. Bulletin of the scientific laboratories of Denison University. 172 Bulletin of Laboratories of Denison University. [Voi. xii tions indicated in the general character and thickness of the rocks. These formations have been described in sufficient de- tail under the Cartersville district, and will not be repeated here. The Knox dolomite of the Cave Spring district needs further description, since it is the only formation in the ai'ea with which the manganese-ores are associated. The Knox dolomite is vastly the most extensive formation in the district. The percentage of chert is much larger, and
. Bulletin of the scientific laboratories of Denison University. 172 Bulletin of Laboratories of Denison University. [Voi. xii tions indicated in the general character and thickness of the rocks. These formations have been described in sufficient de- tail under the Cartersville district, and will not be repeated here. The Knox dolomite of the Cave Spring district needs further description, since it is the only formation in the ai'ea with which the manganese-ores are associated. The Knox dolomite is vastly the most extensive formation in the district. The percentage of chert is much larger, and the cherty masses and fragments are larger in size than else- where for this formation. In places, the limestone appears to be largely replaced by layers of the massive chert. Its surface is very generally strewn with the chert, and the deep-red clays derived from the limestone are heavily charged with the chert- fragments in all stages of decay. Fig. Watsoo. Section in Knox Dolomite, 2 miles East of Kingston, Georgia, Illustrating Weathering of the Magnesian Limestone. (Modified from Spencer.) A, residual clay ; B, fresh magnesian limestone. Sti^ctiire.—Referring again to the map (Fig. 9), it is ob- served that nearly the entire southeast part is occupied by the massive Knox dolomite, which resisted the sharp folding mani- fested in some of the other formations. The remaining part of the map indicates numerous faults cutting the strata. These are mostly of the minor-thrust type, intersecting the Knox dolomite and the Conasauga shale, and they expose at the sur-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison University; Denison Scientific Association. Granville, Ohio : [The University]
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