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Entry 1 sense Webster, 1913

Dakota group

/dək-ōt'-ə gro͞op/ · Da·ko·ta group · IPA
01 A subdivision at the base of the cretaceous formation in Western North America; -- so named from the region where the strata were first studied.
  1. 1.
    A subdivision at the base of the cretaceous formation in Western North America; -- so named from the region where the strata were first studied.(Geol.)