CONTENTS. 5 
ineral resources — Continued. Page. 
Petroleum and natural gas — Continued. 
Oil and gas rocks — Continued. 
Oil and gas sands — Continued. 
Drillers' names 48 
Murphy sand 49 
Dunkard sand 49 
Gas sand 50 
Salt sand 50 
Big Injun sand 50 
Squaw sand 52 
Thirty-foot sand. 52 
Gantz sand 52 
Fifty-foot sand 54 
Gordon Stray sand 55 
Gordon sand 55 
Fourth sand 57 
Fifth sand 57 
Bayard sand 58 
Elizabeth sand 58 
Beds below the Elizabeth sand 59 
Production of oil and gas 59 
Washington oil field 59 
Fonner oil field 61 
Zollarsville gas field 61 
Miscellaneous wells 61 
Pressure of natural gas 62 
Theory of oil and gas 62 
The ' ' anticlinal theory " 62 
Application in Pennsylvania 63 
Relation of oil and gas reservoirs in the Amity quadrangle to geo- 
logic structure , 63 
Washington field 63 
Examples of the anticlinal tendency of gas 64 
Zollarsville field 64 
Summary 65 
Origin of oil and gas 65 
Miscellaneous notes on oil and gas 65 
Character of the oil 65 
Composition of natural gas 66 
Waste of natural gas 67 
Value of good well records 67 
Records of wells in the Amity quadrangle 68 
Coal 88 
General statement 88 
Pittsburg coal 88 
General statement 88 
Mining operations 89 
Thickness 90 
Quality 95 
Methods of development 98 
Redstone coal 101 
Thickness 101 
Quality 102 
