INTRODUCTION TO THE MT. RORAH COAL BED AND MT. RORAH COAL BALLS AT THE CREEK PAUM MINE IN SOUTHWESTERN ILLINOIS, GEOLOGIC CONTEXT AND PALEOBOTANICAL UNIQUENESS
ELRICK, Scott, Illinois State Geological Survey, Prairie Research Institution, 615 E Peabody Dr, Champaign, IL 61820, DIMICHELE, William, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, FALCON-LANG, Howard, Royal Holloway University of London, London, United Kingdom and NELSON, W. John, Illinois State Geological Survey, 615 E Peabody Dr, Champaign, IL 61820