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Chickasha Formation (OKPc;0)

Geologic Formation in OK

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Lithology

Conglomerate

Shale

Siltstone

Other (418 mi²)

Geologic Age

Permian (299.05 Ma – 252.23 Ma ago)

Geologic Unit Label

WOODWARD - The “Chickasha Formation” member of Flower Pot Shale (Pc) is a deltaic tongue of red-brown to greenish-gray to orange-brown cross-bedded mudstone conglomerate, siltstone, shale, and fine-grained sandstone, about 30 feet thick, in the middle of the Flowerpot Shale, pinching out northward. CLINTON- “Chickasha Formation,” Pc, reddish-brown to maroon mudstone conglomerate with some shale, silstone, and fine- to coarse-grained sandstone; thickness, about 600 feet; gradational northward and westward into the Flowerpot Shale and the Blaine Formation and westward into Dog Creek Shale. OKLAHOMA CITY-Variegated mudstone conglomerate and red-brown to orange- brown silty shale and siltstone, with minor amounts of orange-brown fine-grained sandstone; upper part grades northward into “Dog Creek Shale”, “Blaine Formation”, “Flowerpot Shale”, and upper part of “Cedar Hills Sandstone”; lower part grades into “Duncan Sandstone”. Thickness, about 100 feet near Chickasha and 300 feet near Okarche. (El Reno Group) ARDMORE-SHERMAN- Mudstone conglomerate, siltstone, and sandstone, red-brown; thickness, 100 to 200 feet, decreasing southeastward. (El Reno Group).

— USGS