| Reference | {Deposit:: AUSTIN GEORGE S., 1972, INDIANA GEOLOGICAL SURVEY, PAGE 13.}{Deposit:: MESA HEALTH AND SAFETY INSPECTION REPORT FEBRUARY 2, 1972.}{Deposit:: FIFTY FEET OF SILTSTONE AND SHALE OF THE BORDEN GROUP ARE MI}{Deposit:: MSHA INSP. 1978}{Deposit:: RCF AND CMS LISTS 10/81} |