Geologic units in Clay county, Missouri

Kansas City Group (Late Pennsylvanian-Upper Series-Missourian Stage) at surface, covers 67 % of this area

Cyclic deposits, limestone and shale with minor sandstone and coal.

Lansing Group (Late Pennsylvanian-Upper Series-Missourian Stage) at surface, covers 18 % of this area

Cyclic deposits of limestone and shale.

Holocene series (Quaternary-Holocene Series) at surface, covers 12 % of this area

Alluvium - clay, silt, sand, and gravel.

Pleasanton Group (Late Pennsylvanian-Upper Series-Missourian Stage) at surface, covers 2 % of this area

Dominantly shale and sandstone with minor coal.

Douglas Group (Late Pennsylvanian-Upper Series-Virgilian Stage) at surface, covers 2 % of this area

Cyclic deposits, dominantly shale with sandstone, and limestone.

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

unconsolidated sand, silt, clay, and gravel