Galena Syncline

Part of the Upper Mississippi Valley Zinc-Lead District

Location

Northwestern Jo Daviess County (A-3)

References

Shaw and Trowbridge 1916, Willman and Reynolds 1947, Bradbury et al. 1956

Description

The Galena Syncline has been traced about 12 miles (19 km) in Illinois. It extends northeastward into Wisconsin and westward into Iowa. Its axis is sinuous; dips on both limbs are gentle and appear to be approximately equal. The maximum structural relief is about 50 feet (15 m). It is the largest named structure in the Illinois portion of the Upper Mississippi Valley Zinc-Lead District.