INTERESTING LOCALITIES OF AJIBIK QUAKTZITE. 311 



sec. 35 to the west part of sec. 32, T. 47 N., R. 26 W. (Atlas Sheets XXXII 

 and XXXV). 



Hauging on the west face of the great ledges in the NW. ^ sec. 35 

 is a coai'se conglomerate. This conglomerate jiasses np into the pure 

 vitreous quartzite. The Palmer formation is here a white sericite-schist, 

 cut by granite veins, brecciated, and cemented with coarse vein cpiartz, 

 chertv cpiartz, and ferruginous chert or jasper. All of these materials 

 are abundantly found in the conglomerate, and that they are derived 

 from the luiderlying formation can not be doubted. Farther west along 

 the contact between the Palmer gneiss and the Ajibik formation, in the 

 northeast part of sec. 34 is a great bluff of conglomerate, containing huge 

 bowlders of the white sericitic quartz-schist and chert, and also irregular 

 masses of jasper. A short distance to the south are found huge ledges 

 of the Palmer gneiss. This conglomerate appears clearly to be the liasal 

 conglomerate of the Ajibik quartzite. However, it is not positivel}' certain 

 that the conglomerate in sec. 35 may not be the Goodrich quartzite resting 

 upon the Basement Complex, as a consequence of the removal of the 

 Lower Marquette series in the erosion interval between Lower and I'pper 

 Marquette time. 



Near the line between sees. 32 and 33 a conglomerate again occurs, 

 which grades up into quartzite. South and a little west of the Piatt mine, 

 in sec. 32, is found a great conglomerate near the base of the formation, 

 which has been described by Wadsworth. This conglomerate occurs in a 

 precipitous sovith ward -facing bluff, and is a mass of well -rounded pebbles 

 and bowlders cemented by a sparse matrix. About 50 steps south of the 

 conglomerate is a dense, nearly massive, green rock, which is cut through 

 and through by granite veins. In the vicinity other varieties of the Palmer 

 gneiss occur. In the conglomerate the predominant pebbles and bowlders 

 are of rocks identical in character with those found in the Palmer formation 

 just to the south. In the conglomerate there are also quartz pebbles, and 

 its upper parts alternate with layers which approach jasper. In passing to 

 higher horizons the jasper layers become more and more prevalent, until 

 they are predominant. In the conglomerate are no undoubted jasper 

 pebbles, but there are roundish areas of jasper or chert which appear to 

 be secondary concentrations. 



