Herscher-Northwest Anticline (New)

Part of the La Salle Anticlinorium

Location

T30 and 31N, R9E, Kankakee County (C-7)

References

Buschbach and Bond 1967, 1974, Bristol and Buschbach 1973

Description

The name Herscher-Northwest Anticline is used for the structure at the Herscher-Northwest gas storage project (Buschbach and Bond 1974). The structure was not listed by Treworgy (1981). As mapped from subsurface data on top of the Cambrian Mt. Simon Sandstone, the area of closure on the doubly plunging anticline is slightly more than 3 miles (5 km) long and approximately 1.5 miles (2.4 km) wide. The anticline has a long axis that trends north-northwest and is more than 6 miles (9.5 km) long. It is asymmetrical and steeper on the west limb. Closure is 58 feet (17.7 m) on top of the Mt. Simon (Buschbach and Bond 1974). The Herscher and Herscher- Northwest Anticlines lie more or less en echelon with approximately 2 miles (3 km) of offset on their axes. The anticlines are separated by a syncline that plunges toward the south-southwest.