IMPRESSIONS OF THE PAST 47 



we learn that when these prints were made, or 

 shortly after, a strong wind blew from the 

 southeast, for on that face of the ridges bound- 

 ing the margin of each big footprint, we find 

 sand that lodged against the squeezed-up mud 

 and stuck there to serve as a perpetual record 

 of the direction of the wind. 



REFERENCES 



Almost every nuLseum has some specimen of the Con- 

 necticut Valley footprints, hut the largest and finest col- 

 lections are in the museums of Amherst College, Mass., 

 and Vale University, although, owing to loch of room, 

 only a few of the Yale specimens are on exhibition. 

 The collection at Amherst comprises most of the types 

 described by Professor E. Hitclwock in his ^^ Ichnology of 

 New England," a work in two fully illustrated quarto 

 volumes. Other footprints are described aTid figured by 

 Dr. J. Deane in '^Ichnographs from the Sandstone of 

 the Connecticut River." 



Fig. 8. — The Track of a Three-toed Dinosaur. 



