Definition of lias in English:

lias

Line breaks: lias
Pronunciation: /ˈlʌɪəs
 
/

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, consisting of shales and limestones rich in fossils.
  • 1.2 (also blue lias) [mass noun] A blue-grey clayey limestone derived from marl deposited in the Lower Jurassic, found chiefly in SW England.

Derivatives

liassic

Pronunciation: /lʌɪˈasɪk/
adjective

Origin

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

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