后者为礁后泻湖相黑色富有机质岩层，厚度较薄。

The latter resulted from the deposition of dark and organic-rich material in the back reef and the lagoon.

youdao

后者为礁后泻湖相黑色富有机质岩层，厚度较薄。

The latter resulted from the deposition of dark and organic-rich material in the back reef and the lagoon.

youdao