black shale

The Upper Triassic Formation is sub-abysmal basinal facies deposit in the south and north depressions. A black shale layer developed.

上三叠统在南、北坳陷为次深海盆地相沉积，发育一套黑色页岩烃源层；

Field observations and analysis indicate that the main materials of the waste rock dump are the host rock Middle Ordovician black shale and primary carbonate manganese ore.

野外观察及分析结果表明：组成废矿堆的岩石主要是赋矿围岩中奥陶统黑色页岩和原生碳酸锰矿石。

A kind of animal maceral in marine black shale

海相黑色页岩中一种动物型的有机显微组分

The black graptolite shale facies indicate a deep-water, half enclosed and anoxic sedimentary environment.

中奥陶世黑色的笔石页岩为典型的半封闭缺氧的深水沉积环境,反映了海水逐步加深,水体也变得相对宁静.