KELATIONS OF THE NEGAUNEE FORMATIOK. 



335 



the deposition of tlie Negaunee forinatiou, before the Lshpeming formation 

 began to be deposited. The degree of folding and the amount of erosion 

 are different in different i)arts of the district. At most places the discordance 

 is not more than 0° ti> lo", l)ut locallv, as at the Goodrich mine (Atlas 





Fig. 21).— Hurizimtal plauofcoutact ot'Giinclricln|Uiirlzitf on iilkateil Neijauueo 

 j:i9i>iliti-. 



Sheet XXVI), the Goodrich quartzite cuts vertically across the plicated 

 jasper (figs. 20 and 21). In some places the erosion has cut so deep as 

 to have entirely removed the Negaunee formation, and in other j)laces the 



Fit). 21.— C 



'ross^ectioii of coutaet of Goi'ilricU 'iuartzito 

 ^ plicated Negaiinee jaspilite. 



formation has a very considerable thickness. It thus follows that the 

 contact line between the two formations is now at one horizon of the iron- 

 bearing formation and now at another, varying from tlie highest known 

 horizon of the formation to its lowest. 



