THE 



JOURNAL OF GEOLOGY 



MAY-JUNE, 1899 



AMERICAN HOMOTAXIAL EQUIVALENTS OF THE 

 ORIGINAL PERMIAN 1 



In this country the Permian question has long remained open. 

 Its- various phases are essentially the same today as they were 

 forty years ago, when Permian faunas were first thought to be 

 identified in the rocks of Kansas. For nearly a quarter of a 

 century comparatively little information was added. Recently, 

 however, active interest in the subject has been renewed, and 

 new data have been acquired. With this revival of interest bob 

 up also all the old questions. Concerning these there is as much 

 difference of opinion as ever. Besides, new problems are pre- 

 sented. 



In all of the discussions concerning the American Permian 

 which have taken place in past years certain important facies of 

 the theme have appeared to be wholly overlooked. In the 

 newer considerations there is also a manifest tendency to pass 

 over these very essential qualities. It seems pertinent, there- 

 fore, to consider briefly some of these phases of the subject. 

 The following notes and comments are to be regarded as sug- 

 gestive along the line indicated. No formal attempt is made to 

 correlate in detail the terranes mentioned. 



'Read before the Geological Society of America, December 28, 1898. 

 Vol. VII, No. 4. 321 



