CONTENTS. 5 



Geology — Continued. Page. 

 Sedimentary rock formations — Continued. 

 Mesozoic rocks — Continued. 



Corwin series (Jura-Cretaceous) — Continued. 



Age 74 



Correlation 74 



Anaktuvuk series (Lower Cretaceous) 74 



Character and occurrence 74 



Structure 75 



Age - 76 



Correlation 76 



Koyukuk series (Lower Cretaceous) 77 



Character and occurrence 77 



Structure 77 



Age 77 



Correlation 77 



Bergman series (Cretaceous?) 77 



Character and occurrence 77 



Structure 78 



Age 78 



Nanushuk series ( Upper Cretaceous) 79 



Character and occurrence 79 



Structure 80 



Age 80 



Correlation 80 



Tertiary rocks 81 



Colville series (Oligocene and Pliocene) _ 81 



Character and occurrence ■_ 81 



Structure , 82 



Lower Colville (Oligocene) 82 



Upper Colville (Pliocene) 83 



Pleistocene deposits 84 



Glacial deposits and glaciation 84 



Ground-ice formation and Kowak clay 91 



Gubik sand 93 



Recent mud, muck, ground ice, dune sand, silts, and gravels 94 



Inland region 94 



Coastal region 95 



Prom Colville River to Point Barrow 95 



From Point Barrow to Cape Lisburne 96 



Recent fossils from the Arctic coast 96 



Table of provisional correlations 97 



Mineral resources 98 



General statement 98 



Gold 98 



Copper 104 



