CHAPTER VI 



ECONOMICAL GEOLOGY. 



It is undoubtedly contemplated, that in the presentation of a 

 final report upon our geology, prominence shall be given to the 

 economical materials furnished by the earth's crust, embracing 

 an explanation of the principles concerned in searching for 

 them, plain practical rules of procedure, the best methods of 

 extracting, purifying and preparing them, and the uses to which 

 they may be applied. 



In the preceding descriptions of our formations, 'I have, in 

 many cases, made allusion to the uses to which the various 

 rocks and mineral products of the Lower Peninsula seem to be 

 well adapted; and as a general statement, I do not deem it 

 best, to do anything more than this in the present report. In 

 v regard to the leading mineral interests of the Lower Peninsula, 

 however, it may be expected that I should furnish, even in a 

 report of progress, a greater amount of data for the practical 

 guidance of those interested. For the purpose of presenting a 

 view of the variety of our mineral resources, I subjoin the 

 following table: 



CLASSIFIED LIST of Products of the Economic Geology of 

 the State of Michigan, and of subjects connected with their 

 description. 



