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shale |
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shaleFine-grained and finely layered sedimentary rock composed of silt and clay. It is a weak rock, splitting easily along bedding planes to form thin, even slabs (by contrast, mudstone splits into irregular flakes). Oil shale contains kerogen, a solid bituminous material that yields petroleum when heated. |
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Arwa (Kimmeridgian to Tithonian): The Arwa formation is composed of argillaceous limestone, deep-water lime mudstone, and locally minor packstone, wackestone, grainstone, and black shale. Origin of phosphatic black shale facies in Pennsylvanian cyclothems of Midcontinent North America. But other imprints in the smooth black shale disple any image of a peaceful prehistoric aquarium. |
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