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. SCHEADER 



(Presented before the Society January S, 1902) 

 CONTENTS 



Page 

 Geography and topography 234 



In general - • 234 



Koyukuk province 234 



Mountain province 235 



Oolville 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 



Mesozoics 2^4 



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., Vol. 13, 1901 (233) 



