The Qinjiamiao Group in the Yangtze Gorge area is mainly composed of thin-bedded dolostones.
三峡地区覃家庙群以一套缺乏化石的薄层白云巖沉积为特征。
Soft and thin-bedded characteristics and dynamic load action from mining and blasting shock are some basic features of the actual mining roadways in coalmine.