Type locality and use of name in Indiana: The Cohn Coal was introduced by Newton and Weller (1937, p. 18) for exposures in the NE¼ sec. 1, T.11 N., R.12 W., Clark County, Ill., 2 miles (3.2 km) southeast of Cohn (now called Livingston). This coal was later designated the Cohn Coal Member (Kosanke and others, 1960, p. 41) in Illinois. It was accepted by Wier (1961, 1965) as a member of the Mattoon Formation in Indiana.
Description: The Cohn Coal Member is 2 inches (< 0.1 m) thick in the type area and is 20 feet (6 m) above the top of the Livingston Limestone Member of the Bond Formation. It is underlain by 4 to 5 feet (1.2 to 1.5 m) of clay and overlain by a foot (0.3 m) of light-gray shale. The only known occurrence of the Cohn coal in Indiana is at Merom, Sullivan County (W2 sec. 7, T. 7 N., R. 10 W.), where it is more than a foot (> 0.3 m) thick and has been mined on a small scale.