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What (who) is Lias - definition
WIKIMEDIA DISAMBIGUATION PAGE
Liassic; Lias (disambiguation); LIAS
Lias
Geology the earliest epoch of the Jurassic period, from about 208 to 178 million years ago.
Lias
·noun The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. ·see the Chart of Geology.
lias
['l???s]
¦ noun
1. (Lias) Geology the earliest epoch of the Jurassic period, from about 208 to 178 million years ago.
2. (also blue lias) a blue-grey clayey limestone of this epoch, found chiefly in SW England.
Derivatives
liassic adjective
Origin
ME: from OFr. liais 'hard limestone', prob. from lie (see lees).
