General Index. 



691 



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



position & thickness of its strata, 175 

 remarkable disturbances in, 174 

 minerals in, . 173 



organic remains in, 132 

 theory of, . 133 



Theory of Central Heat, . . . &iq 



of causes now in action, . . . 513 



of the Elevation of Mountains, . . 533 



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, . 310,381, 398 



Toby, Mount, 83 

 Tom, Mount, • • . . 81 



Topaz, ..... 503 



Tormaline, green and red, . . . 505 



Topographical Geology defined, . . .73 



Trap Conglomerate, . • . 211, 417 



Trap System of Strata, . . . . 530 



Tree, fossil in new red sandstone, . . 234 



Tremolite, . . 304, 310, 312 



Tremont House, its granite, • • . 17 



Tripoli in West Springfield, . .48, 231 



Turbo fossil at Gay Head, . . . .196 



Turner's Falls, ... 99 



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, . . . I40 



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, . . . . 455 



in granite, .... 473 



metallic, their origin, &c. . . . 520 



their direction and dip, . . 521 



Venus fossil in plastic clay, . . . .196 



Verdantique, . . . .30 



Vermiculite, ..... 399 



