Geologic units in Russell county, Kansas

Greenhorn Limestone and Graneros Shale (Late Cretaceous) at surface, covers 34 % of this area

Greenhorn FM- thin bedded gray, chalky limestone and calcareous shale. Graneros Shale- fissile, noncalcareous, gray shale locally contains sandstone and siltstone beds.

Loess (Holocene to Pleistocene) at surface, covers 22 % of this area

eolian silts

Carlile Shale (Late Cretaceous) at surface, covers 16 % of this area

Chalky shale with bentonite and thick chalk beds, dark gray fissile shale containing septarian concretions, and fine-grained sandstone.

Dakota Formation (Early Cretaceous) at surface, covers 12 % of this area

White, gray, red, brown and tan kaolinitic claystone, mudstone, shale and siltstone interbedded with grayish to yellowish brown thick lenticular sandstone beds. It also contains lignite and sandstone is commonly well cemented with iron oxide and calcite.

Alluvium (Holocene to Pleistocene) at surface, covers 9 % of this area

unconsolidated sand, silt, clay, and gravel

Alluvium (Pleistocene) at surface, covers 7 % of this area

unconsolidated sand, silt, clay, and gravel

Niobrara Chalk (Late Cretaceous) at surface, covers 0.1 % of this area

Interbedded, soft, light-gray calcareous shale and chalk