INTERESTING LOCALITIES OF AJIBIK QUARTZITE. 307 



Ajibik. If this be true, the three lower tbrniiitions must one by one die- 

 out to the west, eacli hig'her formation overUipping the one next lower. 



In thin section nearly all of the more altered phases of the Ajibik 

 quartzite, the Wewe slate, and the Mesnard quartzite ai-e found. Their 

 descriptions will not be here repeated. 



Eastern area. — Thc ucxt promiueut cxposures to the east are in the north- 

 ern part of sec. 6 and the western part of sec 5, T. 47 N., R. 25 W. (Atlas 

 Sheet XXXVII). The numerous ledges are very nearly pure quartzites 

 or ferruginous quartzites. None of them are changed into sericitic quartz- 

 schist or into cherty quartzite. The folding to which they have been 

 subjected has merely cracked the rocks, and along these cracks small, sec- 

 ondary quartz and iron oxide veins have formed. 



In the southeastern part of sec. 6 and the northern part of sec. 7 there 

 are large exposures of quartzites, which in most respects are similar to- 

 those east of Teal Lake. However, in the exposure just south of the 

 Carp River the quartzite is found to rest upon the Wewe slate and to^ 

 bear fragments of it. Apparently there is a very slight discordance 

 between them. The basal conglomerate is only a few feet in thickness, 

 and quickly passes up into a gray slate, Avhich bears several thin layers 

 of conglomerate. The interstratified slate and conglomerate in turn pass, 

 up into interlaminated slate and ferruginous quartzite, and this into the- 

 ordinary quartzite. So far as the structural evidence is concerned, the dis- 

 cordance is so slight as to have little significance. The phenomena could 

 be explained by the mud rising above the water for a short time, becoming 

 slightly compacted, and then, when buried beneath the water, furuish- 

 ino- fragments to the overlying formation. Such an occun-ence might be 

 extremely local. On the west side of this exposure the Wewe slate is found 

 to be faulted against the quartzite. This fault, or another running north- 

 west and southeast, has displaced the quartzite and a small \rAvt of the 

 underlying Wewe slate to the southward for a distance of about an eighth 

 of a mile, thus making the quartzites of the south side of the river stand 

 directly opposite large exposures of the Wewe slates of the north side of 

 the river. Apparently the river follows approximately the fault line. An 



