Outcrop Stratigraphy and Depositional Facies of the Chase Group (Permian, Wolfcampian) in Kansas and Southeastern Nebraska S.J. Mazzullo, C.S. Teal, C.A. Burtnett Technical Series 6 1997 210 pages, 91 figures, 155 measured sections
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Abstract

1. the base of the Schroyer Member of the Wreford Limestone is consistantly placed at the base of the cherty limestone section that variously overlies either shale or a thick section of non-cherty limestones in the upper Havensville Member;
2. reinstatement of the name Bruno limestone in reference to a stratigraphically significant carbonate zone within the Blue Springs Member of the Matfield Shale;
3. the Blue Springs-Florence contact is placed at the base of a regionally persistent section of non-cherty limestone and minor interbedded shale in the basal Florence;
4. abandonment of the Barneston Limestone, and elevation of the Florence and Fort Riley each to formation status;
5. recognition of the Cole Creek Member (new name) in reference to the section of non-cherty limestones, and locally, interbedded shales in the basal part of the Florence Formation.
6. inclusion of the Oketo Shale as the upper member of the Florence Formation;
7. recognition that the Gage Member of the Doyle Shale is present in southern Kansas;
8. recognition in south-central Kansas of non-cherty Santa Fe Lake Member (new name) of the Winfield Limestone as the stratigraphic equivalent of the basal, cherty Stoval Member present in central and northern Kansas;
9. reinstatement of the Luta as the upper member of the Winfield Limestone (thus extracting it from its present inclusion within the Cresswell Member); and
10. recognition that the Cresswell Member of the Winfield Limestone is absent by nondeposition in northern Kansas and Nebraska, where instead, only the Stoval, Grant, and Luta Members compose the formation.

The stratigraphy of the Chase Group defines a hierarchal framework of third-order to progressively higher-frequency, fifth- or sixth-order cycles that document the combined effects of glacio-eustatic forcing, regional to local tectonism along the still-active Nemaha Ridge, and autogenic controls on deposition. Classic midcontinent cyclothems are represented by the fourth or fifth-order cycles in Chase Group strata.