. The fluorspar deposits of southern Illinois . BULLETIN NO. 255 PL. II 8 E. frr Landing \ I I GEOLOGIC MAP OF THE PvOSICLARE DISTRICTILLINOIS BY BAIN. ASSISTED y^ Scale V-2 mile LEG EN D tL Lamprophyre / dike^ and sheets I Mansfield sandstone /sandstone and Cong torn erate / C>pre3s sandstone /sandstone, ^stom near middle f I oolitic limestone I limestone ( cherty limestone ) Veins Faults X Mines ^ Strike and dip JULIUS BlENa 00 LITH PAIN.] DEVONIAN AND CARBONIFEROUS ROCKS. 19 pebble
. The fluorspar deposits of southern Illinois . BULLETIN NO. 255 PL. II 8 E. frr Landing \ I I GEOLOGIC MAP OF THE PvOSICLARE DISTRICTILLINOIS BY BAIN. ASSISTED y^ Scale V-2 mile LEG EN D tL Lamprophyre / dike^ and sheets I Mansfield sandstone /sandstone and Cong torn erate / C>pre3s sandstone /sandstone, ^stom near middle f I oolitic limestone I limestone ( cherty limestone ) Veins Faults X Mines ^ Strike and dip JULIUS BlENa 00 LITH PAIN.] DEVONIAN AND CARBONIFEROUS ROCKS. 19 pebbles of black material, probably phosphate of lime. There is alsoa certain amount of a green, flaky material, probably bed is very thin and was observed at only one point. Thickness.—The total thickness of the formation is unknown, asits bottom is not exposed and there are no drill holes passing throughit. A careful estimate was made by Mr. Ulrich and the writer; atleast 50 feet are exposed, and probably 100 feet or more are pres-ent. It is difficult to mak
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