INDEX 



An asterisk (*) after a page number indicates that a figure of the object named will be found 

 on that page, while a dagger (f) implies that a definition or explanation is contained in the 

 page designated, though this symbol is not employed unless there is more than one reference 

 under a given head. Family and generic names of animals and plants are printed in Italics. 



Acadian coal field, 414. 



Acadian epoch, 355, 368. 



Acadian province, 395f, 428. 



Acadian range, 333. 



Acanthodes, 426. 



Accessory minerals, 193. 



Accidents to rivers, 330. 



Acervularia, 400, 401*. 



Acid lavas, 42; rocks, 191, 195, 196. 



Acidaspis, 400. 



Acquia Creek stage, 475. 



Actiiiocrinus, 400, 424. 



Actinolite, 20. 



Actinopterygii, Carboniferous, 406 ; De- 

 vonian, 426. 



Adjustment of rivers, 321, 326-j-. 



Adjutants, fossil, 516. 



Adriatic Sea, 514. 



JEgean Sea, 514, 515. 



ASgoceras, 467. 



^Eolian rock, I27f, 205f, 217. 



SEsiocrimis, 423*, 424. 



yEtna, 98 ; dikes in, 50 ; origin of, 520. 



Aetosaurus, 454. 



Africa, Archaean of, 360 ; Carboniferous 

 of, 418 ; Cretaceous of, 484 ; Devonian 

 of, 399 ; Eocene of, 500 ; Jurassic of, 

 461 ; Miocene of, 514 : Ordovician of, 

 377 ; Permian of, 437 ; Silurian of, 388 ; 

 Triassic of, 448. 



Aftonian stage, 529, 53of. 



Agassiz, A., 173. 



Agate, 16. 



Agathaumas, 492*. 



55 



Age, geological, 354. 



Agelacrinus, 383*. 



Agglomerate, volcanic, 5if, 203f, 277. 



Agnostus, 372, 373*. 



Alabaster, 23. 



Alaria, 466. 



Alaska, Eocene flora of, 502 ; glaciation 

 of, 527 ; glaciers of, 108 ; Jurassic of, 

 461 ; Miocene of, 512 ; Pliocene of, 518. 



Albertan drift sheet, 529. 



Albirupean stage, 475. 



Albite, i6f, 17. 



Aleutian Islands, work of frost in, 83. 



Algae, calcareous, 450; deposits by, 130. 



Algonkian period, 355, 36if. 



Alkali streams, 102. 



Alkaline carbonates, 128, 130, 267 ; sul- 

 phides, 130, 267. 



Allodon, 493. 



Alloris7na, 423*, 425. 



Allotriomorphic crystals, 190. 



Alluvial cone, 137-}-, 138* 231; fan, 137. 



Aloes, fossil, 502. 



Alpine glaciers, no. 



A1 P S > 3 2 S. 333. 334. 496 ; glaciers of, 107 : 

 Pleistocene glaciers of, 536 ; upheaval 

 of, 514, 515. 



Altai Mountains, 399. 



Alteration of rocks, 287. 



Amazon River, 102. 



Amblypoda,505. 



Ambonychia, 383*. 



Amethyst, 15. 



Ammonites, Eocene, 503. 



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