254 



NEW YORK STATE MUSEUM 



Tentaculite fossils, 1579-58 1 . 

 Tentaculite limestones, 201 5 . 

 Terminal moraine, 176 6 , 203 6 . 

 Tertiary system, 1748-757; life of, 175 6 . 

 Text-books on geology, 236 3 -38 2 . 

 Time, see Geologic time. 

 Torn mountain, 184*. 

 Torrey, John, botanist, 241 8 . 

 Trachyte, 1252. 



Trap, 1399, 1412, 184*, 204*, 2056. 

 Travertine, 120 7 ; localities producing, 



2342. 

 Trenolite, 1215, 

 Trenton group, 147 5 -49 3 . 

 Trenton limestone, 147 5 , 148 8 -49 3 , 



2001-11. 

 Triassic formation, 195 1 . 

 Triassic system, 1711-722 ; life of, 1721. 

 Tuffs, 125 5 . 

 Tully limestone, 1636, 2029-31. 



Ulster county, spathic iron ore, 221 9 - 



22*. 

 Upper Devonian rocks, 160M52 2 . 

 Upper Helderberg limestone, 160 2 , 2021. 

 Upper Silurian system, 1381, 1507-583; 



life of, 1582. 

 Utica slate, 149*. 



Van Rensselaer, Stephen, patron oi 

 first survey, 241 2 . 



Vanuxem, Lardner, statements quoted, 

 110 4 ; geologic report, 236 6 ; geolo- 

 gist, 2418. 



Vegetable life, 1331. 



Vinci, Leonardo da, geologic observa- 

 tions, 114 1 . 



Volcanic rocks, 124*, 125 2 . 



Walcott, C. D. ; Bulletin of the U. S. 

 geological survey no. 8i, HO 3 ; geo- 

 logic studies, 142 5 . 



Warsaw, salt wells, 155 6 . 



Washington county, limestone, 142 8 ; 

 rocks, 143 3 ; quartzite, 143 7 ; roofing 

 slate, 143 9 -44i; Cambrian forma- 

 tions, 145 9 . 



Water, geologic changes produced by, 

 128*, 179 2 , 2395. 



Waterlime, 1562, 2015. 



Westchester county, Archaean gneiss, 

 140 7 ; calciferous limestoDe, 147 3 ; 

 rocks, 150*. 



Xenophanes, geologic observations, 

 1137. 



Zinc, localities producing, 233 2 . 

 Zircon, 1226. 



