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n. A fine-grained, dark gray sedimentary rock, formed from silt and clay and similar to shale but without laminations.

n. A fine-grained sedimentary rock whose original constituents were clays or muds.

n. A fine argillaceous rock, often containing more or less sand, somewhat harder than clay, and destitute of any distinct lamination.

"The "shale" is a sedimentary rock known as mudstone, and the "oil" is a waxy solid called kerogen."

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