The Dengying Formation fossil oil pool of Upper Sinian in Nanshanping, Cili County, Hunan Province was formed in Late Silurian-Early Devonian Period.

• 湖南慈利南山坪乡上震旦统灯影组古油藏形成于晚志留世一早泥盆世时期，主要储集空间为灯影组白云岩因溶蚀作用形成的溶孔、溶洞和裂缝。