Hypertext Webster Gateway: "Trias"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trias \Tri"as\, n. [L., triad. See {Triad}.] (Geol.)
The formation situated between the Permian and Lias, and so
named by the Germans, because consisting of three series of
strata, which are called in German the Bunter sandstein,
Muschelkalk, and Keuper.
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