Crescent City Anticline (New Name)

Old Name: Crescent City Dome

Location

Central Iroquois County (D-8)

References

Bell 1961, Buschbach and Bond 1974

Description

Bell (1961) named this structure a dome, but it is better called an anticline because its length is twice its width and it has a well defined axis. The Crescent City Anticline was delineated by drilling for gas storage. Buschbach and Bond's (1974) map shows at least 120 feet (36 m) of closure covering roughly 25 square miles (65 km2) on the top of the Cambrian Mt. Simon Sandstone. The axis trends southeast, and the northeast limb is much steeper than the southwest limb.

Bristol and Buschbach's (1973} structure contour map of the top of the Galena Group (Ordovician) depicts anticlinal nosing that extends southward from the Crescent City Anticline into central Vermilion County. The name Crescent City Anticline is here restricted to the area of closure. At first glance the Crescent City Anticline appears to be an isolated structure; however, its trend and asymmetry are similar to those of the Ancona Anticline and the Sandwich Fault Zone. }