Definition of Lias in English:

Lias

Syllabification: Li·as
Pronunciation: /ˈlīəs
 
/

noun

(the Lias) Geology
  • 1The earliest epoch of the Jurassic period, lasting from about 208 to 178 million years ago.
  • 1.1The system of rocks deposited during the Lias epoch, consisting of shales and limestones rich in fossils.

Derivatives

liassic

Pronunciation: /līˈasik/
adjective

Origin

late Middle English (denoting blue lias): from Old French liais 'hard limestone', probably from lie (see lees).

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