D defs.my
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Entry 1 sense Webster, 1913

Portage group

/pôr'-təj gro͞op/ · Por·tage group · IPA
01 A subdivision of the Chemung period in American geology. See Chart of Geology.
  1. 1.
    A subdivision of the Chemung period in American geology. See Chart of Geology.(Geol.) See: Geology