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Osagean Series

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Keokuk Limestone, Burlington Limestone, Elsey Formation, Reeds Spring Formation, Pierson Limestone, Fern Glen Formation.
State Missouri
Name Osagean Series
Geologic age Early Mississippian-Osagean Series
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Minor
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Sedimentary > Clastic > Mudstone > Shale (Bed)
Comments Keokuk Limestone- (100 ft. max) limestone with chert nodules, including Short Creek Oolite member- (8 ft. max) oolitic limestone; Burlington Limestone- (70 ft. max) white fossiliferous limestone with chert nodules; Elesey FM (or Grand Falls FM) (100 ft. max) gray limestone with chert nodules; Reeds Spring FM- (225 ft. max) alternating bands of dolomitic limestone with chert nodules; Pierson Limestone- (60 ft. max) dolomite and dolomitic limestone with chert nodules; Fern Glen FM- (45 ft. max) red limestone with some red calcareous, fossiliferous shale. The Keokuk Limestone and parts of the Reeds Springs FM are host to Mississippi Valley type Pb-Zn deposits in the Tri State District. The major commodity is zinc, from sphalerite, galena ore. IN SOUTHWEST MO-Keokuk Limestone, Burlington Limestone, Elesey FM, Reeds Spring FM, Pierson Limestone. IN CENTRAL MO- Keokuk Limestone, Burlington Limestone, Pierson Limestone. IN NORTHEAST MO- Keokuk Limestone, Burlington Limestone. IN EAST-CENTRAL MO- Keokuk Limestone, Burlington Limeston, Fern Glen FM. IN SOUTHEAST MO- Keokuk Limestone, Burlington Limeston, Fern Glen FM.
References

Howe, W.B. and Koenig, 1961, The Stratigraphic Succession in Missouri: Missouri Geological Survey and Water Resources, Vol XL. 2nd Series.
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