242 



GEOLOGY. 



Fig. 142. 



stride, as shown by the tracks, from four to six feet, and 

 it is supposed that it reached a height of 14 feet. A 

 very singular track is represented in Fig. 143. An im- 

 pression like a brush extends back from the foot. It is 

 supposed that the heel was covered with ridges, which 

 made these lines. 



347. A Stone Fossil Book. A book with stone leaves 

 has been deposited by Professor Hitchcock in the Am- 

 herst Ichnological Cabinet. It is a book of five leaves, 

 nineteen inches long by eight in width, each leaf being 

 about an inch thick. The impressions of the tracks of 

 an animal are on all the leaves, corresponding in position 



