Annual report of the United States Geological Survey to the Secretary of the Interior . A. QUARTZITE, NO. 183 CALAVERAS, SHOWING THE INTERLOCKING QUARTZ GRAINS. B. QUARTZ BAND IN GRANULITE, NO. 998 S. N., SHOWING THE INTERLOCKING QUARTZ GRAINS. PLATE XXXIX. PLATE XXXIX. A. Granulite, No. 998, allowing the granulitic structure in the Tipper part of the sec- 1 ion, and micropegiiiatite in the lower part. With the analyzer, X 20. B. Pre-Cretaceous tnff, No. 524 S. N., showing bent an<l fractured feldspar such as are found in cataclastic feldspathic rocks. This gives evidence of the rockhaving
Annual report of the United States Geological Survey to the Secretary of the Interior . A. QUARTZITE, NO. 183 CALAVERAS, SHOWING THE INTERLOCKING QUARTZ GRAINS. B. QUARTZ BAND IN GRANULITE, NO. 998 S. N., SHOWING THE INTERLOCKING QUARTZ GRAINS. PLATE XXXIX. PLATE XXXIX. A. Granulite, No. 998, allowing the granulitic structure in the Tipper part of the sec- 1 ion, and micropegiiiatite in the lower part. With the analyzer, X 20. B. Pre-Cretaceous tnff, No. 524 S. N., showing bent an<l fractured feldspar such as are found in cataclastic feldspathic rocks. This gives evidence of the rockhaving undergone crushing. With the analyzer, X U. S. GEOLOGICAL SURVEY SEVENTEENTH ANNUAL REPORT PART I PL. XxXIX. A. GRANULITE, NO. 998, SHOWING GRANULITIC STRUCTURE AND MICROPEGMATITE. B. BENT AND FRACTURED FELDSPAR IN PRE-CRETACEOUS TUFF. PLATE XL. PLATE XL. A. Pegmatoid intergrowth of tourmaline and quartz, No. 928 S. N. Without the analyzer, x 20. This rock formed part of a pegmatite dike inquartz-pyroxene-diorite southeast of Souora. B. Granite, No. 39 S. N., showing the large idiomorphic titanites with prongs on the sides of the largest prism. Without the analyzer, X hornblende; M = black mica; F=iron oxide; D = U. S. GEOLOGICAL SURVEY SEVENTEENTH ANNUAL REPORT PART I PL. XL
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