INDEX 



Abbott, C. C., 930 

 Acadian series, 476, 482 

 Aceratherium, 823 

 Acidic rocks, 24 

 Acondylacanthus gracilis, 608 

 Acrocrinus amorpha, 613 

 Acrotreta gemma, 497 

 Actaeon shilohensis, 826 

 Actinocrinus lobatus, 609 



senectus, 608 

 Actinolite, 52, 74 

 Actinopteria textiles, 576 

 Adams, C. C., 937 

 Adams, F. D., 440 

 Adams, G. I., 798 

 Adjustment of streams, 160 

 Adobe, 81 



Africa, Carboniferous in, 643 

 Africa, Cretaceous in, 758 



Devonian in, 574 



Lower Cretaceous in, 736 



Miocene in, 817 



Permian in, 667 



Pleistocene life of, 922 



Tertiary in, 783, 817 



Triassic in, 690 

 Aftonian interglacial interval, 874, 



875 



Agassiz, A., 289, 315 

 Agassiz, L., 287 



Agassizocrinus dactyliformis, 613 

 Agates, 44, 74, 80 

 Agglomerate, 81 



volcanic, 21 



Aggradation, 2, 177, 296 

 Agnostus interstrictus, 496 

 Aitkin, J., 231 

 Ajibik quartzite, 460 

 Alabaster, 75 

 Alaska, Carboniferous of, 629 



Comanchean of, 734 



Cretaceous of, 752 



Devonian of, 569 



Eocene of, 776 



Glaciation of, 849 



Alaska continued 



Jurassic of, 707 



Miocene of, 813 



Pliocene of, 845 



Silurian of, 544 

 Albertan "drift," 875 

 Albian series, 757 

 Albite, 75 

 Aldrich, T. H., 797 

 Alethopteris, 644 

 Aletsch Glacier, 240 

 Algae, agents of deposition from solu- 

 tion, 205 



Algonkian, see Proterozoic 

 Allegheny series, 626 

 Allen, J. A., 750 

 Allorisma subcuniata, 658 

 Alluvial cone, 179 



fan, 180 



plains, 183 

 Alluvium, 81 

 Alpine glaciers, 232 

 Alps, 358 



Alps, development of, 817 

 Amber, 800 

 Amberleya dilleri, 741 

 Ameghino, F., 783 

 Amethyst, 75, 80 

 Ammonites, Cretaceous, 770, 771 



Jurassic, 711, 712 



Triassic, 696, 698, 699 

 Amphibians, Eocene, 794 



Mississippian, 619 



Pennsylvanian, 652 



Permian, 672 



Triassic, 692 

 Amphiboles, 26, 75 

 Amygdaloid, 81 

 Anatina austinensis, 740 

 Anchippus, 802, 821 

 Anchisaurus colurus, 693 

 Andalusite, 75 

 Anderson, F. N., 808 

 Andesine, 75 

 Andesite, 81 



947 



