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shale
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shale

Fine-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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? Mentioned in ? References in periodicals archive
 
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.
YEMEN - The Geology by APS Review Gas Market Trends
Origin of phosphatic black shale facies in Pennsylvanian cyclothems of Midcontinent North America.
Sedimentology, Palynology, and Sea Level Fluctuations Recorded From ... by Oboh-Ikuenobe, Francisca E. / Transactions of the Missouri Academy of Science
But other imprints in the smooth black shale disple any image of a peaceful prehistoric aquarium.
When life got hard: animal skeletons emerged abruptly. Why the big ... by Stolzenburg, William / Science News
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