Lower Miocene and Upper Oligocene rocks, or Rocks equivalent to Upper and Lower Miocene AND White River Formation (WYTmo;0)

LOWER MIOCENE AND UPPER OLIGOCENE ROCKS--Light-colored soft porous sandstone and underlying white tuffaceous claystone and siltstone. Arikaree Formation in Denver Basin; ROCKS EQUIVALENT TO UPPER AND LOWER MIOCENE ROCKS AND WHITE RIVER FORMATION--Light-colored sandstone, white tuffaceous blocky claystone, and siltstone. Black Hills.

State	Wyoming
Name	Lower Miocene and Upper Oligocene rocks, or Rocks equivalent to Upper and Lower Miocene AND White River Formation
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Oligocene-Late Miocene-Early(?) Miocene-Middle(?) Miocene-Late
Original map label	Tmo
Primary rock type	fine-grained mixed clastic
Secondary rock type	mixed clastic/volcanic
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Conglomerate Sedimentary > Clastic > Mudstone > Claystone (Tuffaceous) Sedimentary > Clastic > Siltstone Sedimentary > Clastic > Sandstone Incidental Igneous > Volcanic (Pyroclastic, tuff) Igneous > Volcanic (Pyroclastic, tuff)
Map references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Unit references	Love, J.D. and Christiansen, Ann Coe, 1985, Geologic Map of Wyoming: U.S. Geological Survey. [http://pubs.er.usgs.gov/publication/ofr83802]
Geographic coverage	Albany - Converse - Crook - Goshen - Laramie - Niobrara - Platte