Oglesby Fault (Discarded)

Location

North-central Illinois

References

Green 1957

Description

The Oglesby Fault appears in Green's paper that treated aspects of the structural geology of Ohio, Indiana, and Illinois. Green interpreted the western, steep limb of the La Salle Anticlinorium as being faulted along most of its length. The Oglesby Fault was shown as extending approximately from Lee County on the north to McLean County on the south. Green stated that the fault had a maximum displacement of about 1,200 feet (360 m) between closely spaced drill holes near La Salle. Green (1957) provided no details; his interpretations were not accepted by Bristol and Buschbach (1973) on their statewide structure map of the Galena Group (Trenton). Faulting at depth has been documented at several places along the La Salle Anticlinorium, and it is probable that faults occur along parts of Green's Oglesby Fault. Available data do not permit interpretation of a continuous fault in this area.

See also TUSCOLA FAULT (discarded).