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燕山地区的昌平组以豹斑状灰岩为主的碳酸盐岩地层,假整合覆于震旦系青白口统景儿峪组之上,与上覆地层馒头组呈整合接触。昌平组在北京昌平县龙山一带发育最好。项礼文等(1964)在该地昌平组灰岩中发现Palaeolenus fengyangensis Chu和Redlichia sp.
The Changping Formation in the Yanshan area is dominated by leopard-spotted limestone. The fossiliferous layers are superimposed on the Jing’eru Formation in the Qingbaikou System of the Sinian and are in integrated contact with the steamed bun group in the overlying strata. Changping group in Changping County, Beijing Longshan best development. Item Li Wen et al. (1964) found Palaeolenus fengyangensis Chu and Redlichia sp.