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THE POPULAR SCIENCE MONTHLY 



subject to occasional inundation when the advancing waters covered what 

 had been land, while their retreat laid bare wide areas which had been 

 submarine. The evidence of this was before our eyes, for as we went 

 westward down the canyons, the sea shells would betray the marine 

 origin of the strata, then as we climbed the slope beyond Buck creek 

 we could see the older sea-borne sediments pass beneath the newer 



$&**<.** 



Fig. 2. Lignite Beds in the Lance, indicating the abundance of vegetation. 



Lance formation and become replaced by shales and sandstones of 

 fresh-water origin. Occasionally one came across beds of lignite or 

 woody coal which pointed to an abundance of vegetation, either forest or 

 swamp lands wherein plants must have grown luxuriantly. 



Out of this classic locality have come the remains of a host of 

 creatures, the inhabitants of the shores of the old Cretaceous sea, many 

 of which are now preserved in the Peabody Museum at Yale, the spoil 

 of former expeditions. These are mostly dinosaurs, land-living reptiles 



