INTERESTING LOCALITIES OF AJIBIK QUAliTZlTE. 303 



projecting S(imewli;it diag-oiially from the old .shore-line into the Ajihik sea, 

 thus forming a bay, and detrital material was deposited upon three sides 

 of the schist. When the two formations were upturned to the north and 

 eroded, the rocks assumed their present relations. 



A basal conglomerate grades up quickly into a regularly liedded, 

 southward-dipping, vitreous cjuartzite, Avhich shows nearly all of the phases 

 characteristic of the formation, including ordinary quartzite, ferruginous 

 quartzite, veined cherty qviartzite, quartz-rock, and chloritic quartzite. At 

 one place, at the quarry just west of the Carp River, is a fine-grained 

 conglomerate G or 8 inches thick, which holds very numerous fragments of 

 bright-red jasper. These were at first thought to have been derived from 

 the Negaunee formation of the Lower Marquette series, but probably they 

 came from the jasper veins in the Kitchi schist. 



West of the Carp River, in passing downward from the tojjmost 

 layers, where the quartzite is regularly bedded, one finds them becoming- 

 somewhat plicated, then more plicated, and finally closely plicated into a 

 series of minor cross folds, with axes plunging steeply to the south. In 

 places near the contact with the Kitchi formation this plication is so sharp 

 that reibungsbreccias have been produced. These are readily discrimi- 

 nated from the conglomerate, as no pebbles are contained in them other 

 than the quartzite pebbles, and because the brecciated phases grade into the 

 nonbrecciated phases along the strike. These brecciated rocks have been 

 cemented by secondary quartz, and by a large amount of oxide of iron, 

 so that they have a strongly ferruginous appearance. Because of their 

 ferruginous and brecciated character they have been thought by some 

 geologists to lie unconformably below the ordinary, regularly bedded 

 quartzite of other parts of the formation. This locality gives, therefore, an 

 excellent illustration of the rapid chaiige from areas where dynamic eflfects 

 are small to those where they are profound. It is to be noticed that the 

 dynamic effects are greatest at or near the contact with the underlying- 

 Kitchi schist. This contact plane was apparently one of weakness, and 

 therefore near it the major readjustments in the folding- took place. 



In thin section the conglomerate is found to have a wide variety of 

 pebbles, derived from the Kitchi formation. The quartz pebbles in no case 



