OCCURRENCES OF GROWTH FAULTS AND IMPLICATIONS FOR REGIONAL TRANSPORT IN THE SEMINOLE FORMATION IN NE OKLAHOMA

Turkey Mountain (Jenks 7.5’ quad/ Sapulpa North 7.5’ quad) in Tulsa is a sandstone ridge located in western bank of the Arkansas River. It is crowned with the massive sandstone ledges of the Pennsylvanian (~300 Ma) Coffeyville Formation. The Coffeyville Formation is underlain by Checkerboard Limestone, which in turn overlies Seminole Formation. The Missourian Seminole Formation contains a series of stacked channel sequences. The channel units are predominantly fine grained argillaceous and micaceous sandstones, which are separated by interlaminated silty clayshale and siltstones. These channel sequences are overlain by interbedded, laminated, concretionary units of silty clayshales, mudshales, and siltstones. Horizontal burrows and tool marks are common especially at the base of the units. Siltstone intervals at the top are ripple marked with abundant horizontal trace fossils. There are occurrences of flaser beds in meter-scale tidal channels, along with presence of growth faults near the upper boundary of the Seminole Formation. Analysis of the channel units, sedimentary structures, and growth faults in the area points to a north western trend for the direction of regional transport.