BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 13, PP. 233-252, PLS. 40-43 JULY 29, 1902 



GEOLOGICAL SECTION OF THE ROCKY MOUNTAINS IN 

 NORTHERN ALASKA* 



BY F. C. SCHRADER 



{Presented before the Society January #, 1902) 



CONTENTS 



Page 



Geography and topography 234 



In general 234 



Koyukuk province 234 



Mountain province 235 



Colville or Arctic Slope province 236 



Geological section 237 



Paleozoics 238 



Skajit formation (Upper Silurian) 238 



Character and occurrence 238 



Structure 239 



Age 239 



Totsen series (Silurian) 239 



Character and occurrence 239 



Structure 240 



Age 240 



Stuver series (pre-Devonian). 240 



Character and occurrence 240 



Structure 240 



Age 241 



Lisburne formation (Devonian) 241 



Character and occurrence 241 



Structure 241 



Age 241 



Fickett series (Lower Carboniferous) . .-. 242 



Character and occurrence 242 



Structure 242 



Age 243 



Correlation of Paleozoics 243 



>zoics r 244 



Corwin series (Jura-Cretaceous) 244 



Character and occurrence 244 



Structure 244 



Age 244 



* Published by permission of the Director of the U. S. Geological Survey. 

 XXXV— Bum.. Geoi.. Soc. Am., Voi,. 13, 1901 (233) 



