INDEX 463 



PAGE 

 alethes, see Blountia. 

 alexas, see Blountia. 



Alga, relation of Cryptozoon 84 



Algse, no true, from China 58 



problematical fossils ? described, Lorenz 9 



structure of fossil 100 



and Bacteria, effects of Algonkian 96 



Algal depositions, table of, mentioned gi 



deposits, proved by Collenia 98 



of limestone 89 



flora, Algonkian and Cambrian 100 



Pre-Cambrian Algonkian, from Cordilleran area 79 



" Algoid Lake-balls," described by Barclay 88 



Algonkian algae, description of genera and species 104 



algal deposits, compared with recent Blue-green 100 



flora, classification 103-104 



forms, microscopic structure 102 



mode of growth loi 



mineral composition 102 



bacteria, suggested 103 



and algae, effects of 96 



Beaver Creek section 270 



Belt (Greyson shales) terrane, Montana 152 



Beltian series, locality 400c, Montana 105-107, 109, no, 116 



climate, suggested ^ 83 



Chuar terrane. Grand Canyon, locality 400b 114, 140 



formations 265 



Little Belt Mountains 273 



Grand Canyon section, fig. 1 1 283 



Greyson shales, Deep Creek Canyon, Montana 155 



lakes, compared with the " Great Lakes " 89 



limestones, origin of 84 



locality, Siyeh limestone, Montana 130 



400, Siyeh limestone. Glacier National Park,* Montana 108 



400a, Siyeh limestone, Montana 113 



400b, Beltian series, Spokane shales, Montana 114 



400J, Belt terrane, Montana 117 



unnumbered locality, Siyeh limestone, Montana 113 



period, in North America 81 



rocks, fauna of 97 



sedimentary rocks, absence of marine life in 290 



time, continental conditions during 80 



and Archean, unconformity between {Aa), pis. 41, 42 284-287 



and Cambrian, unconformity between {Ac), pis. 41-43 284-289 



unconformity illustrated, fig. 1 1 283 



sections, Helena 265 



* By error printed " Glacial " in text instead of Glacier National Park. 



