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Scotch Grove Formation

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Formation includes Welton, Buck Creek Quarry, Waubeek, Palisades-Kepler, Johns Creek Quarry members; Palisades-Kepler and Johns Creek Quarry members contain carbonate mound facies. Erosionally beveled and truncated beneath Dw. Primarily Lithologies: dolomite, porous, fossil-moldic to vuggy, part very crinoidal (includes Welton Mbr); dolomite, cherty to very cherty, dense (Buck Creek Quarry Mbr). Secondary Lithologies: dolomite, sparsely fossil-moldic, dense, part vuggy (includes Waubeek Mbr); dolomite, coarsely crystalline, part very crinoidal (within Johns Creek Quarry, Palisades-Kepler mbrs); dolomite mudstone, dense. Minor: dolomite, slightly argillaceous; quartz druse, chalcedony, silicified fossils. Maximum thicknesses: 94-240 ft (29-73 m); may reach thicknesses to 300 ft (90 m); beveled and truncated beneath Dw.
State Iowa
Name Scotch Grove Formation
Geologic age Lower Silurian, upper Llandovery-lower Wenlock
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone (Bed)porous, fossil-moldic to vuggy, part very crinoidal (includes Welton Mbr); cherty to very cherty, dense (Buck Creek Quarry Mbr); minor sparsely fossil-moldic, dense, part vuggy (includes Waubeek Mbr); minor coarsely crystalline, part very crinoidal (within Johns Creek Quarry, Palisades-Kepler mbrs); incidental slightly argillaceous
Minor
Sedimentary > Clastic > Mudstone (Bed)dolomite mudstone, dense
References

Witzke, Brian J., Anderson, Raymond R., and Pope, John P., 2010, Iowa Geological and Water Survey, DNR, Bedrock Geologic Map of Iowa, OFM-2010-1. Scale 1:500,000.
NGMDB product
Counties Benton - Buchanan - Cedar - Clayton - Clinton - Delaware - Dubuque - Jackson - Johnson - Jones - Linn - Muscatine - Scott