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black shale |
Also found in: Wikipedia, Hutchinson | 0.03 sec. |
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black shale [¦blak ′shāl] (petrology) Very thinly bedded shale rich in sulfides such as pyrite and organic material deposited under barred basin conditions so that there was an anaerobic accumulation. Also known as biopelite. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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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