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Fowkes Formation

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FOWKES FORMATION--Light-colored tuffaceous sandstone and siltstone, locally conglomeratic. Locally designated by some as Norwood Tuff.
State Wyoming
Name Fowkes Formation
Geologic age Phanerozoic | Cenozoic | Tertiary | Eocene
Comments Upper part may be as young as Pliocene, according to COMU unit description. COMU box stops with a ? at Eocene/Oligocene boundary.
Primary rock type fine-grained mixed clastic
Secondary rock type medium-grained mixed clastic
Other rock types mixed clastic/volcanic
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Siltstone (Tuffaceous)
Minor
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Igneous > Volcanic (Pyroclastic, tuff)
Map references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Unit references
Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey.
Counties Lincoln - Uinta