Fossil Footmarks found in Westmoreland County, Pa. 347 



made by the same animal, the ball stands out and completes the 

 digital circle. (Fig. 5, 6.)* 



Spheropezium ovoidaciylum, (fig. 6.) Toes 5, making an 

 ovoidal impression, spreading near 240°, about one inch long ; ball 

 of the foot spherical, nearly two inches across. Extreme spread of 

 the toes nearly six inches. From the last character we may judge 

 that this must have been the track of a very large animal. 



Fiff. 6. 



Reduced one half. 



The rock on which the tracks above described were found, has 

 an exposed surface of fifteen by twenty feet, rising like the other 

 rocks in the neighborhood to the west, and dipping at a small an- 

 gle to the east ; it is a coarse-grained sandstone, about one hun- 

 dred and fifty feet beneath the largest of our coal seams, and near 

 eight hundred feet beneath the topmost stratum of our coal form- 

 ation. From the existence of numerous holes or pots, some of 

 which will hold fifteen or twenty gallons, excavated, as we know 

 they are at the present day, by the whirling of pebbles set in mo- 

 tion by a running stream, I infer that the stone must have lain in 

 the bed of a river which was subject to periodical fluctuations. 

 These pots, which bear a striking resemblance to those now found 

 in neighboring rivers, particularly in the Youghiogheny, were the 

 objects of curiosity to the people of the neighborhood for years ; 

 but the tracks, though often noticed, were thought to be compar- 

 atively unimportant, as they were presumed to have been made 

 by dogs, bears, wolves, wild turkeys, or other common animals. 



* All these tracks are depressions. 



