1891. J 4< [Carter and Lesley. 



deposition of these Ordovician or Lower Silurian limestone beds than is 

 the silica in quartz form which they contain. 



The beds are highly tilted to the south ; therefore the vertical hole ex- 

 aggerates the thickness. The formation is probably " Calciferous " No. 

 Ila, but no fossils have been found just here. No record of water ob- 

 tained. 



Artesian Well in Potsdam Sandstone, in Montgomery County, Pa. 



Notes by 0. C. 8. Carter. 



Drilled on William Janeas' property, near Williams Station, at the 

 crossroads, south of Lancasterville, and east of Spring Mill, the Plymouth 

 Railroad sweeping around it on the southwest. 



64' Sandstone {Potsdam No. I), coarse to 64' 



6 Sandstone, fawn colored, micaceous 70 



10 Sandstone, light brown, fine 80 



10 Sandstone, coarse, micaceous, transparent quartz 90 



22 Sandstone, fine, micaceous 112 



6 Sandstone, very coarse, larger fragments of quartz, 



with red iron stains 118 



4 Sandstone, coarse 122 



4 Sandstone, fine, grayish brown 126 



4 Sandstone, coarse, fawn colored 130 



2 Sandstone, fine, resembling ground ginger 132 



No conglomerate like that of the Willow Grove Potsdam outcrop passed 

 through ; beds tightly laid so that water crevices were few and insignifi- 

 cant. No water struck until the drill reached 80. Water rose and stood 

 at 70. Steam pump delivered only 300 gallons per hour ; water falling 

 10 feet after pumping 10 hours. 



Artesian Well of Chalybeate Water, in Chester Valley Clays, near King of 

 Prussia, Montgomery County, Pa 



Notes (condensed) of Pi^of. Oscar C. 8. Carter. 



Drilled on William Thomas' land ; 90 feet deep ; water, deep brown 

 (cider) color, even after 30,000 gallons had been drawn by a steam pump 

 in three days ; bubbles of carbonic acid gas constantly escaping ; water 

 not clear after standing several days ; precipitate, analyzed, was car- 

 bonate of iron ; precipitation not complete after a week. 



35' Yellow clay to 35' 



10 Layer of rounded pebbles of white quartz, resembling 



those on the sea shore 45 



