168 



NEW YORK STATE MUSEUM 



Pyroxene, 92 9 , 93 1 , 93 4 , 93 7 , 97 8 , 98 2 , 

 98 5 , 98 7 , 113 3 , 115 8 , 145 2 , 154 6 , 155\ 

 155 9 . 



Pyroxene gneiss, 98 1 -99 4 . 



Pyrrhotite, 100 5 , 114 2 , 155 5 . 



Pyrrhotite gneiss, 155 8 . 



Quartz, 93 4 , 93 7 , 96 s , 97 1 , 97 4 , 98 2 , 

 100 5 , 103 8 , 106 2 , 106 9 , 107 1 , 107 s , 

 108 3 , 108 9 , 114 2 , 115 4 , 116 9 , 142 9 , 

 144 3 , 144 5 , 145 2 , 145 3 , 147 s , 148 4 , 

 149 2 , 150 6 , 154 6 , 154 s , 155 9 , 159 2 , 159 5 . 



Quartzites, 150 7 , 155 4 , 155 s , 159 6 , 160 7 . 



Quartzose augite syenite, 109 1 . 



Quartzose gneiss, 93 6 , 127 7 , 159 6 . 



Quicklime, 71 2 . 



Racquette river, 84 8 , 86 4 , 87 9 -88 3 . 



Ramapo mountain, 19 9 . 



Red sandstone rocks of Rockland 



county, 5 7 , 9-50; thickness, 21 6 ; 



conditions of formation, 49 3 -50 9 . 

 Rivers in Adirondacks, 84 3 -89 4 . 

 Road metal of Franklin county, 



127 1 . 

 Rockland county, Newark rocks, 5 7 , 



9-50; geologic map in front cover. 

 Rockland Lake, trap rock, 28 7 -29 3 . 

 Ruedemann, Rudolf, cited, 146 s . 



St Lawrence county, crystalline 



rocks, 131 5 , 133\ 

 St Regis river, 84 s , 86 4 , 88 5 ; illus. 



facing p. 118. 

 Salmon river, 88 7 -89 4 . 

 Sandstones, 13 2 ; exposures, 16 4 -18 8 , 



20 4 , 53 7 , 60 2 ; effect of contact with 



trap, 35 x -36 4 ; feldspathic, 154 7 . 



See also Potsdam sandstone. 

 Saranac river, 84 7 , 85 4 , 86 4 -87 9 . 

 Sarle, O. J., investigations, 6 8 . 

 Scapolite, 93 4 , 93 7 , 160 7 . 

 Schaeffer, C. O., cited, 69 2 , 71 3 . 

 Schist, 134 5 , 144 4 ; hornblende, 160 3 , 



160 7 . 

 Schistose gneiss, 160 7 . 



Schoharie grit, exposures, 55 9 . 



Schoharie sections, 63 8 -67 2 . 



Serpentine, 93 1 , 160 6 . 



Shales, 13 2 ; exposures, 16 4 , 18 2 , 34 4 , 

 53 7 , 60 2 , 60 9 , 65 1 , 67 7 , 71 8 , 72 1 ; ef- 

 fect of contact with trap, 35 x -36\ 



Short Clove, trap rock, 3P-32 1 ; illus. 

 facing p. 10. 



Silicates, 142 9 , 150 5 , 154 7 , 161 1 . See 

 also Augite; Hornblende; Pyrox- 

 ene. 



Sillimanite, 93 9 . 



Siluric age, eruptive rocks, 123 1 . 



Simpson, G. B., work on generic 

 characters of fossil corals, 6 s . 



Smyth, C. H., jr, Report on progress 

 made during 1898, in mapping the 

 crystalline rocks of the western 

 Adirondack region, 5 4 , 129-35; 

 cited, 90 3 , 105 3 , 109 3 . 



Sparkill, trap rock, 32 2 . 



Stockton beds, 13 7 , 14 4 , 15*. 



Streams in Adirondacks, 84 8 -89 4 . 



Suffern, sandstone and conglomer- 

 ate beds, 20 4 ; trap, 42 2 . 



Syenites, relation to anorthosite, 

 109 3 ; represented on Geologic 

 map, 132 9 , 135 5 ; of Franklin coun- 

 ty, 99 8 , lOl 9 , 102 1 , 105 3 -9 5 , HO 9 , 114 8 , 

 116 7 , 116 s , 126 9 , 127°; of Hamilton 

 county, 142 3 ; of Warren county, 

 159 7 ; of Washington county, 162 5 . 



Syenitic gneisses, 94 4 , 135 5 , 144 s ; 

 illus. facing p. 108. 



Syenitic porphyries, 117 s , 118 8 , 118 s . 



Tentaculite limestone, exposures, 

 53 4 , 54 3 , 57 4 , 63 4 , 64 4 , 66 4 , 69 5 , 70 6 ; 

 illus. facing p. 54, 68; quarries, 

 66 7 , 67 3 , 71 2 ; analysis, 71 3 . 



Titanite, 92 9 , 100 5 , 103 8 , 107 3 , 114 3 , 

 125 6 , 155 5 . 



Trap dikes, 143 9 , 144 7 . 



Trap rocks, 22 x -42 c ; contact with 

 sandstone, 32 8 ; upper contact of 

 trap and shale, 32 x -34 8 ; effect on 



