Farmington Anticline

Part of the Peoria Folds

Location

Peoria, Knox, and Fulton Counties (D-3, 4)

References

Wanless 1957

Description

The Farmington Anticline is about 30 miles (48 km) long and strikes slightly north of east. Like many of the Peoria Folds, the Farmington Anticline has greater relief and becomes more asymmetrical in deeper strata. Structural relief is about 70 feet (20 m) on the Springfield Coal Member, and both limbs have roughly equal dip. The north limb has relief of 50 feet (15 m) on pre-Pennsylvanian horizons; the south limb has 150 to 200 feet ( 45-60 m).