Portage Syncline

Part of the Upper Mississippi Valley Zinc-Lead District

Location

Sections 35 and 36, T28N, R1W, Jo Daviess County (A-3)

References

Willman and Reynolds 1947

Description

Mapping of this subtle feature was based on scattered outcrop data. The axis strikes N60°E and the southeastern limb has greater relief. Willman and Reynolds (1947) stated that the Portage Syncline structure could be considered a monocline interrupting the regional southward dip.