Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Iowa Geology
Geologic units in Monroe county, Iowa
- Cherokee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers 93 % 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.
- Marmaton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Des Moines]) at surface, covers 4 % of this area
Alternating shale and limestone, with some sandstone and coal; Lenapah FM at top and Fort Scott at base.
- Meramec Series (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late) at surface, covers 2 % 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.
- Pleasanton Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Missouri]) at surface, covers 0.5 % of this area
Shale with some sandstone, thin limestone beds and minor coal; Exline Limestone near top Chariton Conglomerate at base. .