BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 10, pp. 99-106, PL. 11 March 6, 1899 



GEOLOGICAL STRUCTURE OF THE lOLA GAS FIELD 



BY EDWARD ORTON 



(Read before the Society December- SO, 1898) 



CONTENTS 



Page 



Introduction 99 



Abundance and geologic relations of gas rock 100 



Discussion of occurrence in general 100 



Gas-bearing rocks 100 



Modes of occurrence , 100 



The classes 100 



Shale gas 100 



Reservoir gas 101 



Anticline and terrace 101 



Gas field under consideration 102 



Extent and character of field 102 



Geology of the region 103 



Sources of information 103 



The formations 103 



Coal Measures and sub-Carboniferous limestone 103 



Cherokee shales ... 103 



Other di'Visions 104 



Tola gas rock 104 



lola arch at Edwards well , 104 



Sti'ucture as a factor in interpretation 105 



Economic value 105 



Introduction 



In this country, at least, natural gas is advancing rather rapidly in 

 public appreciation and regard. It is found to be much more widely 

 distributed, both geographically and geologically, and to exist in much 

 larger quantity than an}^ one would have ventured to claim 20 or even 

 10 years ago. It is no longer an unusual thing for a village or city to 

 enjoy a more or less adequate supply of natural gas as a source of arti- 

 ficial heat and light. There are many such examples in New York, 



XV— Bur,i,. Geot,. Soc. Am., Vol. 10, 1898 (99) 



