lias - WordReference.com Dictionary of English

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lias

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Concise Oxford English Dictionary © 2008 Oxford University Press:
lias /ˈlʌɪəs/

▶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).

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