OKLAHOMA ACADEMY OF SCIENCE 87 



at insufficient depths for lack of funds or other reasons; 1131 

 sections are being drilled as "wildcat ;" and 724 sections are 

 active since January, 1920. This is a total of 6987 sections of land 

 in the State under development. 



The total number of square miles in the productive areas is 

 15,650. The total number of square miles actually having pro- 

 duction is 3857. Therefore, the percentage of square mile produc- 

 tion for the producing areas of the State is 24 per cent. 



XXXIX. OKLAHOMA OIL RESOURCES 

 C. W. Shannon 



From tiie Oklahoma Geological Survey. 

 The discussion of Oklahoma's oil resources gave a historical 

 accoimt of the oil and gas development in Oklahoma, the number of 

 producing wells at the present time, and statistics on production 

 from 1904 to 1922. Estimates were made as to the amount of oil 

 which m;ght be expected in future production in Oklahoma. The 

 estimates as made by the Oklahoma Geological Survey were com- 

 pared with those recently made by the U. S. Geological Survey 

 and the result of both estimates is that there are sufficient oil 

 reserves in Oklahoma to make Oklahoma an important oil produc- 

 ing state for at least twenty years to come. A bulletin is being 

 prepared for publication on this subject by the Oklahoma Geological 

 Survey. 



XL. ARKOSE OF THE NORTHERN ARBUCKLE AREA 

 George D. Morgan 



From the Oklahoma Geological Survey. 



In the western part of Pontotoc County and extending north- 

 ward into Pottowatomie County and westward into McClain Coun- 

 ty is a thick series of arkosic beds which bear an important time 

 relation to the orogenetic movements of the Arbuckle area. The 

 writer suggests that ^these beds be known as the Pontotoc series. 



On passing downward through the stratigraphic column it 

 has been observed that the arkose terminates suddenly along a 

 very sharp contact line and that below this line no megascopic 

 feldspar is to be found through a section of more than 1,000 feet. 



At a point in the southwestern part of the Allen oil field, in 

 the eastern part of Pontotoc County there is a thin conglomerate 

 sandstone which is also slightly arkosic. The character of this 

 material, hov/ever, is quite different from that of the arkose to 

 the west and it is therefore concluded that its source was not tlie 

 same as that which contributed the Pontotoc series. 



