SOUDAN FORMATION. 175 



than those which are outUiied ou the accompanying maps will be found, 

 but it can be confidently stated that they will in all cases be small and 

 presmnably of very sliglit importance. 



TOPOGRAPHY. 



The amount of the iron formation in the district is relatively so small 

 that it can scarcely be said to have had any great effect upon the general 

 topography. In those areas where it is best developed it does influence 

 the topography very materially. As the result of the resistant character 

 of the jasper, which is the predominant rock in the formation, strongly 

 marked hills persist where it is joresent in large quantity. Of these, the 

 most striking are Lee and Tower hills, Jasper or Chester Peak, the hill 

 forming the prominent northeast point of Stuntz Bay, and the hills in sec. 

 7, T. 62 N., R 14 W., and in sec. 4, T. 61 N., E. 14 W.; also the prominent 

 ridge extending through sec. 2.5, T. 63 N., R 12 W., and sec. 30, T. 63 N., 

 R. 11 W. In the various belts containing the iron formation the jasper 

 very commonly occupies minor prominences, the low ground between being 

 occupied presumably by the associated greenstones and sediments. 



STRUCTURE. 



The iron-beai'ing Soudan formation being the oldest sedimentary 

 formation in the district has been subjected to all of the orogenic move- 

 ments which have occurred in the district since its deposition. Since there 

 were several of these movements, and since the forces producing them 

 were very intense, the formation has been most intricately folded. It is 

 indeed difficult to describe or represent the intricacy of the folding which 

 it exhibits upon nearly every exposure of any size. 



On a large scale the formation has been folded into anticlines and 

 synclines, and its structure is now shown to a certain extent by the topog- 

 raphy. Thus, for example, the prominent hills — Lee, Tower, and Soudan — 

 are great anticlines with minor synclines and anticlines superimposed upon 

 them, whereas Jasper Peak is situated at the end of a syncline, and on its 

 western and southern sides shows very prettily the jasper folded into a 

 series of rolls pitching a little to the east of north. It is also highly prob- 

 able that some of the east- west trending belts of the iron formation are to 

 be considered as synclines of jasper infolded in the older greenstone. 

 Upon the more prominent anticlines and synclines numerous minor folds 



