32 



SOIL PHYSICS AND MANAGEMENT 



It shows very little or no assorting action, although in some cases 

 the finer material may be washed out by water and deposited at the 

 base, thus leaving the coarser material higher up on the slope, while 



FIG. 22. Rock disintegration and formation of talus slope. More advanced stage. Mount 

 Sneffels, Colo. (Merrill.) 



(From Elements of Geology, Copyright 1911. by Eliot Blackwelder and Marian II. Barrows. 

 American Book Company, Publishers) 



Fio. 23. The side of a ravine near Crawfordsvillc, Indiana. The more rapid creep of 

 surface material has caused the trees to lean down hill. 



in other cases the coarser material may roll down the slope to a 

 greater distance, leaving the finer at the top. This process of weatb- 

 ering and downward movement of material will finally transform 

 ihe vertical cliff into a steep slope which will represent the angle 



