Geologic units in Atchison county, Kansas

Drift (Pleistocene) at surface, covers 60 % of this area

sand, silt, clay, and some gravel

Shawnee Group (Late Pennsylvanian- Virgilian) at surface, covers 16 % 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 11 % 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 (Holocene to Pleistocene) at surface, covers 10 % of this area

unconsolidated sand, silt, clay, and gravel

Douglas Group (Late Pennsylvanian- Virgilian) at surface, covers 2 % 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.

Loess (Holocene to Pleistocene) at surface, covers 0.8 % of this area

eolian silts

Holocene series (Quaternary-Holocene Series) at surface, covers 0.2 % of this area

Alluvium - clay, silt, sand, and gravel.