ABSTRACT
The section studied and herein discussed comprises most of the Missouri subseries of the Pennsylvanian series. Its subdivision into two groups, the Skiatook below and the Ochelata above, is recognized.
The Seminole formation of the Stonewall Quadrangle is correlated with that part of the Coffeyville formation of Ohern lying between the top of the Lenapah limestone below and the base of the Checkerboard limestone above. The Checkerboard is raised to formation rank and the Coffeyville formation is correspondingly restricted. The Hogshooter limestone remains a formation and is expanded to include three members in the north part of the area and two in the area west of Tulsa. The Nellie Bly formation remains as originally defined. The Dewey limestone is equivalent to the Drum formation of Kansas but is absent immediately south of the Kansas-Oklahoma line, owing to pre-Chanute erosion.
The Chanute and Iola formations are mapped entirely across the area. The term Wann formation is revived and restricted. The Torpedo sandstone and overlying shale are extended both northward and southward from the type locality, but are found to be cut off at both extremities by pre-Birch Creek erosion. The Birch Creek limestone is identical with the Panther Creek limestone and probably equivalent to the Little Kaw limestone of the Kansas section. The Birch Creek rests upon the Wann formation, in the south part of the area, and overlaps, northward, the Torpedo sandstone and overlying shale, indicating an unconformity. Beds above the Birch Creek limestone in the extreme northwest part of Washington County are referred to the Weston shale of the Kansas section.
