Hoffman Dome (New Name)

Old Name: Hoffman Anticline

Location

T1N, R2W, Clinton County (H-5)

References

Shaw 1915a, Kay 1915, St. Clair 1917c, Bell 1926a, b

Description

Previous researchers used the name Hoffman Anticline for a structural high, which they interpreted from well data on the Herrin Coal Member. The Hoffman Oil Field was discovered in 1939 and produces from lower Chesterian sandstones. Structure maps of the Beech Creek ("Barlow") Limestone (ISGS open files) for the area reveal a roughly circular, symmetrical dome. It is about 1.5 miles (2.5 km) in diameter and has about 25 feet (8 m) of closure. The name of the structure, therefore, should be changed from Hoffman Anticline to Hoffman Dome.