. Bulletin of the scientific laboratories of Denison University. 1/4 Bulletin of Laboratories of Dcnison University. [Voi xii again in the openings on Reynolds mountain, 8 miles northeast of Cave Spring. (See Fig. 15.) Manganife7'oiis Stained Chert.—Where the chert is mixed in large proportion with the ore-bearing clays, it is often more or less stained with the manganese. This may occur as thin films or layers of the manganese oxide coating the loose chert- fragments, or as stringers and veinlets filling the cracks in the chert. The proportion of staining to chert is quite variable. In many c
. Bulletin of the scientific laboratories of Denison University. 1/4 Bulletin of Laboratories of Dcnison University. [Voi xii again in the openings on Reynolds mountain, 8 miles northeast of Cave Spring. (See Fig. 15.) Manganife7'oiis Stained Chert.—Where the chert is mixed in large proportion with the ore-bearing clays, it is often more or less stained with the manganese. This may occur as thin films or layers of the manganese oxide coating the loose chert- fragments, or as stringers and veinlets filling the cracks in the chert. The proportion of staining to chert is quite variable. In many cases it amounts to only a mere film ; in others, the veins filling the cracks are quite thick. This has resulted from the free percolation of manganese-bearing waters through the loose cherty clays. Sometimes, that part of the chert not im- pregnated has been entirely or partially removed by decay, leaving a mass of siliceous manganese-ore of various shapes. Occurrence of the Ores.—The occurrence of the manganese in this area is closely similar to that in the Cartersville district, already described. (See Figs. 6. 7 and 15.) The ores differ Fig. II. Section through the Chumler Hill Mine, Georgia, Showing the Mode of Occurrence of the Manganese-Bearing Clay. (After Penrose.) A, sandstone ; B, manganese-bearing clay. Horizontal scale, \\n. ^= ]4r mile. Vertical scale, i in, =: 400 ft. principally in occurrence from those in the Cartersville district in {a) their intimate association >vith the cherty beds and clays of the upper part of the Knox dolomite, in {Ji) being limited to the residual clays derived from only one formation, and ic) be- ing stratigraphically above those of the Cartersville district, oc- curring in the clays of the Knox dolomite and not found at all in the clays of the Weisner quartzite and Beaver limestone,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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