Geologic units in Elk county, Kansas

Shawnee Group (Late Pennsylvanian- Virgilian) at surface, covers 36 % of this area

Includes: Topeka Limestone, Calhoun Shale, Deer Creek Limestone (base DC), Tecumseh Shale, Lecompton Limestone (base LC), Kanwaka Shale, Oread Limestone with Plattsmouth Limestone Member (base PL).

Wabaunsee Group (Late Pennsylvanian- Virgilian) at surface, covers 31 % 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.

Douglas Group (Late Pennsylvanian- Virgilian) at surface, covers 13 % of this area

Lawrence FM (base LA)- mostly gray shale and sandstone with minor red shale, coal, gray limestone and conglomerate, thickness ranges from 140ft to 250 ft. Stranger FM- five members containing sandstone, shale, and minor limestone, coal and conglomerate ranging from 100 ft. to 180 ft. thickness.

Admire Group (Late Pennsylvanian) at surface, covers 11 % 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.

Alluvium (Holocene to Pleistocene) at surface, covers 5 % of this area

unconsolidated sand, silt, clay, and gravel

Council Grove Group (Early Permian Gearyan) at surface, covers 4 % 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.

Chase Group (Early Permian - Gearyan) at surface, covers 0.5 % 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 (Pleistocene) at surface, covers 0.2 % of this area

unconsolidated sand, silt, clay, and gravel