CONTENTS 
rage. 
fetter of transmittal 7 
gtroduction 9 
Geographic relations 9 
Economic development 9 
Fortymile region 10 
Birch Creek region 11 
Rampart region 11 
Faii-hanks region 11 
Climate and vegetation 12 
Work of the survey 13 
Previous work _- 13 
Work of 1903 13 
Topographic party 14 
Geologic party 14 
Conditions of travel 16 
Geographic description 17 
Topography 17 
Drainage 18 
Fortymile region 18 
General character 18 
Fortymile system 18 
Mission system 19 
Seventymile system 20 
Birch Creek region 21 
General character., 21 
Birch Creek system l 21 
Fairbanks region 22 
General character 22 
Chatanika and Chena rivers 22 
©logic sketch- 23 
Introduction : — 23 
Stratigraphic succession 24 
Geologic map r — 25 
Sedimentary and metamorphic formations 26 
Pelly gneiss 27 
Birch Creek schists __ 28 
Fortymile formation 29 
i Rampart formation 31 
Kenai formation 32 
Quaternary deposits 34 
Bench gravels 34 
Stream gravels 35 
