172 



SKETCHES OF CREATION. 



Swallow, Meek, and Hall. The Permian rocks west of the 

 Mississippi have more recently been subjected to thorough 

 investigations by Swallow, Meek, Hayden, and Shumard ; 

 and though much of what was first regarded as Permian 

 is now proven to belong to the period of the coal-measures, 

 we know that this group of sediments is developed in Amer- 

 ica on a scale little less magnificent than in the ancient Rus- 

 sian kingdom of Perm, which gave its name to the group. 



Fig. 69. Labyrinthodon (restored). 



