CONTENTS. ( 
Page 
To | >ographic data 134 
Triangulation station.- 134 
Meridian marks - 138 
Spirit-level data - L38 
Principal publications bearing on the geology of the Amity quadrangle and 
vicinity 140 
Index 141 
ILLUSTRATIONS 
Plate I. Economic geology map of the Amity quadrangle, with columnar 
section Pocket. 
II. Sections of deep wells in the Amity quadrangle and vicinity 22 
III. Sketch map showing geologic structure in region adjacent to and in- 
cluding the Amity quadrangle 38 
IV. A, Gantz well at Washington; B, Present appearance of oil operations 
on the Willetts farm, Washington oil field 44 
V. Sections of Pittsburg coal in the Amity quadrangle 92 
VI. Sections of the Waynesburg coal in the Amity quadrangle 106 
VII. A, Waterfall over Ben wood limestone, Union Township; B, Outcrop of 
Lower Washington limestone on Smith Run, Amwell Township .. 120 
V 1 1 1 . A, Outcrop of Pittsburg coal at base of Pittsburg sandstone in valley of 
Fishpot Run, East Bethlehem Township; B, Bluff of Waynesburg 
sandstone at Lone Pine on Little Tenmile Creek 1 28 
Fig. 1. Generalized section of beds below the Pittsburg coal 20 
2. Map of oil- and gas-producing areas in the northern Appalachians 43 
3. Map showing the diminution of interval between the Pittsburg coal 
and the Gantz sand 53 
4. Map showing area of the Pittsburg coal bed in Pennsylvania 89 
5. Generalized section of Pittsburg coal bed, with names of different 
benches 92 
6. Sections of the Redstone, Sewickley, Waynesburg "A," and Washing- 
ton coals in the Amity quadrangle 102 
7. Location of triangulation stations in and near the Amity quadrangle . 134 
