General Index. 69 1 



Tertiary Formations, the most recent in Maes. . . 173 



position & thickness of its strata, 175 

 remarkable disturbances in, 174 

 minerals in, . 178 



organic remains in, 182 



theory of, . 183 



Theory of Central Heat, &16 



of causes now in action, 518 



of the Elevation of Mountains, . . 538 



Tin, oxide of, 64, 509 



Titan's Pier ... 81, 431, 408 



Titanium, red oxide of, 349, 363, 381, 398, 462 



ferruginous oxide of, . . 349 



silico-calcareous oxide of, . 310,331,398 



Toby, Mount, .... 



Tom, Mount, .... 



Topaz, . 503 



Tormaline, green and red, ... 505 



Topographical Geology defined, 



Trap Conglomerate, . 211, 417 



Trap System of Strata, . 530 



Tree, fossil in new red sandstone, . . 234 



Tremolite, . , 3( > 4 , , 312 



Tremont House, its granite, 



Tripoli in West Springfield, . .48, 231 



Turbo fossil at Gay Head, .196 



Turner's Falls, 



Tynsborough Granite, . . 16 



U. 



United States Bank, Boston, its granite, . . 16 



Unstratified Rocks defined, . . .402 



their origin, . . . 403 



how represented on the Geological Map, 404 



Useful Rocks and Minerals in the State, . . 13 



V. 



Valley of the Connecticut, . . .88, 132 



how far a valley of excavation, 221 



of Worcester, . . . .91 



of the Merrimack, . 92 



Vallies of Berkshire, . . . 87, 141 



how formed, .... 131 



terraced, how formed, * . . 134 



of denudation, . 140 



Varioloid Wacke, .... 259 



Vegetable remains in Plastic Clay, . 192 



Vegetation early on the Globe, . . . 245 



Veins in new red sandstone, . 425 



in graywacke. . . . 254 



in quartz rock, .... 324 



in mica slate, . . . 341 



in sienite, .... 456 



in granite, .... 473 



metallic, their origin, &c. . . 520 



their direction and dip, . 521 



Venus fossil in plastic clay, . . . .196 



Verdantique, . . .80 



Vermiculite, ... . . .399 



