89O STUDIES FOR STUDENTS 



In explaining an intricately faulted area on the basis of 

 deformation by folding only, it is also the tendency to make 

 geological formations much more heterogeneous than they 

 really are, until at last they have so many different phases that 

 all distinguishing petrographic differences are lost. With the 

 broader interpretation petrography will take a higher place in 

 geological mapping. 



It is the intention of the writer in another place to present 

 with the aid of maps and photographs some concrete examples 

 of areas within the belt of crystalline schists where deformation 

 has been accomplished in part by folding and in part by a 



system of faults. 



William Herbert Hobbs. 

 Madison, Wis. 

 September 1, 1902. 



