Chase Group (NEPc;0)

Limestone and shale. Limestone is light gray to dark gray, yellowish gray to pale yellowish brown. Two limestones in the upper part are thin bedded to medium bedded, argillaceous, cherty and fossiliferous; two limestones in the lower part are medium to massive bedded, very cherty, and fossiliferous. Shale is gray, green, red, redish brown, calcareous, arenaceous, fossiliferous; locally fissile. Approx. max thickness 300 ft.

State	Nebraska
Name	Chase Group
Geologic age	Phanerozoic \| Paleozoic \| Permian
Original map label	Pc
Comments	Upper part of Big Blue Series- Includes in decending order: Nolans Limestone, Odell Shale, Winfield Limestone, Gage Shale, Towanda Limestone, Holmesville Shale, Barneston Limestone, Blue Springs Shale, Kinney Limestone, Wymore Shale, and Wreford Limestone.
Primary rock type	limestone
Secondary rock type	shale
Other rock types
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Sedimentary > Carbonate > Limestone (Bed)
Map references	Burchett, R. R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 Million.
Unit references	Burchett, R. R., 1986, Geologic Bedrock Map of Nebraska: Nebraska Geological Survey. Scale 1:1 Million. Burchett, R. R., Dreeszen, V. H., and Reed E. C., 1972, Bedrock Geologic Map Showing Thickness of Overlying Quaternary Deposits, Lincoln Quad. and part of Nebraska City Quad., Nebraska and Kansas: USGS Map I-729. Scale 1:250K.
Geographic coverage	Gage - Jefferson - Johnson - Pawnee - Richardson