450 



NEW YORK STATE MUSEUM 



Camptonites, 396^. 

 Cassin formation, 362^-64'. 

 Cenozoic history, 290'-92^. 

 Cbalcopyrite, 304*'. 

 Chamberlin, cited, 441*. 

 Champlain dikes, age of, 396''-97°. 

 Champlain valley, 438^ 

 Chazy formation, 282^-83*, 365\ 389'- 



90^ 

 Cbeirurus polydorus, 366". 

 Chemical analyses, 331^-38% 350'-51^ 



397^ 398<'-99^ 

 Chlorite, 304^ 348^ 351», 352^. 

 Cumings, cited, 377^ 383^ 

 Cushing, H. P., cited, 374^ 



Dannemora formation, 303\ 



Darton, cited, 397^ 410". 



Diabase, 278^ 348^-54=, 355^ 356=; 

 analyses, 351S 353^ 



Diabase dikes, 345^ 346", 348^-54=; 

 faulting, 4031 



Diana syenite belt, 315*. 



Dikes, 278^ 345«; black, 279-; dia- 

 base, 345^ 346", 348^-54=, 403^; red, 

 279'; syenite, 346'. See also 

 Basic dikes ; Champlain dikes. 



Drainage, 437"-45' ; present, youthful 

 character of, 442M5'. 

 • 



Eakle, cited, 3511 



Elevation, main axis of, 427^-29-. 



Emmons, cited, 369^ 372^ 380^ 



English river, 440^ 



Enstatite, 300^ 



Epidote, 304^ 348', 351^ 



Erosion, paleozoic, 288*-89\ 



Erosion interval, surface topography 

 at close of, 277*. 



Faults, 403^-12^ ; crossing Appalach- 

 ian uplift, 422' ; production of, 

 286" ; as topographic features, 

 430-'-33^ 



Feldspar, -295^ 297S 299», 300', 301', 

 304*, 304^ 309^, 309^ ^09^ 313\ 

 313% 313\ 319*, 319% 320", 321*, 

 326^ 328^ 328«, 329^ 334*, 336*, 

 337% 3^7^ 338', 339^ 348% 348", 



349% 349*, 349% 351^ 352^ 352% 

 352*, 352% 354% 354^ 355% 356% 

 356% 395% 396-; white, 311% 



Folds, 402"-3% 



Foliation, 399^-402^. 



Fourchites, 396% 



Gabbros, 275^ 306% 327^-31% 335% 



338% 340" ; analyses, 332% 353% 

 Garnet, 295% 296% 304% 306*, 309% 



309% 311% 313^, 313", 314% 319*, 



328% 334% 335^ 337% 337% 337^ 



354^ 

 Geologic history, summary of, 272^- 



94% 

 Glacial history, 292^-931 

 Gneisses, 273% 294^ 295% 338% 343', 



356=; analyses, 333=; doubtful, 



299"-303^ 

 Granites, 275% 322^-27^ 338% 338^ 



foliation, 401% 

 Graphite, 295*, 295^ 296^ 

 Grasse river, 439% 

 Grenville rocks, 295*-99% 435% 



Harpes sp., 366% 



antiquatus, 366% 

 ottawaensis, 366% 



Helderberg submergence, 386% 



Hematite, 348", 348% 352", 352^ 356% 

 395% 



Hornblende, 296% 300% 300^ 301', 

 304", 309% 30^, 309% 310', 311*, 

 313% 314', 314% 315^ 319*, 323", 

 326% 328% 329=, 330% 334%' 335% 

 336*, 337% 337^, 348", 352^, 396% 

 396% 



Hoskins, L. M., cited, 401% 



Hudson river, 439^, 441". 



Hyperite, 330' ; analyses, 332% 353*. 



Hypersthene, 300% -304% 305% 309% 

 309% 312% 313% 313", 313', 319*, 

 328% 329% 



Igneous activity, 287'-88=. 



Igneous intrusions, 275*. 



Igneous rocks, 274'; foliation, 400''; 

 paleozoic, 394*-99* ; late Precam- 

 bric, 345°-54= ; of the upper Mo- 

 hawk region, 397^-98'. 



