DINOSAURS. 



81 



feet by six feet, and bears upwards of seventy distinct impressions 

 disposed in several tracks, as shown in Fig. 14. The lines were 

 added by Dr. Hitchcock, who has published full descriptions in 

 order to show the direction and disposition of the tracks. 



In a presidential address to the Geological Society, Sir Charles 

 Lyell, speaking of the Connecticut Sandstone and its impressions, 

 said, " When I first examined these strata of slate and sandstone 

 near Jersey City, in company with Mr. Red field, I saw at once 

 from the ripple-marked surface of the slabs, from the casts of 



FIG. 15. Portion of a slab, with tracks. (After Hitchcock.) 



cracks, the marks of rain-drops, and the embedded fragments of 

 drift-wood, that these beds had been formed precisely under 

 circumstances most favourable for the reception of impressions of 

 the feet of animals walking between high and low water. In the 

 prolongation of the same beds in the Valley of Connecticut, there 

 have been found, according to Professor Hitchcock, the footprints 

 of no less than thirty-two species of bipeds, and twelve of quad- 

 rupeds. They have been observed in more than twenty localities, 

 which are scattered over an area of nearly eighty miles from north 



G 



