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Elvins Group - (including Derby-Doerun Dolomite, Davis Formation), Bonneterre Dolomite

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Derby-Doerun Dolomite - alternating thin dolomite, siltstone, and shale; Davis Formation - glauconitic shale with fine - grained sandstone, limestone, and dolomite); Bonneterre Dolomite - dolomite, dolomitic limestone, and limestone; glauconitic in lower part.
State Missouri
Name Elvins Group - (including Derby-Doerun Dolomite, Davis Formation), Bonneterre Dolomite
Geologic age Late Cambrian-Croixian Series
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Incidental
Sedimentary > Clastic > Conglomerate (Bed)
Comments Elvins Group- (including Derby-Doerun Dolomite- (200 ft. max) dolomite with alternating siltstone and shale; Davis FM- (225 ft. max) glauconitic shale with sandstone, limestone and dolomite); Bonnetterre Dolomite- (200 ft. max) dolomite and dolomitic limestone, limestone; glauconitic in lower part, (including Whetstone Creek member- ( 35 ft. max) gray dolomite with shale partings; Sullivan Siltstone- (20 ft. max) siltstone with minor conglomerate. In Southeastern MO- The Bonneterre FM is host to Mississippi Valley type Pb-Zn deposits and Cu, Ni, and Co deposits, at its contact around dome of Precabrian rock in the St. Francois Mtns. The main commodty is lead from galena, sphalerite ore.
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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Counties Bollinger - Camden - Crawford - Iron - Jefferson - Laclede - Madison - Reynolds - Sainte Genevieve - Saint Francois - Washington - Wayne