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The AAPG/Datapages Combined Publications Database
Tulsa Geological Society
Abstract
Stratigraphy and Depositional Environments of the Pawnee Limestone, Middle Pennsylvanian (Desmoinesian), in Mid-Continent North America and Equivalent Strata (Oologah Limestone) in Northern Oklahoma
Abstract
The Pawnee Limestone represents a major cyclic depositional sequence in which rapid transgression deposited thin carbonate (Childers School Limestone) and shale (Anna Shale Member), and slower interrupted regression deposited thicker carbonate (Myrick Station Limestone and Laberdie-Coal City Limestone) and clastic (Mine Creek Shale) sequences. Maximum transgression culminated in deposition of the widespread marine black, fissile and phosphatic Anna Shale. The Pawnee regressive sequence is interrupted by a second, although minor, transgression at the end of Mine Creek Shale deposition.
In addition to sea-level oscillations, sea-floor topography, including the "Shelf Edge Rise," Bourbon arch, Saline County arch, Lincoln Fold Complex, and intervening basins strongly affected sedimentation patterns during Pawnee deposition. Algal mounds are generally restricted to topographic highs, whereas significant coal formation is restricted to intervening lows.
The Sageeyah Limestone, a member of the Labette Shale below the Pawnee, makes up the lower one-half of the Oologah Formation of Oklahoma, whereas the Pawnee makes up the upper one-half. This corrects previous miscorrelations which had Pawnee Limestone forming the lower half of the Oologah and the overlying Altamont Limestone forming the upper half. The thin Altamont Limestone is recognized above the Oologah in the Tulsa area.
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