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Topo

Rock Formations

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Topo

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Temperature

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Fairmont Shale (OKPfa;0)

Geologic Formation in OK, KS

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Lithology

Shale

Siltstone

Geologic Age

Permian (299.05 Ma – 252.23 Ma ago)

Geologic Unit Label

Pfa

WOODWARD- Red-brown blocky shale with some greenish-gray calcitic siltstones. Thickness ranges up to 160 feet. ENID- Mainly red-brown shale with many thin layers of calcitic siltstone in upper 60 feet (18 m). Thickness, about 150 feet (45 m). (Hennessey Group) OKLAHOMA CITY- Red-brown blocky shale; grades into “Garber Sandstone” at base. Thickness, 30 feet at Oklahoma City, 110 feet near Purcell, and 120 feet near Kingfisher. (Hennessey Group) ARDMORE-SHERMAN- Shale, red-brown, blocky; thickness, 40 to 80 feet, decreasing southward. (Hennessey Group).

— USGS

Taxonomy

Classified As

Geologic Formation