^44 Annals of the Carnegie Museum. 



thickness. Other specimens in our possession are very thin slabs 



which resemble pieces of compressed peat both in color, texture, and 



weight. They are very delicate and frail, but preserve remarkably 



well the outlines of the remains imbedded in them. Upon one of 



them I am able to detect a foot-print, apparently that of a batrachian. 



Carnegie Museum, 

 July 20, 1920. 



