Dowell Fault Zone

Location

T7S, R1W, Jackson County, and T6S, R1W, Perry County (I,J-5)

References

Nelson and Krausse 1981, Nelson 1981

Description

The Dowell Fault Zone consists of a series of high-angle normal faults encountered in underground coal mines on the east-dipping limb of the Du Quoin Monocline. The faults strike parallel to the monocline, and most of them have the west side downthrown (fig. 31). Maximum displacement is about 40 feet (12 m). The Dowell Fault Zone may be a southward extension of the Centralia Fault Zone.

See also CENTRALIA FAULT ZONE and DU QUOIN MONOCLINE.

Figure(s)

Figure 32   Seismic reflection profile across the Du Quoin Monocline and the Salem Anticline. From Heigold and Oltz 1991. Figure 33   Cross section of the Du Quoin Monocline is based on well data from Washington and Jefferson Counties. Early Pennsylvanian development of the structure is indicated by loss of relief upward from Mississippian strata to the Colchester Coal. The monocline continued to rise slowly during and after the Pennsylvanian Period. Sandstones are shaded. See fig. 31 for location.