New York State Museum bulletin . acks, quartzites are not so prominentlydeveloped in the Grenville of the Blue Mountain quadrangle. Alsothey vary greatly in composition, scarcely any two localities showing i6 NEW YORK STATE MUSEUM a^ilEtnaH a^t^dBJo _o 3:^iAOosnj^ ^ - - s^ra^^iX jj _a a^TSTO^ ii UOOJT2 5 ill 2 \\ aai;BdY ^^ j aiuS^ HC| npi^o - ?^ c a^i^saSBj^ 1 1 ji :^^ulB£) - i actixornajx lA s^i^otg o apusxqtuoH o 9a3X0Jz^donnxoouoj^ - c_o C ?) c z%J^mQ ?sj:5;??i i/^ C C ^O o- Tf ri PT4- -* asBx^oi^^d o < rO -• <*5 . . « 5< == ^UTX^OJ^lp^i rojoO i i Ci a^iqvsdojoij^ ;i?sg vO OOO s 3
New York State Museum bulletin . acks, quartzites are not so prominentlydeveloped in the Grenville of the Blue Mountain quadrangle. Alsothey vary greatly in composition, scarcely any two localities showing i6 NEW YORK STATE MUSEUM a^ilEtnaH a^t^dBJo _o 3:^iAOosnj^ ^ - - s^ra^^iX jj _a a^TSTO^ ii UOOJT2 5 ill 2 \\ aai;BdY ^^ j aiuS^ HC| npi^o - ?^ c a^i^saSBj^ 1 1 ji :^^ulB£) - i actixornajx lA s^i^otg o apusxqtuoH o 9a3X0Jz^donnxoouoj^ - c_o C ?) c z%J^mQ ?sj:5;??i i/^ C C ^O o- Tf ri PT4- -* asBx^oi^^d o < rO -• <*5 . . « 5< == ^UTX^OJ^lp^i rojoO i i Ci a^iqvsdojoij^ ;i?sg vO OOO s 3srspox{iJO :2 :^ ?ou ppij •ou gpyis - t- O c 5 CJ ^ ?<; jj; -l- S ^ «J rt S ^ 5 -J i - £ C 51 J3:^- ^ rt • -/!H u- w o - ^ ?— ^ drT ^ L ^ - ^ ^ i ^- . .2 ^^^ c <u « So ^ - o 5i -^ 2 r- OS ^ a :: 5 tc cS - -* j5 «^ ifl V- u D c/: ^ «« C 3 « t:^ sj^S cJ3— c ° fc£ 5 c r;^ ^ t« -w J5 p o =-2 o •5 ^ o ^ ^ ^ ^f« ° to O O lOO ti -^ ^ -i-^ . T 5 o ^ ^ 2 -= O ^£ O g -^ 1; Q = O ^;= « £ 5 S o o. GEOLOGY OF THE BLUE MOUNTAIN QUADRANGLE IJ the same kind of rock. Most of the quartzites are fine to mediumgrained and thin bedded. In general there are two importantvarieties — one with feldspar and the other without. The feldspathic quartzites carry from lo to 25 per cent of feld-spar together with 5 to 15 per cent of either biotite, muscovite orgreen pyroxene, or slight amounts of tiny red garnets or graphiteflakes. The nonfeldspathic varieties contain 90 or more per cent ofquartz together with either biotite or muscovite. Among the better quartzite exposures are the following: onseveral islands in the northern part of Blue Mountain lake; in theridge just north of Pine lake; and along the road at the countyline 9 miles east of Long Lake village. Feldspar-quartz-hiotite-garnet gneisses. These gneisses are notvery abundant and vary greatly. Perhaps the most common varietyis a fine to medium-grained, crudely banded, light-gray rock madeup mostly of feldspar an
Size: 1239px × 2017px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorne, bookcentury1900, bookdecade1910, booksubjectscience
