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Mineral Resources > Online Spatial Data > Geology > by state > Kansas Geology

Geologic units in Rush county, Kansas

Alluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.4 % of this area

unconsolidated sand, silt, clay, and gravel

Lithology: gravel; sand; silt; clay or mud

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 3 % of this area

massive to cross-bedded, generally arkosic sand, silt and gravel, locally cemented with calcium carbonate; also contains limestone, volcanic ash, diatomaceous marl, opaline sandstone and bentonitic clay

Lithology: arkose; limestone; volcanic ash; carbonate; sandstone; claystone

Alluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 17 % of this area

unconsolidated sand, silt, clay, and gravel

Lithology: gravel; sand; silt; clay or mud

Loess (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 26 % of this area

eolian silts

Lithology: silt

Carlile Shale (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 33 % of this area

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

Lithology: shale; limestone; sandstone

Niobrara Chalk (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.1 % of this area

interbedded, soft, light-gray calcareous shale and chalk

Lithology: shale; limestone

Greenhorn Limestone and Graneros Shale (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 20 % 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.

Lithology: limestone; shale; sandstone; siltstone