Ashburner.] ' ' ' | i.ug. 16. 



gether with a fuller description of the facta obtained, will be published in 

 the District report. 



Ii i- due Mr. Bale to state thai the Dennis record is. without doubt, the 

 longest detailed and accurately measured record of any oil well in the 



United States. Deeper wells have been drilled, hut no record has ever 



been kept so accurate as this one to such a depth. Wherever the rock 

 passed through by the drill was found to change a specimen was secured ; 

 in many cases a number of specimens of the same stratum were kept, in 

 order thai after a more careful study the horizons or divisions mighl be 

 shifted the better to agree with the true succession of the strata. 



[hope to deposit a duplicate seiies of specimens in the museum of the 

 Philadelphia Academy of Natural Sciences, and it is hoped that duplicates 

 may be deposited in other museums throughout the States. In view of this 

 fact, I Lave given below the numbers of the specimens obtained of each 

 stratum. The elevation of the top of the well above Ocean in feet is 2055. 

 The elevation of the Bradford Station of the Bradford Branch of the Erie 

 Railway being 1444 feet 



Surface (days 4' to 4' 



Sandy shale, olive-gray, micaceous, muddy; spec. 1 11 " 15 



S. S. gray, fine, micaceous, muddy; specs. 2, 3, 4, 5 38 " 48 



Shale dark-gray, with thin micaceous sand shells, muddy ; 



specs. 6, 7 19 " 67 



S. S. gray, fine, soft, muddy ; spec. 8 8 " 75 



Slaty sandstone, bluish, tine, muddy; specs. 0, 10 23 " 08 



Fine gray sand-shells and dark slates alternating, muddy : 



specs. 11,12, 13 18" 116 



S. S. ashy gray, very fine micaceous, muddy ; specs. 14, 15.... 10 " 132 



Red shale, soft ; spec. 16 6 " bis 



S. S. olive gray fine micaceous ; spec. 17 12 " 150 



S. S. dart olive gray, fine micaceous ; specs. is, 1'.', 20 30 " 180 



S. S. white, mixed with green and brown, tine ; spec. 21 8 " 188 



S. S. bluish gray, fine, micaceous, muddy ; spec. 22 !) " 107 



Red shale, " paint rock " top soft, bottom sandy and micaceous , 



specs. 23, 24, 25 18 " 215 



S. S. gray, tine, mixed with slate, a few pebbles; specs. 2(1, 27.. 23 " 23s 



Slate, bluish ; specs. 28, 21), 30, 31 22 *' 200 



Slate, bluish, with thin plates of fine sandstone ; specs. 32, 33.. 15 " 275 



Sandy slate, dark gray, fine, micaceous ; specs. 34, 35, 36 Hi " 291 



Slate, bluish : specs. 37, 38, 39 24" 315 



S. S. -ray, line, micaceous; spec 40 5 " 320 



Red slate, micaceous, muddy ; spec. 41, 42 8 " 328 



S. S. obve gray, soft, micaceous, some slate; specs. 43, 44, 45. 39 " 367 

 1! d rock, mottled sandy shale, brown, green and gray ; specs. 



46,47 ' 15" 382 



Slate sandy, gray ; spec. 4s 8 " 390 



S. S. dark, very tine : specs. Ill, 50 10 •' 400 



