Interstate Fault Zone (New Name)

Part of the Fluorspar Area Fault Complex
Old Name: Interstate Fault

Location

West-central T12S, R8E, Hardin County (pl. 2)

References

Baxter and Desborough 1965

Description

The Interstate Fault Zone structure was initially named the Interstate Fault, but it is a fault zone composed of multiple, subparallel fractures along the northwest side of the Rock Creek Graben. The southeast side is downthrown more than 2,000 feet (610 m) in places, juxtaposing Pennsylvanian strata against St. Louis Limestone.

Figure(s)

Figure 34   Structure of top of the Springfield Coal Member in the central part of Eagle Valley Syncline. Contour interval is 5O feet inside coal outcrop and 100 feet elsewhere (Nelson and Lumm 1987). Plate 2   Fluorspar Area Fault Complex and Shawneetown Fault Zone