. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 4.—Part of a thin section of quartz-schist. Showing liquid and gas filled cavities of a secondary nature. the disintegration of the quartz particles has gone farther. An individual, instead of extinguishing upon the whole as a unit, is now composed of individuals which extinguish more or less independently (fig. 5 ; figs. 1 and 2, plate 4), although the positions of extinction are not far from each other,. Figure 5.— Thin section ofquartz-schir. Showing the manner in which a large fragment of quartz is b
. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 4.—Part of a thin section of quartz-schist. Showing liquid and gas filled cavities of a secondary nature. the disintegration of the quartz particles has gone farther. An individual, instead of extinguishing upon the whole as a unit, is now composed of individuals which extinguish more or less independently (fig. 5 ; figs. 1 and 2, plate 4), although the positions of extinction are not far from each other,. Figure 5.— Thin section ofquartz-schir. Showing the manner in which a large fragment of quartz is broken down by dynamic action. except the grain has been wholly destroyed. When the disintegration of the quartz has proceeded thus far, it often happens that two adjacent frag- ments have merged together in part, so that it is impossible to determine exactly the line of separation between the two. It is not ordinarily the case that all of the grains of quartz are wholly destroyed, nor does it often happen that all of them are practically intact. Every grade of variation from one extreme to the other is sometimes found within a single section, and the more. 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, etc. ] The Society
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