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

Geologic units in Davis county, Iowa

CHEROKEE GROUP- Cabaniss Subgroup, Krebs Subgroup (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers < 0.1 % of this area

CHEROKEE GROUP - Cabaniss Subgroup - cyclic deposits, shale, sandstone, clay and several workable coal beds. Krebs Subgroup - cyclic deposits, sandstone, siltstone, shale, clay and some workable coal beds

Lithology: shale; sandstone; siltstone; clay or mud; limestone; coal

MARMATON GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers < 0.1 % of this area

MARMATON GROUP - cyclic deposits, shale and limestone with sandstone, clay and several coal beds, some workable

Lithology: limestone; shale; sandstone; clay or mud; coal

Cherokee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers 83 % of this area

Cyclic deposits with carbonaceous shale, clay, siltstone, with lesser sandstone, and thick coal beds; minor but persistent limestone beds; may include parts of Atoka or Morrow Series.

Lithology: shale; claystone; siltstone; sandstone; coal; limestone

Marmaton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers 2 % of this area

Alternating shale and limestone, with some sandstone and coal; Lenapah FM at top and Fort Scott at base.

Lithology: shale; limestone; sandstone; coal

Meramec Series (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late) at surface, covers 15 % of this area

Ste. Genevieve Limestone- fossiliferous limestone and red and green shale. Approx. thickness 50 ft. St. Louis Limestone- limestone and dolomite, sandstone locally perdominant; locally contains chert. Spergen Formation- sandy micaceous dolomite.

Lithology: limestone; dolostone (dolomite); shale; sandstone; chert