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Savanna Formation (OKPAsa;0)

Geologic Formation in OK, AR, KS

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Lithology

Coal

Coal

Limestone

Other (1,703 mi²)

Geologic Age

Pennsylvanian (323.6 Ma – 299.05 Ma ago)

Geologic Unit Label

PAsa

TULSA- “Savanna Formation,” shale and thin sandstone, limestone, and coal. FORT SMITH- IPsa “Savanna Formation,” shale, sandstone, and coal ARDMORE-SHERMAN- Sandstone and shale, gray to brown, fine- to coarse-grained, cherty, with several thin coal seams near middle; thickness, 1,120 to 1,600 feet (Lower Franks Conglomerate) McALESTER TEXARKANA- Shale, tan to brown, illitic, chloritic, and sandstone, fine-to coarse-grained, micaceous, quartzose, with several thin coal seams in middle, one of which is “Cavanal coal;” thickness, 1,470 to 2,000 feet, increasing eastward.

— USGS

Taxonomy

Classified As

Geologic Formation