\Lar"a*mie group`\ (Geol.)
An extensive series of strata, principally developed in the
Rocky Mountain region, as in the Laramie Mountains, and
formerly supposed to be of the Tertiary age, but now
generally regarded as Cretaceous, or of intermediate and
transitional character. It contains beds of lignite, often
valuable for coal, and is hence also called the {lignitic
group}. See Chart of {Geology}.