66 
HAROLD’S DISCUSSIONS. 
period. They are extensively quarried and used for 
building-stone. Many of the brownstone fronts of 
Staten Island, in New York, were taken from these 
beds. These Connecticut Kiver beds ” have become 
famous for the many curious marks found on them. 
In the London Museum is a slab taken from these 
beds, six by eight feet, on which may be seen more 
than seventy tracks. Most of the tracks are from ten 
to twelve inches in length ; the largest is fifteen inches 
long. 
In Wyoming and Colorado Professors Marsh and 
Cope found some striking fossils belonging to this 
Fig. 35.—Stegosaur, a land reptile of Jurassic age. Small head 
and brains, combined with large body, protected by huge 
bony plates. 
period. The skeleton of one of these fossils is now 
in Yale College. Its thigh-bones are over six feet 
