6 CONTENTS. 
Petroleum at Controller Bay — Continued. . Page. 
Outlook for profitable exploitation — Continued. 
Difficulties of drilling 100 
Crooked holes 100 
Caving 100 
Water 100 
Remoteness from supplies 101 
Inexperience with local conditions 101 
Cost of labor and transportation 101 
Shipment and markets. 101 
Conclusions 102 
Reconnaissance in Matanuska and Talkeetna basins, with notes on 
placers of adjacent region, by Sidney Paige and Adolph Knopf 104 
Introduction 104 
Geography 104 
General geology 105 
Stratigraphy 105 
Structure 108 
Economic geology 109 
Coal 109 
Areal distribution 109 
Anthracite 110 
Bituminous Ill 
Eastern district Ill 
Western district 114 
Lignitic coals 115 
Gold 115 
Distribution of gold-bearing rocks 115 
Description of localities 116 
Willow Creek 116 
Nelchina River 118 
Knik River 118 
Yentna district 118 
Sunrise district 119 
Copper ' 124 
Knik River 124 
Kashwitna River 124 
Sunrise district 124 
The Nome region, by Fred H. Moffit 126 
Introduction 126 
General geology 128 
Kigluaik series 128 
Kuzitrin series 128 
Nome series 129 
Structure 130 
Veins 130 
Unconsolidated deposits 132 
General description 132 
Tundra gravels 134 
Glaciation * 137 
Economic geology 138 
Lode deposits 138 
Bismuth 138 
