472 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [May 24, 



Figs. 19-23. — Plans and Sections illustrating the formation of 

 Escarpments. 



. Fio:. 19. 



FIff. 20. 



Fia-. 21. 



. .. 2 



Fiff. 22. 



Fii?. 23. 



