Pierre Shale--Middle unit (COKpm;0)

In Boulder-Fort Collins area, contains Richard, Larimer, Rocky Ridge, Terry, and Hygiene Sandstone Members; elsewhere shale between zones of Baculites reesidei and B. scotti

State	Colorado
Name	Pierre Shale--Middle unit
Geologic age	Phanerozoic \| Mesozoic \| Cretaceous
Original map label	Kpm
Primary rock type	shale
Secondary rock type	sandstone
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale Minor Sedimentary > Clastic > Sandstone
Map references	Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references	Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverage	Boulder - Cheyenne - Crowley - Douglas - El Paso - Fremont - Jefferson - Kiowa - Kit Carson - Larimer - Lincoln - Pueblo