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 museum has some specimen of the Con- 

 necticut Valley footprints, but the largest and finest col- 

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

 and Yale University, although, owing to lack 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. Hitchcock in his "Ichnology of 

 New England," a work in two fully illustrated quarto 

 volumes. Other footprints are described and figured by 

 Dr. J. Deane in "Ichnographs from the Sandstone of 

 the Connecticut River." 



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



