The observations here recorded were obtained in connection with structural mapping in 23 counties in central and west-central Oklahoma. The stratigraphic section begins with the Belle City limestone and extends upward to include the Quartermaster formation. In order to avoid lengthy descriptions, detailed columnar sections have been arranged to show the gradations and relative positions of the sediments below the Marlow overlap.

The Vamoosa formation overlaps southward. The continuous limestone which separates the Vamoosa from the Pontotoc terrane is the Deer Creek of the Pawhuska formation. The Grayhorse limestone marks the top of the Vanoss formation across the entire area. The Asher sandstone is a gradational equivalent of the upper Stratford shale. The Pontotoc terrane is 1,350 feet thick in T. 9 N. The top of the Pontotoc is the approximate time equivalent of the Herington limestone of northern Oklahoma. The Permian-Pennsylvanian contact is considered to be at this horizon.

The Wellington and Garber can not be separated south of northern Oklahoma County. In Cleveland County the Garber-Wellington section is 900 feet thick and is 90 per cent sandstone; southward it grades rapidly to a predominance of shale in northern Garvin County. In west-central Garvin County, sandstones equivalent in age to the Garber grade northward into shale.

The Hennessey shale boundaries transgress stratigraphic boundaries. In southern Garvin County the Hennessey-Garber-Wellington section contains no continuous mappable beds or formation contacts. One bed near the top of the Hennessey is mappable in this area.

The Duncan sandstone is a wedge 600 feet thick in the southeastern part of the Anadarko basin, where it has been divided into three local members. The point of this wedge extends northward to Kingfisher County and westward to Kiowa County. No unit comparable with the description of the "Chickasha formation" can be traced.

South from Canadian County and east from Kiowa County, the Blaine and Dog Creek formations lose their identity through gradations. The equivalents of both formations are absent through erosion and subsequent overlap in southern Grady County where the Marlow is in contact with the middle Duncan.

The Marlow unit is given formation rank which agrees with Roger Sawyer's original classification. Columnar sections show the members and beds of this formation. The Rush Springs sandstone is also given formation rank since it has an unconformity at the base and one at the top. Cloud Chief gypsums are local facies of the basal sandstone member of the Quartermaster formation. All the Quartermaster dolomites are limited to this same member and occur irregularly in a section at least 125 feet thick. Any or none of these dolomites may be the equivalent of the Day Creek dolomite of northwestern Oklahoma. The Quartermaster formation has the Doxey shale member in the middle and the Elk City sandstone member at the top.

The two Pennsylvanian limestones previously mentioned and the Blaine gypsum formation are the only markers that can be traced definitely from the Kansas line through central Oklahoma. The remaining 98 per cent of the sediments are largely shoreward gradations. The classifications of these non-marine sediments can not be adjusted to fit the details of divisions made in the marine section on the north.

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The term "Red-beds" has been avoided since color changes are obviously stratigraphically transgressional or associated with local structure. In the Pennsylvanian sediments the red color is most pronounced in areas having the highest percentage of sandstone. About 75 per cent of the sediments of the entire area are red in color.