| dc.description.abstract | The Missourian Series Nellie Bly Formation in northeast Oklahoma is a clastic unit composed of shales, siltstones, and sandstones. An investigation was conducted to ascertain the distribution of the Nellie Bly Formation, its depositional environment(s), and regional stratigraphic relationships in northeast Oklahoma. The Nellie Bly Formation was studied on the surface and in the shallow subsurface. The study area encompassed portions of Osage, Tulsa, Washington, Pawnee, and Creek Counties in Oklahoma. Surface data from outcrops was incorporated to aide and facilitate interpretations of wireline logs used in the subsurface study. Approximately 360 well logs were utilized in the construction of structure, isopach, and gross sand maps of the Nellie Bly Formation. A network of loop and tie cross sections was constructed to study lateral changes of the Nellie Bly Formation. Interpretations based upon outcrop observations, well log signatures, and isopach/gross sand maps indicate the Nellie Bly Formation was deposited in shallow marine shelf and deltaic environment. The Nellie Bly Formation is composed primarily of shales with lesser amounts of siltstones and sandstones. Southward, the formation thickens and sandstone beds increase in thickness and abundance. Deltaic facies observed in the Nellie Bly Formation include prodelta, delta front, and stream-mouth bar. The Nellie Bly Formation is \ predominantly a regressive clastic deposit bounded by two transgressive limestones - the Hogshooter Limestone below and the Dewey Limestone above. | |
