Geologist should reach a general agreement on stratigraphic nomenclature in central-northern Oklahoma. The confusion which has resulted from erroneous correlations and misuse of formation names has retarded the progress of subsurface work. The correct use of the old names is all that is

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necessary to eliminate this confusion. As an example, the name Cottage Grove is recommended for the section of erratic sandstones variously called "Layton," "Upper Layton," "Osage Layton," "Layton of Ponca City," "Peoples," and "Mussellem"; however, the name Layton should be retained for the sandstone below the Hogshooter.

The most conspicuous aspect of the stratigraphy is the near parallelism of all of the beds, expect the erratic sandstones and limestones, in the marine Permian and Pennsylvanian. Local disconformities probably occur in this part of the section, but there are no major angular unconformites, even between series and systems. The two major unconformities shown on the cross section are at the base of the Pennsylvanian and at the base of the Woodford or the Misener.

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