PRODUCTION 647 



to 35,848,777 in 1891 and 36,618,171 in 1900, after which it slowly de- 

 clined to 24,101,048 in 1914. 



The following table gives an analysis of the production in 1914, while 

 figure 2 shows by curves the relation of the Appalachian production to 

 that of certain other American fields : 



1911^ Production in Appalachian Field 



Average daily yield 



f ^ ^ Total 



New wells All wells production 



(barrels) (barrels) (barrels) 



New York 2 .2 938,974 



Pennsylvania 3 .4 8,170,335 



Southeastern Ohio 14 .7 4,809,265 



West Virginia 23.5 1.8 9,680,033 



Kentucky 13 1.3 502,441 



Entire field 10.5 .6 24,101,048 



Comparing the Appalachian with other important American fields, it is 

 found that its production in 1914 was about 3,000,000 barrels more than 

 that of Illinois, 4,000,000 more than Texas, 3,000,000 more than Mexico, 

 and 10,000,000 more than Louisiana. 



The production for 1914 was slightly more than that of Mexico, twice 

 that of Eoumania, twice that of the Dutch East Indies, three times that 

 of Burma, and five times that of Galicia. The only foreign field sur- 

 passing the Appalachian in production is that of Eussia, whose output in 

 1914 was a little over two and a half times that of the former district. 



Future of the Appalachian Oil Field 

 ■in general 



The problem of the future development and length of life of the Appa- 

 lachian oil field is one into which many factors enter, the influence of 

 several of which cannot be determined at this time. Some of the more 

 important evidences bearing on the future of the field are considered in 

 the following paragraphs : 



EVIDENCE OF STRATIGRAPHY 



In Pennsylvania and northern West Virginia there are approximately 

 3,500 feet of Carboniferous beds and 4,000 feet of Devonian shales which 

 contain sands likely to be productive of oil or gas. Of the 37 oil sands 

 listed in the table on page 633, 15 are in the former and 22 in the latter. 

 The production from the Devonian has far exceeded that from the Car- 

 boniferous. 



Going southward, the Devonian increases somewhat in thickness in the 



