INDEX. 
A. 
Page. 
Acknowledgments to those aiding. 10 
Alexander, S. Z., well of, log of. 100 
Allegheny County, Pa., detailed geology of. 116 
Allegheny formation, character and distri¬ 
bution of.80-82 
position of. 89 
Ames limestone, character and distribution 
of. 79-80, 
88,00,93,04,05-96,98,114,115,123 
position of. 30,88,89,00,93,94,98 
plate showing. 30 
use of, as key horizon.".. 27-28,38 
Andrews, W., well of. 108 
Appalachian oil fields, conditions in. 12-13 
diagrammatic section of, explanation of. 15-16 
plate showing. 10 
geology of. 12,18-21 
oil in. 
accumulation of. 15-17 
Arnold, William, heirs of, well of... 108-109 
Atcheson, M. M., well of, log of. 143-144 
B. 
Bailey, W. S., well of, log of. 145 
Barclay farm, well on, log of. 106 
Bavington coal, character and distribution 
Of. 115,120 
position of. 120 
Bayard sand, occurrence of. 86 
Beaver County, Pa., detailed geology of- 114 
Bell, J. G., well of, log of. 145 
Bench marks, lists of. 176-189 
maps showing. Pocket (Pis. Ill, \ II) 
Benharn Run, section on. 167 
Benwood limestone, equivalent of, descrip¬ 
tion of. 69-70 
occurrence of. 87,89,91,93,97,118, 
121,125-126,152,154,157,162-163,165 
position of. 127 
Berea sand, character and distribution of.. 84-85, 
99-109 
correlation of. 109-113 
deposition of. 19-20 
fluids in. 16,17 
gas in. 3;) 
map showing. 80 
discussion of. 33-36 
oil in.9,33-36 
position of. 30,44,123,130,146 
map showing. Pocket (PI. \ I) 
structure of, map showing... Pocket (PI. VI) 
Berry heirs, well of. 140 
Big Dunkard sand, gas in. 62 
Page. 
Big Injun sand, character and distribution 
of. 84,99-105,107,110,112 
fluids in. 16 
gas in. 62 
oil in. 33 
position of. 44,113,117,120,123,129,132-146 
Big lime, position of. 138 
Bitter Rock sand, character and distribu¬ 
tion of. 84 
correlation of. 113 
occurrence cf. 111,112 
position of. 117,132-136,143-146 
salt water in. 44 
Blaine Township, Pa., detailed geology of. 159-163 
Bluck, C. & W., well of.. 104 
Bluck pool, description of. 35 
Blue limestone, position of. 122,126 
Brooke County, W. Va., detailed geology of. 96-98 
Buchanan farm, well on, log of. 136-142 
Buffalo Creek, probable oil field near. 64 
Buffalo gas field, description cf.62-63 
Buffalo Township, Pa., detailed geology of. 157-159 
Buffalo Township, W. Va., detailed geology 
of. 96-98 
Bulger limestone, character and distribution 
of. 70,121 
position of. 119,122,126,129,131 
use of, as key horizon.38-39 
Burgettstown pool, description of. 46-47 
Burgettstown quadrangle, area and location 
of. 9,37 
bench marks in. 181-186 
convergence in. 41-43 
determination of. 132-148 
plate showing. Pocket (PI. VIII) 
gas wells in, location of, map showing.. 
Pocket (PI. IX) 
geologic section (general) in. 67 
geology, detailed, of. 114-131 
geology, general, of.37-47 
Hundred-foot sand, map of. Pocket (PI. IX) 
map of, discussion of. 4.5-47 
key horizons in.38-40 
maps showing ... Pocket (Pis. VII, IX) 
maps of. Pocket (Pis. VII, IX) 
oil pools in. 46-47 
oil sands in.9,42-45 
oil well in, location of, map showing.... 
Pocket (PI. IX) 
rocks of.37-38 
structure of. 40-41 
topography of. 37 
wells in. 108-109 
191 
