UNDERGROUND COAL INE Herrin (No. 6 Illinois: IDEALS Home
minor channels in central and southern Illinois. The major channel, which passes southeast of Crown II, has been traced for over 160 km (100 miles) and is up to km (2 miles) wide. In this channel, the Herrin (No. 6) Coal and lower members have been eroded, and the Anvil Rock Sandstone may exceed 30 meters (100 feet) thick