Extension Fault (Discarded)

Part of the Fluorspar Area Fault Complex

Location

Section 5, T13S, R8E, Hardin County

References

J. Weller et al. 1952, Baxter and Desborough 1965

Description

The authors cited above mentioned the Extension Fault briefly and stated that this name was sometimes given to the southern part of the Rosiclare Fault. The name was apparently derived from the abandoned Extension Mine, which was developed in fluorspar veins along the fault. Giving separate names to different parts of the same structure causes confusion, particularly in a region of complex structure. The name Extension Fault should therefore be suppressed in favor of Rosiclare Fault.