THE STRUCTURAL CLASSIFICATION 597 



White^^ at Eitchie Mines, West Virginia, may belong to this class, al- 

 though these deposits are also dependent in their original accumulation 

 on anticlinal and synclinal structures of Subclass 11(h). The source of 

 the West Virginia grahamite dike is believed to have been the Cairo oil 

 sand, which lies at a depth of about 1,300 feet from the surface; and 

 there is no doubt that either now or at an earlier period certain of the oil 

 was held in by the grahamite. 



The source of the albertite dike in Albert County, New Brunswick, is 

 believed to have been oil intruded from petroliferous strata and which 

 fills a large vertical fissure in the fine-grained Albert shales^^ of Lower 



Figure 19. — Cross-section of the Bustenari Fields Roumania 



After Bosworth, Petroleum Review, March 23, 1912, showing occurrence on overthrust 

 fault according to Subclass IX (c) 



Carboniferous or Devonian age. The fissure was in places as much as 17 

 feet wide and was mined to a depth of 1,300 feet. The albertite also fills 

 many branch veins in the wall rock. Many dikes of grahamite of similar 

 origin exist in Stephens, Pushmataha, and other counties in southern 

 Oklahoma. The uintaite (gilsonite) of Utah has been shown by Eldridge 

 to occupy a fractured zone in the central Uinta synclinal basin. Many 

 parallel vertical gilsonite veins exist from one-sixteenth of an inch to 18 

 feet in width and from a few hundred yards to 8 or 10 miles in length, 

 paralleling the mountains which border the basin. Oil will not be found 

 in proximity to all these dikes, as some of the bitumens show by their 



8« I. C. White : Bull. Geol. See. Am., vol. 19, 1899, pp. 277-284. 



«^ L. W. Bailey and R. W. Ells : Geol. Survey Canada, 1876-1877, p. 354 et seq. 



