In lamina of shale which deposited in deep lake away from paleo-debouchment in the Shahejie Formation in the Jiyang Depression, some aeolian silty sand was discovered.

该岩呈深灰色或棕褐色 ,理发育 ,主要富含有机质纹层和浅灰色钙质纹层毫米级沉积层偶组。