54 C. S. PROSSER — PERMO-CARBONIFEROUS AND PERMIA.N ROCKS. 



Conclusion. 



The filial correlation of this series of rocks is one of the most interest- 

 ing problems yet to be settled in American geology. In this paper the 

 Avriter has attempted to give a brief review of the previous work and 

 opinions of the geologists who have studied this series of rocks ; has 

 called attention to the important horizons of their sections, stating where 

 the}^ may be seen in the field, and has noted the portions of their work 

 which later studies have made particularl}^ important. In a following 

 paper the writer hopes to take up the question of the general correlation 

 of these beds and to consider especially their fauna with regard to range 

 and distribution of species as an aid to the determination of the age of 

 these formations. 



Washburn College, Topeka, Kansas, June 16, 1894. 



