CONTENTS. \ 
Page. 
Recent development of Alaskan tin deposits— Continued. 
Placer tin deposits — Continued. 
York region 1 26 
Buck Creek 126 
York River 1 26 
Other localities 1 27 
Fairbanks district 1 27 
Cleary Creek occurrence 1 27 
Notes on the petroleum fields of Alaska, by George C. Martin 128 
Introduction 128 
Controller Bay petroleum field 128 
Location 128 
Geology ] 28 
Stratigraphy 1 28 
Structure 129 
Development of the field 131 
Previous drilling and its results L31 
Relation of the petroleum to structure 132 
Cook Inlet petroleum fields 133 
Cold Bay petroleum fields 1 34 
Geology 134 
Stratigraphy 134 
Structure 135 
Indications of petroleum 135 
Seepages 1 35 
Developments 136 
Character of the Oil Bay and Cold Bay petroleum 137 
Other possible petroleum fields 1 38 
Bering River coal field, by George C. Martin 1 40 
Introduction 1 40 
Geology 1 40 
Coal seams 1 43 
Character of the coal 1 46 
Development 149 
Coal resources of southwestern Alaska, by Ralph W. Stone 151 
Introduction 151 
Geology 1 52 
Development 1 52 
Description of localities 153 
Introduction 1 53 
Matanuska River 153 
Ty oiiok 1 54 
Kachemak Bay 155 
Coal beds west of Homer Spit 1 55 
Coal beds east of Homer Spit 157 
Port Graham 160 
Cape Douglas 1 61 
Amalik Harbor 161 
Katmai 162 
Cold Bay L62 
Ugashik Lake 162 
Kodiak Island 162 
Sitkiuak Island 163 
Aniakchak Bay 163 
