PLATE XVIII. 



Fig. 1. 



Showing the jointed structure of Clay Marl II. Dobb's clay bank, near 



Collingswood. 



Fig. 2. 

 Clay bank at Budd's brickyard, Camden, showing the massive character of 

 the Clay Marl I, and the drainage hole in the foreground into the Raritan 

 sand. The vertical and horizontal marks on the clay are the impressions 

 made by the spades in digging. 



