Lias meaning

līəs
A type of blue limestone present in parts of southern England.
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(geology) A stratigraphic group from the lower Jurassic period, consisting of thin layers of blue limestone.
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A series of rocks, the oldest or lowest part of the Jurassic System, noted for its fossils.
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Origin of lias

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

    From Wiktionary