STATE GEOLOGIST. ~ 261 
That the field was a monopoly for no one is shown by the following 
list, which includes the chief operators of the district: 
Corning Oil Company; L. D. Langmade; 
Denman & Thompson; Harrington Brothers; 
O’Connel Oil Company; Ohio Oil Company; 
Brooks Oil Company; Church Oil Company; 
Caldron & Snyder; Monroe Oil & Gas Company; 
Sunday Creek Oil & Gas Company; Weaver Brothers; 
Perry County Oil Company; W. B. Irwin & Company; 
W. B. Barker & Company; George Best & Company; 
Cleveland Oil Company; Foster & Moran; 
Keystone Oil Company; Fallen Rock Company; 
W. E. Detlor; Ohlviler & Chambers; 
William Rosier; Mill Oil Company; 
J. H. Van Wormer; Hemlock Oil Company; 
Northeast Oil Company; John Holden; 
Becker Oil Company; Wells & Foraker; 
Allen, Sternberg & Company; Longfellow & Stevens; 
Bolivar Oil Company; Russell Metzger; 
Wiliam McMullen; McGee & Stewart; 
A. Bulger & Company; Stratton & Mark. 
Corning Natural Gas Company; National Oil Company. 
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Geology of the Region.—The surface of the territory lies in the 
Lower Productive and Lower Barren Coal Measures. The highest hills 
reach up to or extend above the Ames or Crinoidal limestone. In fact, 
along the northeast extremity of the field the hills are capped by the lime- 
stones, which underlie the Pittsburg coal. The deepest valley—that of 
Sunday Creek—cuts through the Middle Kittanning coal, a short distance 
north of Corning, but at this town the seam named is under cover, while 
the Upper Freeport coal is at about drainage level. 
The succession of strata under ground is shown by the following 
record kept and furnished the Survey by Mr. G. W. Delong, Superintend- 
ent of Schools, Corning. The well is located on lot 154 of the town just 
named, and the top of the well lies at the base of the Mahoning sandstone: 
Thickness of Total 
stratum. thickness. 
Feet. Feet. 
Sinner ee te pere ribs tae estat cet tes cei nace See ste ond aes 25 25 
ISAS Tawa lin Srapy sc uerere canoes tale, wa tears cr eueletey clause 15 40 
SEEN ING Aha uke Go do RN HOn Ie cE RONER Sea ROL ARE SOR Te eae 10 50 
COGS ENIOREG) riers c etsy overs: sare cscdiste eer eisne ts onesexs ss 10 60 
WA ee SIA TCH oaracreeceGstere mia iescc e tieve an aceiere Steere 65 125 
SDI espace aot eaeen ete eS Cee cn creer roece ote ieee tee 15 140 
Whiter Slave tiene ee oe eee Ss oogdo000b00C 25 165 
SIUC peers ckonserhec a otepte Arsene venue gee ile Sais ogo eogorous hats 10 175, 
DIN Deedee ctecdadie a peat sccic are Vansant Sctiape, sickene ec taenlelic: sar 10 185 
Ro al Omer cet ean suna tures peas peer ecece tet eostiowe laitbicl cele reColeielle. eye 50 235 
Sat epee. reece tired cost rae ane cate sl helen neces Se ys 35 270 
SSREHANG | oy ek mare Rate ee SC a Re oe ns on crc 30 300 
