OKLAHOMA ACADEMY OF SCIENCE 93 



ture is seen to be a narrow plunging anticline which may be slightly 

 faulted, and to this fold the name of "Woodford Anticline" has 

 been given. 



Still another place where greater detail is needed on this map 

 is in the contact of the older formations in the mountains with the 

 younger ones in the adjacent plains. This contact is drawn in a 

 very generalized way while in fact there are outliers of the Permian 

 on top of the older formations and inliers of the older formations 

 out beyond the general eastern margin of the Permian. Formations 

 of various ages abut against the mountains in different parts and 

 the age of some of these surrounding formations is not known, 

 and there has been a great deal of disagreement among geologists in 

 regard to them. Only a comprehensive study of the whole region 

 is likely to clear up these difficulties and locate the formations in 

 their proper places. 



Besides the need of a new geologic map of greater detail and 

 accuracy for the reasons enumerated above, scientific information 

 of this sort placed on a new map has a distinct economic aspect. 

 The structure of oil fields near mountains commonly is related to 

 the trend of structure in those mountains. This relation may be 

 closer to the trend of the major folds, or to minor ones transverse 

 to the major folds, depending upon the location of the area in ques- 

 tion. Then, too, in the erosional history in the mountains and the 

 deposition about them is locked up the problems of the distribu- 

 tion, composition and texture of formations about them. These 

 considerations are important for upon these characteristics of the 

 rocks together with their structure depends the formation and 

 accumulation of the oil and gas. 



In June of last summer a field class of students from the 

 University of Oklahoma under the direction of the writer mapped 

 15 square miles topographically and geologically on a scale of four 

 inches to the mile. During the progress of this work the advantages 

 of a new map were made evident, and at the close of the course, 

 the writer was given supervision of making a new geologic map 

 of the Arbuckle mountains by Mr. C. W. Shannon, Director of the 

 Oklahoma Geological Survey. A party was organized consisting of 

 the geologist in charge, four field men, and a cook, and during the 

 last month of the summer vacation nearly 100 square miles of 

 the Arbuckle mountains were remapped geologically on a scale of 

 four inches to the mile. 



Note: Since the meeting of the Oklahoma Academy of Sci- 

 ence, G. H. Girty and P. V. Roundy gave a paper at the Shreveport 

 meeting of the American Association of Petroleum Geologists, 



