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The Hosmer Run oil rock corresponds with the Oil Sand No. 1, of the Petroleum Measures. 3d. The Second and Third Oil Sands are wanting in that more northern locality. CHAPTER VIL Drift. In addition to the local drift composing the " flats" of nearly- all the streams in this district, there are in many places large deposits of Drift of an entirely different character. The latter are more noticeable in localities within the range of the larger streams flowing from the north, and they contain many... speci- mens of rocks which could only have come from a remote dis- tance. Some of these accumulations, of considerable depth, may be seen on ridges elevated from 150 to 200 feet above the' present streams. On Magee Hill between Pleasantville and Titusville, a well sunk near what was supposed to be the base of one of these Drift deposits, and within 50 rods of the plain out-croppings of undisturbed strata, required 70 feet of pipe to reach the bottoni of the Drift. No large amount of this Drift has been noticed south of the Pleasantville ridge ; but small scattering boulders of foreign rock maybe found even on the slopes of Ennis Hill, the highest point in Venango county.
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