Hillsboro North Dome (New Name)

Old Name: Hillsboro Dome

Location

Western T8-10N, R3W, Montgomery County (G-5)

References

Buschbach and Bond 1974, Treworgy 1981

Description

Buschbach and Bond (1974) mapped and described a dome near Hillsboro, within which a gas storage reservoir has been developed in the St. Peter Sandstone (Ordovician). As mapped on the top of the St. Peter, this dome is about 3 miles (5 km) north to south, 2 miles east to west, and fairly symmetrical. It has closure of about 100 feet (30 m) on the St. Peter and is centered near the northeast comer of Section 5, T9N, R3W (Buschbach and Bond 1974). Treworgy (1981) listed the strncture as the Hillsboro Dome.

A second dome south of the first is indicated on maps of the top of the Karnak Limestone (Mississippian; Bristol and Howard 1976) and base of the New Albany Group (Upper Devonian; Stevenson et al. 1981, W.F. Meents, undated and unpublished). The map by Meents shows the greatest detail. It shows an elongated dome or anticline that is 5 miles (8 km) north to south, 2 miles (3 km) wide, and has closure of about 60 feet (18 m). The south dome is centered in Section 31, T9N, R3W. The two domes are situated along a terrace on an east-facing monocline. The names Hillsboro North and Hillsboro South are given to the two domes.