INDEX 
195 
Page. 
Sandstones, percolation in. 14 
positions of, mapping of.23-25 
structure of. 12 
Sankey farm, well on, log of.134-135 
Sapp, Joseph, well of, record of. 31 
Scott, James, well of, log of. 140 
Scott heirs, well of, log of.142-143 
Sedimentary rocks, deposition of. 19-21 
Sewickley coal, character and distribution 
of. 69,118,121,125-126 
position of. 38,119,122,126,127 
use of, as key horizon. 27 
Shale, origin of. 18 
Sixth sand, occurrence of. 86 
Slentz, J., well of. 101 
Smith, Alexander, well of, log of. 110 
Smith Township, Pa., detailed geology of. 117-120 
Somerset syncline, location and description 
of. 29 
South Franklin Township, Pa., detailed 
geology of. 170-172 
South Strabane Township, Pa., detailed 
geology of. 153-154 
Southerland, J. W., well of. 108 
Sparta coal, character and distribution 
of. 77,154,166-169,170-171,173-174 
Squaw sand, occurrence of. 110-111 
oil in. 44 
position of. 120,124,132-136,141-142,144 
Steubenville quadrangle, area and location 
of. 9,26 
bench marks in. 176-181 
Berea sand in, map of.Pocket (PI. VI) 
map of, discussion of.33-36 
convergence in.30-33 
determination of...99-109 
map showing. Pocket (PI. IV) 
gas fields in.35-36 
gas wells in, location of, map show¬ 
ing. Pocket (PI. VI) 
geologic section (general) in. 67 
geology, detailed, of.87-98 
geology, genera], of.26-37 
key horizons in. 27-28 
map showing. Pocket (PI. Ill) 
maps of. Pocket (Pis. Ill, VI) 
oil pools in.33-36 
oil sands in. 9,33 
oil wells in, location of, map show¬ 
ing. Pocket (PI. VI) 
rocks of. 27 
plate showing. 30 
structure in.28-29 
topography of. 26 
wells in.99-107 
Steubenville Township, Ohio, detailed geol¬ 
ogy of.92-93 
Stevenson, Andrew, well of. 132 
Stevenson, R. E., well of, log of. 146 
Stewart, L. E., well of, log of. 135 
Stratigraphy, description of.67-86 
plate showing. 30 
Stray-Stray sand, character and distribu¬ 
tion of. 86 
Strong, George, well of. 105 
Page. 
Studa, John, well of, log of. 135 
Sunbury shale, character and distribution 
of .:.... 84 
Swearinger, D. W., well of. 101 
T. 
Taylor Brothers, well of, log of. 144 
Taylorstown, sections near. 160-161 
Thirty-foot sand, occurrence of. 100,112 
oil and gas in. 45 
position of. 117,120,124,130,139-146 
Turkeyfoot pool, description of. 34 
U. 
Unconformity, between Mississippian and 
Pennsylvanian, occurrence of... 83-84 
Uniontown coal, character and distribution 
of . 70-71,91,94,96-97,118, 
121, 125-126, 152, 154, 157, 162-163, 165 
position of. 38,91,97,119, 4>2,126,127 
Upper Kittaning coal, character and dis¬ 
tribution of. 81 
P T ppcr Washington coal, character and dis¬ 
tribution of. 76-77, 
154-155,158,160,164,166-168,170-174 
Upper Washington limestone, character and 
distribution of. 75-76, 
149,153-155,160,174 
ina P of. Pocket (PI. X) 
discussion of. 52 
position of, map showing_Pocket (PI. X) 
section of. 157 
structure of, map showing_Pocket (PI. X) 
use of, as key horizon. 49-50 
V. 
Vance, J. S., well of, log of. 143 
W. 
Wallace, Mary, well of. 100 
Warwick, S. E., well of, log of. 102 
Washington anticline, gas in.,. 63 
location and description of.52-53 
oil near. 58,59,64-65 
Washington coal, character and distribu¬ 
tion of. 73,96-97,124-125, 
149-150,151,153,155,159,161-165,172 
position of. 49-50,97,125,127,128,129 
use of, as key horizon.39,50 
Washington County, Pa., detailed geology of 
114-131,149-175 
Washington formation, character and dis¬ 
tribution of. 67, 
71-76,117-118,127-128,130,153 
Washington sandstone, character and dis¬ 
tribution of. 72-73 
Washington-Taylorstown oil pool, descrip¬ 
tion of.58-61 
Water, salt. See Salt water. 
Watt, J. S., well of. 103- 
Waynesburg coal, character and distribu¬ 
tion of. 71,93,96-97,118,121, 
125,150,151-152,153,156,159,162,165 
position of... 39,50,97,119,121,125,127,129,131 
section of. 71 
