lias definition

  • noun:
    • a form of blue limestone contained in components of southern The united kingdomt.
    • A stratigraphic group from lower Jurassic period, consisting of slim levels of blue limestone.
    • The Best of the three divisions of Jurassic period; a name provided in The United Kingdomt and Europe to a series of marine limestones underlying the O├Âlite. See the Chart of geology.
    • In geology, the reduced division of the Jurassic.

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