The Donglanggou Formation was established by Chen Kai and Xiong Yongxian, 1935, and is located NW of Dahuichang in the Western Hills of Beijing.

• 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。