1891.] 45 [Carter and Lesley. 



Water was first struck at 38 ; again at 05 ; nowhere else. Water Btands 

 at 15 feet of the surface ; yields GO gallons per hour ; drops 25 feet after 

 pumping 6 hours. 



Evidently the Stony creek water soaks slowly through the hed planes 

 between the clay slates. 



Artesian Well in Lower Silurian Limestone, in Montgomery County, Pa. 



Drilled on Charles Kunkle's farm, south side of the Valley Green road, 

 east of the Bethlehem pike, north-northeast of Flourtown. 



40' Limestone, not micaceous to 40' 



20 Limestone, micaceous GO 



Water first struck at 40' ; depth of well 60' ; several small "crevices ;" 

 water stood at 35 feet beneath the surface, and was not lowered by steam 

 pumping 500 gallons per hour. 



Artesian Well in Lower Silurian Limestone, at Parkesburg, Pa. 

 By Prof. J. P. Lesley. 



Mr. P. H. Gibbons, Vice President of the Parkesburg Iron Co., at 

 Parkesburg, Chester county, Pa., was good enough to furnish me by letters 

 dated January 1, February 9 and February 11, 1886, with fragmentary 

 notes of the boring, and forty-five samples for examination, which I have 

 in bottles, the depth in feet recorded on the corks, and finely powdered 

 specimens on glass slides for microscopic use. 



Soil, first passed through 18' 



Limestone struck at 20 



Quicksand encountered at 23 



Cased quicksand out at 24 



Limestone ("bastard "), more dense and solid to 42 



Quicksand again at 42 



Limestone to 53 



Quicksand, with flow of water at 53 



Limestone, purer to 92 



Sandstone, yellow, fine grained, 7' thick to 99 



Limestone, of varying qualities, sometimes sandy, "then 



mica, then lime or marble ;" no water to 174 



Limestone, of varying nature to 522 



Specimens examined under the lens, at the following depths: 



27' Resembles a sandstone, light gray, with white fracture, some 



quartz crystals and a show of mica. 

 32 Same as above, with a trace of iron oxide. 



