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. Redfield, I saw at once 
from the ripple-marked surface of the slabs, from the casts of 
Fic. 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 
