He also helped to standardize the nomenclature of geological structures in the Midwest .
Owen 's most significant contribution to the field of geology was identifying and naming major geological formations of the Mississippi River Valley and placing them in relative position on a geological timeline .
Owen also helped to standardize the nomenclature of geological structures in the Midwest .
Owen 's most significant contribution to the field of geology was identifying and naming major geological formations of the Mississippi River Valley and placing them in relative position on a geological timeline .