SOME HIGHLIGHTS OFTHE CARBONDALE GROUP (PENNSYLVANIAN) IN THE

The Pennsylvanian System in Indiana is composed in ascend- ing order of the Raccoon Creek, Carbondale, and McLeansboro Groups. The Carbondale contains the rocks between the base of the Colchester Coal and the top of the Danville Coal Members and is composed, in ascending order, of the Linton, Petersburg, and Dugger Formations. These formations contain laterally persistent limestone and coal Members that can be traced in the subsurface throughout much of the Illinois Basin. Flooding surfaces are rec- ognized above the Colchester, Houchin Creek, Springfield, and Herrin Coals. The Carbondale ranges in thickness from 270 to 430 feet.