Sentences with phrase «black shale containing»

Interspersed in the red stone were narrow bands of black shale containing petrified fish, from a time when a deep lake covered the area.

The black shales contained high concentrations of the elements molybdenum and rhenium, long before the Great Oxidation Event.

Not exact matches

He studied two well - preserved sequences of black shale, a type of rock that often contains organic matter and can produce oil under the right conditions.

To find out whether acid rain was indeed the problem, the team focused on one problematic sliding layer in the Jiweishan avalanche: a thin bed of black shale, which contains slippery clay minerals such as talc, in addition to fine organic material and calcite, which helps cement the shale together.