NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 



13 



correspond in a general way with the line drawn by Mr. Cummins as separating 

 tne Carboniferous and Permian.'' 



"The distinctions which have been thus far outlined in Kansas do not hold 

 when the rocks are followed southwestward along their strike into the Indian 



Fig. 2. — Map showing relation of Permo-Carboniferous limestones and Red 

 Beds in Kansas, Oklahoma, and Texas. (From Adams.) 



Territory. Approximately along the Arkansas River, or a little south of that 

 stream, the interstratified limestones disappear from that section, and the forma- 

 tions are accordingly shales and sandstones. Moreover, the rocks in the Indian 



" A full description of conditions, with maps, is given by Adams in Bulletin of the Geological Society 

 of America, vol. 4, p. 191, and U. S. Geological Survey Bull. 211, p. 71, 1903. 



