Wonewoc Formation

Surface exposures limited to northeastern Allamakee County; subcrops beneath Mississippi River alluvium in Allamakee County. Includes Ironton and Galesville members. Primary lithology: sandstone, fine to coarse grained, upper part fossiliferous (Ironton). Thicknesses: 125-155 ft (38-47 m).
State Iowa
Name Wonewoc Formation
Geologic age Middle-Upper Cambrian, upper Marjuman-Steptoean (formerly upper Dresbachian-lower Franconian)
Lithologic constituents
Sedimentary > Clastic > Sandstone (Bed)fine to coarse grained, upper part fossiliferous (Ironton)

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 Allamakee