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Geologic units in Saint Louis county, Missouri

MARMATON GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers 37 % of this area

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

HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 25 % of this area

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

Lithology: clay or mud; silt; sand; gravel

MERAMECIAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late [Meramecian]) at surface, covers 16 % of this area

MERAMECIAN SERIES - ST. LOUIS LIMESTONE, SALEM FORMATION, WARSAW FORMATION

Lithology: limestone

PLEASANTON GROUP (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Upper Missourian]) at surface, covers 11 % of this area

PLEASANTON GROUP - dominantly shale and sandstone with minor coal.

Lithology: shale; sandstone; coal

ST. PETER SANDSTONE, EVERTON FORMATION (Phanerozoic | Paleozoic | Ordovician-Early Ordovician-Middle) at surface, covers 4 % of this area

ST. PETER SANDSTONE, EVERTON FORMATION

DEVONIAN SYSTEM (Phanerozoic | Paleozoic | Devonian-Early Devonian-Middle(?) Devonian-Late) at surface, covers 2 % of this area

DEVONIAN SYSTEM - CHATTANOOGA SHALE, SYLAMORE SANDSTONE, FORTUNE FORMATION, HOLTS SUMMIT SANDSTONE, SNYDER CREEK SHALE, CEDAR VALLEY LIMESTONE, LOUISIANA LIMESTONE, SAVERTON SHALE, GRASSY CREEK SHALE, TURPIN SANDSTONE, BUSHBERG SANDSTONE, GLEN PARK LIMESTONE, St. LARENT LIMESTONE, BEAUVAIS SANDSTONE, GRAND TOWER LIMESTONE, CLEAR CREEK CHERT, LITTLE SALINE LIMESTONE, GRASSY KNOB CHERT, BAILEY FORMATION

CHEROKEE GROUP- Cabaniss Subgroup, Krebs Subgroup (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Middle Desmonian]) at surface, covers 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

LEEMON FORMATION, MAQUOKETA GROUP, CAPE LIMESTONE, KIMMSWICK LIMESTONE, NOIX-CYRENE LIMESTONE, MAQUOKETA SHALE (Phanerozoic | Paleozoic | Ordovician-Middle Ordovician-Late) at surface, covers 1 % of this area

LEEMON FORMATION, MAQUOKETA GROUP INCLUDING: (GIRARDEAU LIMESTONE, ORCHARD CREEK SHALE, THEBES SANDSTONE, CAPE La CROIX SHALE), CAPE LIMESTONE, KIMMSWICK LIMESTONE, NOIX - CYRENE LIMESTONE, MAQUOKETA SHALE

Lithology: limestone; shale; sandstone

JOACHIM DOLOMITE, DUTCHTOWN FORMATION (Phanerozoic | Paleozoic | Ordovician-Middle [Mohawkian]) at surface, covers 0.9 % of this area

JOACHIM DOLOMITE, DUTCHTOWN FORMATION

OSAGEAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Osagean]) at surface, covers 0.9 % of this area

OSAGEAN SERIES - KEOKUK LIMESTONE, BURLINGTON LIMESTONE, ELSEY FORMATION, REEDS SPRING FORMATION, PIERSON LIMESTONE, FERN GLEN FORMATION

KINDERHOOKIAN SERIES (Phanerozoic | Paleozoic | Carboniferous Mississippian-Early [Kinderhookian]) at surface, covers 0.6 % of this area

KINDERHOOKIAN SERIES - NORTHVIEW SHALE, SEDALIA FORMATION, COMPTON LIMESTONE, BACHELOR FORMATION CHOUTEAU GROUP, HANNIBAL SHALE, HORTON CREEK LIMESTONE

DECORAH GROUP, PLATTIN GROUP (Phanerozoic | Paleozoic | Ordovician-Middle [Mohawkian]) at surface, covers 0.5 % of this area

DECORAH GROUP, PLATTIN GROUP

Lithology: limestone; shale

PENNSYLVANIAN UNDIFFERENTIATED (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area

PENNSYLVANIAN UNDIFFERENTIATED

Lithology: shale; limestone; sandstone; coal

SILURIAN SYSTEM (Phanerozoic | Paleozoic | Silurian-Early Silurian-Middle(?) Silurian-Late) at surface, covers < 0.1 % of this area

SILURIAN SYSTEM - JOLIET LIMESTONE, BOWLING GREEN DOLOMITE, BRYANT KNOB FORMATION, BAINBRIDGE FORMATION, SEXTON CREEK LIMESTONE

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series (Mississippian) at surface, covers < 0.1 % of this area

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series