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Whitewood Limestone, Winnipeg Formation, and Deadwood Formation (SDOCAwd;0)

Geologic Formation in SD, WY

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Lithology

Conglomerate

Shale

Sandstone

Other (393 mi²)

Geologic Age

Middle Cambrian – Late Ordovician (521 Ma – 445.3 Ma ago)

Geologic Unit Label

OCAwd

Whitewood Limestone (Ordovician)- Mottled, tan, gray to lavender, fine- to medium-crystalline, sparsely fossiliferous limestone and dolomite. Thickness up to 70 ft (21 m). Winnipeg Formation (Ordovician)- Grat and light-green, fissile shale, and tan, calcareous siltstone, sandy shale, and limestone lenses. Thickness up to 110 ft (34 m). Deadwood Formation (Ordovician to Cambrian)- Variegated, yellow to red, brown, gray, and green, glauconitic, conglomerate, sandstone, shale, dolomitic limestone, and dolomite. Thickness 4-400 ft (1-122 m).

— USGS

Taxonomy

Classified As

Geologic Formation