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The Collaborative International Dictionary of English v.0.48:

Jura-trias \Ju`ra-tri"as\, n. (Geol.)
   A term applied to many American Mesozoic strata, in which the
   characteristics of the Jurassic and Triassic periods appear
   to be blended. -- Ju`ra-tri*as"sic, a.
   [1913 Webster]