TITLES AND ABSTRACTS OF PAPERS 195 



The following papers were then presented : 



OIL POSSIBILITIES ALONG THE SOUTHERN MARGIN OF THE BLACK HILLS. 



SOUTH DAKOTA 



BY ROY R. MORSE ^ 



{Abstract) 



Domed structure on the southern margin of the Black Hills uplift is dis- 

 cussed. Oil-bearing strata of the not remote Wyoming fields are preseut. 

 Certain localities of their outcrop in the Black Hills are saturated with oil. 

 Results of drill tests here confirm the conclusion that such "favorable indica- 

 tions" are not alone sufficient. By analogy with the structural position of 

 producing fields, it is apparent that the relation between local structure and 

 regional structure is, at the points tested, unfavorable. The relations between 

 minor structures, such as domes or terraces, and the major structural features 

 of a province, with the resultant conditions of gathering ground for oil and 

 water, are here, as elsewhere, of prime importance in the search for accumu- 

 lations of commercial value. Assuming uniform porosity conditions, the per- 

 haps too-often assumed necessity of perfect "closure" — that is, "domes" — is 

 dependent upon the position of the local structure with respect to the major 

 structure of the region. The position of many important fields, both upon 

 "open and closed" structures, illustrates this feature. 



STRATIGRAPHIC AND AGE RELATIONS OF THE SCARP-PRODUCING FAULTS 



OF THE GREAT BASIN 



BY GEORGE D. LOUDERBACK 



(Abstract) 



The discussion is based in part on recent results of paleontological studies 

 in the Tertiary formations of the Great Basin and of California, in part on 

 the relation of the faulting to the volcanoes of the Sierra Nevada and the 

 Great Basin, and in part on the physiography of the various fault-scarps. 



Discussion 



W. D. Smith made comparison with conditions in Oregon; Bailey Willis 

 made comparison with conditions in Shantung, in the Danube region, and in 

 the Bernese Alps. 



Permission was granted to present a brief paper, entitled 



MIOCENE FISHES OF CALIFORNIA 

 BY J. Z. GILBERT 



(Abstract) 



Dr. Gilbert described the work in which lie had been engaged in the various 

 localities at which such fish remains ha«l been found and the general paleon- 



' lutroducpfl l)y C. I». I.oiiderback. 



