This is similar to the synchronous deposition of black shale in europe . during the lower toarcian , coincident with the peak of the lower jurassic transgression , highly bituminous shales were deposited in extensive parts of the european epicontine 這種有機(jī)碳異常富集的沉積層被描述為大洋缺氧事件( oae )的沉積,與白翌紀(jì)賽諾曼十侖期類似。
百科解釋
Bituminous shale is an argillaceous shale impregnated with bitumen, often accompanying coal. It may contain kerogen; in that case it is classified as oil shale.