
Other Geologic Projects

Stratigraphic Column of Outcrop
Hand drawn stratigraphic column drawn to scale from data retrieved from field work of an outcrop along 1-70 near Morrison, Colorado.

Niobrara Formation (Kn): Sub-units are Fort Hays Limestone (Knf) and Smoky Hill Shale (Kns). Late Cretaceous in age. Typical thickness is 730 feet in the Denver Basin. Conformably underlies Pierre Shale and unconformably overlies Carlile Shale. Marine depositional environment. Bottom of the section lies the 40-foot-thick Fort Hays Limestone. Superjacent unit is the nearly 700-foot-thick Smoky Hill Shale Member, beginning with a 20- foot- thick, thin bedded limestone and shale, or shaly limestone unit. Throughout are several layers of shale, limestone, chalk, or thin interbeds of all of these. The Upper Chalk unit is an 8-foot- thick bed of massive chalk. The most prominent fossils found in all the beds are the Inocermous. Scaphite fossils appear in the Middle Shale unit and continue throughout.
Stratigraphic Column of the Niobrara Formation
Hand drawn stratigraphic column of the Niobrara Formation drawn to scale from data collected from Geolex.