Geologic units in Riley county, Kansas

Chase Group (Early Permian - Gearyan) at surface, covers 60 % of this area

Nolans Limestone- upper and lower limestone seperated by shale, 40 ft thick. Odell Shale- mostly red and green shale, 40 ft. thick. Winfield Limestone (base WF)- cherty limestone with fossiliferous gray shale, 25 ft. thick. Doyle Shale- two shale members seperated limestone, 70 ft. thick. Barneston Limestone (base BA)- two thick limestone members seperated by thin limestone, 90 ft. thick: with Fort Riley Limestone Member( base FR)- gray to tan massive to thin bedded limestone with minor gray shale, 45 ft thick. Matfeild Shale- two varicolored shale members seperated by limestone, 80 ft. thick. Wreford Limestone- two cherty limestone members seperated shale, 40 ft. thick.

Alluvium (Holocene to Pleistocene) at surface, covers 14 % of this area

unconsolidated sand, silt, clay, and gravel

Council Grove Group (Early Permian Gearyan) at surface, covers 10 % of this area

Includes: Speiser Shale, Funston Limestone, Blue Rapids Shale, Crouse Limestone (base CS), Easy Creek Shale, Bader Limestone (base BE), Stearns Shale, Beattie Limestone, Eskridge Shale, and Neva Limestone.

Loess (Holocene to Pleistocene) at surface, covers 6 % of this area

eolian silts

Sumner Group (Late Permian - Cimarronian) at surface, covers 5 % of this area

Ninnescah Shale (base N)- mostly red silty shale with some gray shale , argillaceous limestone and dolomite. Wellington FM with Carlton Limestone Member (base CR)-mostly gray and some red shale with minor limestone and dolomite, siltstone, gypsum and anhydrite

Drift (Pleistocene) at surface, covers 4 % of this area

sand, silt, clay, and some gravel

Admire Group (Late Pennsylvanian) at surface, covers 1 % of this area

Includes: Grenola Limestone, Roca Shale, Red Eagle Limestone (base RE), Johnson Shale, Foraker Limestone (base FO), Janesville Shale with Five Point Limestone Member (base FP), Falls City Limestone, and Onaga Shale.

Wabaunsee Group (Late Pennsylvanian- Virgilian) at surface, covers 0.9 % of this area

Includes: Wood Siding FM, Root Shale, Stotler Limestone (base ST), Pillsbury Shale, Zeandale Limestone (base Z), Willard Shale, Emporia Limestone (base E), Auburn Shale, Bern Limestone (base BR), Scranton Shale, Howard Limestone (base H), and Severy Shale.

Kimberlite (Cretaceous) at surface, covers < 0.1 % of this area

Kimberlite