Results: 1 - 3 of 3
Dec 31, 1957
Bulletin
… Lower Cenomanian substage of the Upper Cretaceous. Lithologic sections are … John area. The Lower Cretaceous-Upper Cretaceous boundary occurs at …
Dec 31, 1965
Earth Sciences Report
… variable thickness underlain by Upper Cretaceous strata. The surficial … surface. Maximum relief on the upper surfaces of the map-units …
Dec 31, 1957
Earth Sciences Report
… of the area is composed of Upper Cretaceous unconsolidated …