Geologic units in Coffey county, Kansas

Shawnee Group (Late Pennsylvanian- Virgilian) at surface, covers 56 % 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).

Alluvium (Holocene to Pleistocene) at surface, covers 17 % of this area

unconsolidated sand, silt, clay, and gravel

Douglas Group (Late Pennsylvanian- Virgilian) at surface, covers 12 % 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.

Wabaunsee Group (Late Pennsylvanian- Virgilian) at surface, covers 10 % 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.

Alluvium (Tertiary) at surface, covers 4 % of this area

largely chert gravel

Alluvium (Pleistocene) at surface, covers < 0.1 % of this area

unconsolidated sand, silt, clay, and gravel