Lias Definition

līəs
noun
A series of rocks, the oldest or lowest part of the Jurassic System, noted for its fossils.
Webster's New World

A type of blue limestone present in parts of southern England.

Wiktionary

(geology) A stratigraphic group from the lower Jurassic period, consisting of thin layers of blue limestone.

Wiktionary

Origin of Lias

  • Originally dialectal, from Old French liois (“compact limestone") (French liais).

    From Wiktionary

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Lias