Dahlgren Anticline

Location

T3S, R5E, Hamilton County (I-6)

References

Rolley 1951

Description

The Dahlgren Anticline was named by Rolley (1951). Her structure map of the top of the Herrin Coal Member (Pennsylvanian) shows a northeast-trending anticline about 2 miles (3.2 km) long and 1 mile (1.6 km) wide; it has at least 25 feet (8 m) of closure. Rolley's coal structure map was based on information gathered from closely spaced drill holes. On the deeper Beech Creek ("Bulow") Limestone and Karnak Limestone Member (ISGS open files), the Dahlgren Anticline lacks mapped closure, but nosing of contour lines to the southeast is evident.