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carbonaceous shale

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carbonaceous shale [kär·bə′nā·shəs ′shāl]
(geology)
Shale rich in carbon.


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Gravity surveys indicate the basin is more than 10,000 feet deep, with exposed intervals of 537 feet of coals or carbonaceous shales, St.
Hutton (1991) visualizes oil shale as one of three broad groups of organic-rich sedimentary rocks: (1) humic coal and carbonaceous shale, (2) bitumen-impregnated rock (tar sands and petroleum reservoir rocks), and (3) oil shale.
Uranium mineralization has been found in three types of deposits in this area: (1) low-grade deposits associated with Eocene sub-bituminous coal and carbonaceous shale in the central and eastern part; (2) low grade caliche-type deposits of schroeckingerite in Eocene sediments in the north-central part; and (3) higher grade deposits in Eocene sandstone and conglomerate at Crooks Gap at the north edge of the basin.
 
 
 
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