Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
3,924,311,977 visitors served.
forum Join the Word of the Day Mailing List For webmasters
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

underclay

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
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.
Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link 		Feedback
Mentioned in?  References in periodicals archive?   Encyclopedia browser?   Full browser?
No references found
 
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
 
 
 
Encyclopedia
?

Terms of Use | Privacy policy | Feedback | Advertise with Us | Copyright © 2012 Farlex, Inc.
Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.