324 C R. KEYES 



SECTION OF UPPER CARBONIFEROUS TERRANES OF KANSAS 



Relations of Texas sectio?i. — In northern and central Texas the 

 beds called Permian are well developed. Cummins separates 

 the succession into three parts, which he terms the Wichita, the 

 Clear Fork, and the Double Mountain, each being regarded 

 about 2000 feet thick. According to this author, the section of 

 the Paleozoic above the lower Carboniferous is : 



CARBONIFEROUS TERRANES OF NORTHERN TEXAS 



Terrane 



Thickness 



Character 



Double Mountain. 



Clear Fork 



Wichita 



Albany 



Cisco 



Canyon 



Strawn 



Millsap 



Lower Carboniferous . 



2075 



1975 



1800 



Wanting. 



840 



930 



950 



1000 



Shales, red, sandy, often saline, with some 

 earthy limestones, and much gypsum. 



Limestones, and calcareous reddish shales, 

 some sandstone. 



Shales and sandstones, and some conglom- 

 erates. 



Limestones. 



Shales, with coal beds. 



Limestones, with shales. 



Shales and shaly sandstones. 



Shales, with coal beds, and shaly sandstones. 



Just what parallelism should be instituted between the Texas 

 and Kansas beds is not yet quite clear. The apparent enormous 



