Date of Award
Master of Science (MS)
Sedimentologic, petrographic, and taphonomic evidence indicates that the strata exposed at the Minium Quarry, Graham County, Kansas (SE ¼, Section 34, T7S, R25W) represent a sheet-flood deposit within a stream-dominated environment. These fossiliferous and conglomeratic muddy sandstone are part of the late Miocene Ash Hollow Formation of the Ogallala Group. The muddy sandstones contain three separate bone horizons containing rhinoceros, horse, camel, turtle, and rodent remains that exhibit weathering cracks and carnivore markings. Also present in the mudstones and muddy sandstones are fresh-water mollusks and floral remains of grasses, sedges, borages, chenopods, hackberries, and pondweeds. Other floral structure remains include leaves, stems, roots, and wood from various plants. The plant remains are dominated by sedges, plants that primarily inhabit hydric environments. Lastly, paleoclimates ranged from semi-arid to subtropical.
Copyright 1992 Julie M. Churchill
Churchill, Julie M., "Depositional Environment of the Ogallala Group (Miocene), Minium Quarry, Graham County, Kansas" (1992). Master's Theses. 2320.