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underclay

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underclay [′ən·dər‚klā]
(geology)
A layer of clay or other fine-grained detrital material underlying a coal bed or comprising the floor of a coal seam. Also known as coal clay; root clay; seat clay; seat earth; thill; underearth; warrant.
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At the base of the Pleasanton Group, between the Desmoinesian and the Missourian Series, a major unconformity exists where underclay would seem to correlate with a drop in sea level approximately 305 million years ago (Ross and Ross, 1988).
Sedimentology, Palynology, and Sea Level Fluctuations Recorded From ... by Oboh-Ikuenobe, Francisca E. / Transactions of the Missouri Academy of Science
 
 
 
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