viii DEPARTMENT OF THE INTERIOR 



2 GEORGE V, A. 1912 



Page. 



Waterton formation 50 



Altyn formation 56 



General description 56 



Lower division 58 



[Middle division 59 



Upper division 60 



Comparison and conclusions 62 



Fossils 65 



Appekunny formation 66 



Grinnell formation 69 



Siyeh formation 71 



Sheppard formation 77 



General description 77 



Interbedded lava 79 



Kintla formation 81 



Absence of Triassic and Jurassic formations 83 



Cretaceous formations of the Great Plains at the Forty-ninth Parallel. 84 



Kishenehn formation 86 



Post-Miocene formations of the Great Plains 88 



Structure 89 



Folds and faults 89 



Great Lewis overthrust 90 



CHAPTEE V. 



Stratigraphy and structure of the MacDonald and Galton ranges. ... 97 



Galton series 97 



Altyn formation 98 



Hefty formation 99 



MacDonald formation 101 



Wigwam formation 103 



Siyeh formation 104 



Gateway formation 107 



Phillips formation 108 



Koosville formation. . . 109 



Devonian formation in the Galton range 110 



Description . . . 110 



Fossils Ill 



Paleozoic limestones of the MacDonald range 113 



Description 113 



Fossils 115 



Structure of the Galton-MacDonald mountain system 117 



