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

Geologic units in Ripley county, Missouri

Cotter and Jefferson City Dolomites (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers 0.3 % of this area

Cotter and Jefferson City Dolomites

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

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

Alluvial deposits of local streams or of overbank flow of major streams - In some areas includes deposits in abandoned meanders of major streams

Lithology: alluvium

Dune sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers < 0.1 % of this area

Dune sand - Deposited mostly on terrace deposits of the second level. Younger than some terrace deposits, older than others

Lithology: dune sand

SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 46 % of this area

SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE - fine crystalline, silty, cherty dolomite, and oolitic chert with local sandstone beds

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

Alluvium and terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

Alluvium and terrace deposits - Alluvial deposits of present streams and on one or more terrace levels

Lithology: alluvium; alluvial terrace

GASCONADE DOLOMITE (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 5 % of this area

GASCONADE DOLOMITE - coarse - crystalline cherty dolomite with a basal Gunter Sandstone Member.

Lithology: dolostone (dolomite); sandstone

ROUBIDOUX FORMATION (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 42 % of this area

ROUBIDOUX FORMATION - sandstone, chert and interbedded dolomite

Lithology: sandstone; chert; dolostone (dolomite)

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 0.1 % of this area

Terrace deposits - Alluvial deposits on one or more terrace levels

Lithology: alluvial terrace

Sand and clay (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Sand and clay

Lithology: sand; clay or mud

HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 7 % of this area

HOLOCENE SERIES - Alluvium - clay, silt, sand, and gravel

Lithology: clay or mud; silt; sand; gravel