. Bulletin of the scientific laboratories of Denison University. 1/8 Bulletin of Laboratones of Denison University [Voi. xii stringers and masses only a few inches in thickness, which cut the clay in all directions, conforming at times with the bedding- planes. Many of the stringers are composed of quartz, around and along which the ore is deposited as impregnations, incrus- tations, and as nodules and gravel. A goodly proportion of the gravel and nodular types of the ore is distributed through the clays without any apparent relation to the chert-fragments and masses. In most cases, however, t
. Bulletin of the scientific laboratories of Denison University. 1/8 Bulletin of Laboratones of Denison University [Voi. xii stringers and masses only a few inches in thickness, which cut the clay in all directions, conforming at times with the bedding- planes. Many of the stringers are composed of quartz, around and along which the ore is deposited as impregnations, incrus- tations, and as nodules and gravel. A goodly proportion of the gravel and nodular types of the ore is distributed through the clays without any apparent relation to the chert-fragments and masses. In most cases, however, the ore is closely asso- ciated with the chert, varying from impregnations as seams of knife-edge thickness to a ground-mass of ore cementing the par- tially fresh and decomposed chert-fragments. (See Fig. 15.) The form of breccia-ore commonly occurring in this locality is shown in Fig. 15. The proportion of chert to ore of the breccia-mass varies widely, from a mere film of manganese ox- ide, filling the cracks of the shattered chert and binding them together, to those in which the largest bulk of the mass is ore containing but few small chert-fragments. Fig. 14. Section in One of the Openings at the Lindale Mine, 4 Miles South of Rome, Georgia, Showing the Mode of Occurrence of the Manganese-Ores. A, ore-bearing clay. The black areas are manganese. The irregular areas with straight parallel lines are fragments of chert and sandstone, the cracks of which are filled with manganese oxide. IJie Tunnel Hill District.—The Tunnel Hill district in- cludes the contiguous parts of Whitfield and Catoosa counties in the northeast part of the Paleozoic Group. In structure and topography the area quite closely resembles certain parts of the Cave Spring district already described. The rocks include shales, sandstones and limestones, and in age they range from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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