Surface Tension and Denudation. 59 



EXPLANATION OF PLATE XVIL 



Fig 1 . At Coburg, East of Pentridge. The surface crust is 

 18 inches thick, then comes softer material — a 

 mixture of coarse sand and clay. There is no 

 evidence of falling water or of splash. 



Fig. 2. The head of a canyon at the same locality. The 

 harder bands project. No water falls over. 



Fig. 3. Also at Coburg. The surface crust is 4 inches thick. 



Fig. 4. At Heidelberg. There is no evidence of a splash. 



Fig. 5. At Coburg. The surface crust is 2 feet thick. There 

 is a much softer band 18 inches wide near the 

 bottom. 



