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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Oswego is the oldest and most widespread limestone unit of the Marmaton Group. The Marmaton is the oldest succession of Pennsylvanian carbonates that are indigenous to the shelf area of the western Mid-Continent.
The Oswego Limestone occurs over most of northern Oklahoma and southeastern Kansas, where it sometimes attains a thickness in excess of 100 ft. The Oswego is developed as a shelf limestone unit. Southward, it grades into a basin shale. The gradation from shelf limestone to basin shale occurs in a zone that is usually from 2-4 mi. wide. Within this transitional band, "reef-like" limestone banks occur. Some of the limestone banks have become reservoirs for large oil and gas accumulations.
A regional facies change of the Oswego can be traced from its outcrop east of Tulsa into the subsurface west to the Oklahoma panhandle. This facies change in eastern Oklahoma parallels the Arkoma basin. It intersects the Nemaha ridge south of Oklahoma City and, west of Oklahoma City, it parallels the Anadarko basin. In Ellis County, it swings abruptly northward.
A regional study of the transitional zone explains the location of such fields as Putnam and Kendrick, and may point the way to future oil and gas production.
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