530 PKOCEEDINGS OF THE \VA8HINUT0X MEETIXU 



stone with "a few pebbles," having its base at 1,817 feet above tide. West 

 of Bradford it is found up Marilla creek, and west of Marilla summit it occurs 

 on Corydon creek. It is again foiind west of the Allegheny river, both in Penn- 

 sylvania and south of Steamburg in New York, and from its elevation, its posi- 

 tion in the section, and its lithological character, as well as by its tracing west- 

 ward, I conclude that it is the same as the Pope Hollow conglomerate, which may 

 be traced south from Pope Hollow past Fentonville and Russelburg by exposures 

 at intervals along either valley wall of the Conewango to the Asylum quarry at 

 north Warren. It may be traced westward up Rhinds run or Jacksons run by 

 numerous exposures to a point on Jacksons run about 2 miles east of Chandlers 

 valley. All exposures from here to Sugar Grove are covered with glacial till, but 

 it is quarried a short distance west of Sugar Grove, is found just above the mouth 

 of the Lottsville well No. 1,* and may be traced at intervals along the Little 

 Brokenstraw valley northward past Grant station until there can be no doubt of 

 its being the Panama conglomerate. Tracing it southward from Lottsville it passes 

 about 225 feet beneath the Wrightsville conglomerate at Wrightsville and is doubt- 

 less the pebbly sandstone found "about 100 feet from the surface" in the Rocky 

 Hollow well t about a mile northeast of Wrightsville. It seems probable that far- 

 ther south this Salamanca-Pope Hollow-Panama conglomerate may be the same as 

 the third Venango oil sand if that sand has a northward representative at all. In 

 this northwestern part of Warren county the shales and thin, soft, micaceous sand- 

 stones that extend for a couple of hundred feet above the Panama conglomerate 

 weather into a steep but smooth slope that is highly characteristic and bears when 

 cleared, as it usually is, a characteristic vegetation. These shales, with their char- 

 acteristic topography and vegetation, often aided in tracing the underlying Panama 

 where it was not exposed or had even dipped somewhat beneath drainage level. 



WRIGHTSVILLE CONGLOMERATE 



The Wrightsville conglomerate can not be identified with the Panama, but lies 

 about 225 feet higher in the section. It seems reasonable to suppose that it is the 

 equivalent of the Venango first sand, as is believed by Lesley, though no attempt 

 was made by the writer to trace it to a connection with that sand. J 



OLE AN AND SVBOLEAN CONGLOMERATES 



The Olean conglomerate was found on Mount Kaub near Bradford, and occurs on 

 the hills south of Bradford, decreasing gradually in elevation until it is last ex- 

 posed in the Bufialo, Rochester, and Pittsburg railway cut just north of Bingham 

 station as an irregularly bedded sandstone. Here it dips under the plateau sur- 

 face. No examination was made of the region south of the divide where it doubt- 

 less reaj)pears. The Olean conglomerate and the Shenango conglomerate and 

 shale are traceable westward across Warren county. All occur on Quaker hill and 

 at Pikes rocks and elsewhere. The Olean occurs at Millers rocks, but tiie She- 

 nango seems to have been cut out there just as its equivalent, the Knapp formation, 

 lias been near the head of Irish brook and elsewhere, as previously noted. 



*See J. F. Carll : Second Geol. Survey of Pennsylvania. Report I 4, pp. 199, 232. 



+ J. F. Carll: Second Geol. Survey of Pennsylvania, Report I 4, p. 2.36. 



X For the opinions of the geologists of the Second Pennsylvania Survey on the correlations of 

 the various members mentioned in the preceding paragraphs see I. C.White, Report Q4, pp. »9- 

 116; J. F. Carll, Report 3, pp. 57-80, and 4, pp. 195-208, and pp. 301-308 (F. A. Randall); J. P. 

 Lesley, Summary Final Report, vol. 2, pp. 1493-1530. 



