302 THE MAKQUETTE IKON BEARING DISTIUCT. 



of feldspar enlargement in the Marquette district. The pure feklspathic 

 quartzites pass into those which are micaceous and chloritic, the mica and 

 chlorite having largely developed at the expense of the feldspar. These 

 micaceous and chloritic quartzites pass by iuterstratification or gradation 

 into the mica-schists and chloi'ite- schists. While in hand specimen these 

 schists appear to be completely crystalline, in thin section rounded grains 

 of quartz still show their fragmental character. The development of biotite 

 and chlorite, with the separation of secondary quartz from the feldspar, is 

 beautifully shown. 



Area west of Teal Lake. — Nortli and wcst of the west cud of Teal Lake, in 

 sees. 33, 34, and 35 (Atlas Sheets XXIV and XXVII), there are very numer- 

 ous and large exposures of the qnartzite for a distance of 2i miles. The 

 underlving rocks of the Archean here belong to the Kitchi formation, this 

 place being, in fact, its typical locality and here occurring nearly all of 

 its peculiar phases. At a number of localities the Ajibik qnartzite is found 

 in contact with or close to the Kitchi rocks. In some places at the contact 

 between the two there seems to be only a minor discordance, but a close 

 examination shows that nowhere do the two formations grade into each 

 other. On the other hand, there is always a perfectly sharp contact 

 between them, although Rominger describes the two formations as grading 

 into each other.^ This mistake is excusable, because the Kitchi formation 

 is here a tuff closely resembling- a true water-deposited conglomerate. 



Near the north-south quarter line of sec. 34, in a little valley between 

 the qnartzite on the south and the green schist on the north, a contact was 

 found between the two formations where the unconformable relations are 

 jierfectly clear. This contact has already been described on page 295. 



At another locality, west of the wagon road near the west line of sec- 

 34, the qnartzite lies on the south side of the green schist as a mere skin, 

 and here the same unconformable relations are seen as in the center of 

 the section. In one case the plicated qnartzite described (pp. 297-298) is 

 found wrapping around the east end and the north side of a small knob 

 of Kitchi schist. This occurrence is believed to be explained by a headland 



'The Marqnette iron region, by C. Rominger: Oeol. Surv. of Jlichigan, Vol. IV, Part I, 

 1878-1880, pp. 37-39. 



