| Reference | {Deposit:: LEVINE, S, 1967, MEDUSA MOVES TO MICHIGAN RESORT AREA, ROCKS PRODUCTS, P 53- 61.}{Deposit:: MILSTEIN, R.L., MIDDLE DEVONIAN TRAVESERSE GROUP IN CHARLEVOIX AND EMMET COUNTIES, MICHIGAN, SUBSURFACE AND PETROLEUM GEOLOGY UNIT, MICHIGAN GEOLOGICAL SURVEY.} |