296 PROCEEDINGS OF THE ACADEMY OF [1886. 



July 27. 



Dr. J. Bernard Brinton in the chair. 



Thirteen persons present. 



A paper entitled " Histor}- and Biology- of Pear Blight," by J. 

 C. Arthur, was presented for publication. 



August 3. 

 Mr. Thos. Meehan. Yice-President, in the Chair. 

 Eleven persons present. 



Oriskany Sandstone in Lycoming Co., Pa. Mr. Lewis Wool- 

 man remarked that, accompanied by a resident of Lycoming Co., 

 Pa., he had recently made a tour through that and the adjoining 

 county of Sullivan', with an eye to the geological features of the 

 resion, using as a guide the most recent publications of the 

 Second Survey. In" Hand Atlas X, the Oriskany formation is 

 omitted from the map of Lycoming County, while the text speaks 

 of it as " being absent."' It is also omitted from the larger map 

 accompanying'the Second Survey. He was, therefore, surprised to 

 find on the roadside, at the village of Pennsville. Mimcy Town- 

 ship, blocks of the sandstone, containing its characteristic fossils. 



Further examination resulted in finding a belt of this forma- 

 tion ; not. however, making the bold, elevated ridge it so often 

 does elsewhere in the State, but existing as a prominence upon 

 the lower slope of the hill that rises from the north side of the 

 village, the ascent beyond being over the lower members of the 

 Hamilton group. Time at command being limited, the formation 

 was traced only about a mile, but without finding it to disappear. 

 The Friends' meeting house at one end of the village, and the 

 schoolhouse at the other end, both stand upon this ridge. The 

 former has its comers pointed with this sandstone, from an old 

 quarry in sight, while all around the latter are strewn weather- 

 worn fragments, beautifully exhibiting the fossils. Several of the 

 houses and barns intermediate are also situated upon this forma- 

 tion, and for some of these it has furnished building material. 



The location of the belt is within the area shown on the maps 

 as Hamilton, and a few hundred feet from the division there 

 marked as separating that group from the Lower Helderberg. 

 Along the lawn leading to the country residence of William 

 EUicott, the rock was seen in place, pointing upward over the 

 anticlinal forming Bald Eagle Mountain. A letter from his com- 

 panion states that he has since found this rock upon the other 

 side of the mountain, in Clinton township. 



