. Bulletin of the Geological Society of America. Geology. "Spars" Clay-veins less than 4 inches wide are called " ; Figures 9 and 11 convey some idea of their forms and connection with cky-veins, the former being a vertical section, the latter (about 3 miles from the vein represented in figure 9) showing in plan six spars proceeding from one side of a clay-vein. On the oppo- site side of that vein no such pro- cesses were found. These narrow veins often injure the coal, and are more troublesome to the miner than the wider and more regular veins, but owing to their gre
. Bulletin of the Geological Society of America. Geology. "Spars" Clay-veins less than 4 inches wide are called " ; Figures 9 and 11 convey some idea of their forms and connection with cky-veins, the former being a vertical section, the latter (about 3 miles from the vein represented in figure 9) showing in plan six spars proceeding from one side of a clay-vein. On the oppo- site side of that vein no such pro- cesses were found. These narrow veins often injure the coal, and are more troublesome to the miner than the wider and more regular veins, but owing to their greater obscurity and irregularity but little attention is paid them by the mine surveyor. The spars that connect directly with a clay-vein, as in figure 11, appear. Figure 11.—" Spars " in Coal. One-two hundred and fiftieth natural 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 Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
