Lesley.] «>4b [Dec. 15, 



Oil Well Records, selected from the collections of Mr. J. F. Carll, Assistant 

 Geologist in charge of the Geological Survey of the Oil District of Penn- 

 sylcania. Communicated by J. P. Lealey, State Geologist. 



{American Philosophical Society, Dec. 15, 1876.) 



I hope to present at another meeting my views of the vahie of these re- 

 cords, and an analysis of the conclusions arrived at by Mr. Carll from a 

 comprehensive study of many hundreds of such records collected by him 

 during the last three years, since the commencement of the Second Geo- 

 logiciil Survey of the State in 1874 ; as well as from his practical experi- 

 ence of operations in the Oil Region since 18Gij. 



The scientific value of well records is indeed limited by many conditions, 

 each of which should be separately considered. But there can be no 

 question of the utility of preserving them from destruction by publisliing 

 them in the printed archives of a society like this. Their publication will 

 answer many questions i)ut by men of science abroad and at home ; will 

 place at the service of investigators the original dataof our own calculations ; 

 will invite the intelligence of thoughtful men in the Oil Region to a more 

 careful scrutiny of such data ; and above all, will induce many well borers 

 to be more precise and complete in making up future records, and perhaps 

 to communicate them for com])arison. In this way only will it be possible 

 to arrive at broad and true answers to moot questions which no one has 

 yet succeeded in satisfactorily answering, except in a very local and un- 

 connected manner. 



Technical names and terms ought to be explained to those who have no 

 business at the wells, but such a glossary would be a long one. 



The height of each well mouth above the fixed ocean level datum of the 

 Coast Survey should always be given ; but it is olten wanting, and then 

 the value of the well record becomes comparatively low. 



The Avell records of one locality have been grouped together ; but it 

 must be understood that not one in ten has been obtained, and the whole 

 list is therefore but a meagre selection. 



The first groups have been obtained from Companies operating in "War- 

 ren and Venango Counties ; others might have been added from Clarion 

 and Butler Counties as specimens of the collections made in those Coun- 

 ties, to be published hereafter to show the geological persistency of the 

 Oil-Sand Group from Tidioute to Butler. 



Colorado Well, No. 1. 

 August 12th, 1870. 



Located in Warren County, Southwest Township, Pa. on Pine Creek, 

 or East Oil Creek, between Plcasantville and Tidioute, and two miles north- 

 east of Enterprise. 



Level of well mouth above ocean level in feet.* 1367 



Casing to rock 36 to 36 = 1331 



* On tho provisional iissuinptiim that Oil Cily Depot is 99.V above mean high 

 tide P. li. R. datum; and 7' added for ocean level in Haritan Bay. 



