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

Geologic units in Stoddard county, Missouri

GULFIAN SERIES (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 10 % of this area

GULFIAN SERIES - Owl Creek Formation - massive, sandy, micaceous, fossilliferous, glauconitic marine clay, max 100 ft. McNairy Formation - unconsolidated sandstone with clay and gravel lenses, max of 250 ft.

Lithology: sandstone; clay or mud; gravel

TERTIARY SYSTEM (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene(?) Oligocene(?) Miocene(?) Pliocene-Early(?) Pliocene-Middle(?) Pliocene-Late) at surface, covers 10 % of this area

TERTIARY SYSTEM - PLIOCENE SERIES - Mounds Gravel (Lafayette Formation) - ferruginous, chert gravel, max of 60 ft. EOCENE SERIES - Wilcox Group - includes Holly Springs Formation - x - bedded sandstone, clay and gravel, max of 1200 ft.; Ackerman Formation - clay with lens of sand and gravel, max of 100ft. PALEOCENE SERIES - Midway Group - includes Porters Creek Clay - bentonitic clay, max of 200 ft.; Clayton Formation - marl, fossiliferous, calcareous, limonitic, glauconitic sand and clay, max of 20 ft.,

Lithology: sandstone; clay or mud; gravel; sand

HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 77 % of this area

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

Lithology: clay or mud; silt; sand; gravel

SMITHVILLE DOLOMITE, POWELL DOLOMITE, COTTER DOLOMITE, JEFFERSON CITY DOLOMITE (Phanerozoic | Paleozoic | Ordovician-Early [Ibexian]) at surface, covers 2 % 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