Lesley.] 



236 



[April. 



of coal-beds in oil well records. The interesting point of this section 

 is the limitation of the Barren Measures to about 50 + 538 + ? = say 

 600 feet. 



The following is a record of 844 feet of St. Mary's Well, on Se- 

 wickley Creek, about a mile from Chestnut Ridge, in Mt. Pleasant 

 Township, Westmoreland County, Pennsylvania, furnished by Mr. 

 S. S. Jack, of Pleasant Unity. 



Mouth of well, geologically, about 50 feet below Pittsburg Coal- 

 bed; and a quarter mile east of its outcrop. 



Slate rock, 40 feet. 



Eeddish rock, 12 to 52 



Soapstone, 10 to 62 



Hard rock, 12 to 74 



Soft rock (water crevice at 86 feet), . . 12 to 86 



Reddish rock, 14 to 100 



Hard blue rock, 70 to 170 



Block slate or shale; (1st oil-show at 184), . 14 to 184 

 First sand rock, hard, white, . . . 96 to 280 



(Very large water vein at 280.) 

 Gray rock (2d oil show and gas at 427), 

 Black rock, 

 lAmestone, 



Second sand rock, 



Horseback, 



Coal-hed [Elk Lick coal ?], 



Third sand rock, white, 



Hard gray rock [Mahoning S. S. ?], 



Coal-hed [Upper Freeport?], 



Fourth sand rock, white, 



Dark rock, 



Soapstone, 



Fifth sand rock, white, 



Limestone [Freeport], 



(Salt water crevice at 778, gas very strong.) 



Sand rock, very hard, . . . . 66 to 844 



The rest of the record of this well is not at present obtainable. 

 Mr. Jack was good enough to forward 14 samples of both rock and 

 coal; adding : <' We expected to find a small bed of coal within the 

 first hundred feet ; but it was not noticed ; although found in a well 

 bored a short distance, say 70 rods, southwest ; and also in gigging 



147 to 427 

 46 to 473 

 70 to 543 



15 to 558 

 7 to 565 

 7 to 572 



30 to 602 



65 to 667 



2 to 669 



30 to 699 



16 to 715 

 16 to 731 

 24 to 755 

 23 to 778 



