (Egger), C. usualis Wang et Zhao, Cypridea (C.) habros Wu et Yang, C. (C.) subscariformis Wu et Yang, Mongolianella sp.; Fish: Sinamia sp.
This fauna was akin to the Rehe fauna, and its age can be determined to be early Early Cretaceous. Its lithological characters and sedimentary environments are also briefly described.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第2期151-153,共3页
Geological Review
