Lake Bloomington Dome

Location

T26N, R2 and 3E, McLean County (D-6)

References

Clegg 1972, Buschbach and Bond 1974

Description

The Lake Bloomington Dome lies along the Downs Anticline, which marks the west edge of the La Salle Anticlinorium in this area. It is about 4.5 miles (7 km) long (north to south) and 3 miles (4.5 km) wide. The Gridley and Lexington Domes can be regarded as offshoots (fig. 25). The Lake Bloomington Dome proper has about 60 feet (18 m) of closure on the Pennsylvanian Danville Coal Member (Clegg 1972) and about 100 feet (30 m) on the Cambrian Mt. Simon Sandstone (Buschbach and Bond 1974). A gas storage field has been developed in the Mt. Simon.

See also HUDSON DOME.

Figure(s)

Figure 25   Cooksville Anticline and Hudson, Lake Bloomington, and Lexington Domes, McLean County. Black lines are structure contours (ft) on top of the Upper Cambrian Mt. Simon Sandstone. Red lines are residual gravity isogals. From Heigold et al. 1964.