1 entry 1 source
Dakota Group
Open directlyWebster's 1828 Dictionary · 1828
Part of speech: noun (n.)
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 entry 1 source
Part of speech: noun (n.)
A subdivision at the base of the cretaceous formation in Western North America; -- so named from the region where the strata were first studied.