Lias Hear it!

Lias definition

Lias (lī′əs)

noun

a series of rocks, the oldest or lowest part of the Jurassic System, noted for its fossils

Etymology: ME lyas < OFr liois (Fr liais), kind of limestone < ? Gmc, as in MHG leie, stone

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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