Gower Formation

Formation includes Anamosa, Brady, LeClaire (Scott-Muscatine counties) members; Brady and LeClaire members are carbonate mound facies. Erosionally beveled and truncated beneath Dw. Primary Lithologies: laminated dolomite (Anamosa Mbr), part fetid/organic to east (Scott-Clinton counties); dolomite mudstone, dense, featureless. Secondary Lithologies: dolomite, fossiliferous to vuggy, moldic, part brachiopod-rich (Brady Member); dolomite, part coarsely crystalline, vuggy, fossiliferous to sparsely fossiliferous, part crinoidal (LeClaire Member). Minor: chert; intraclastic dolomite. Maximum thickness: 180 ft (55 m); beveled and truncated beneath Dw.
State Iowa
Name Gower Formation
Geologic age Lower-?Upper Silurian, Wenlock-?Ludlow
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)dolomitic, dense, featureless.
Sedimentary > Carbonate > Dolostone (Bed)laminated (Anamosa Mbr), part fetid/organic to east (Scott-Clinton counties); minor fossiliferous to vuggy, moldic, part brachiopod-rich (Brady Member); minor part coarsely crystalline, vuggy, fossiliferous to sparsely fossiliferous, part crinoidal (LeClaire Member)
Incidental
Sedimentary > Chemical > Chert (Bed)
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 Cedar - Clinton - Jackson - Johnson - Jones - Linn - Muscatine - Scott