544 THE MARQUETTE IKON-BEAIJIXG DISTRICT, 



Avedge can not belong to the upper series unless there are two upper series. 

 The jasper of the wedge, also, is not a fragmental rock, and in it no con- 

 temporaneous fragmental material has been recognized except near the 

 lower and upper contacts. The jasper disappears a short distance south of 

 this section, the two quaitzites coming together. If this is a member of the 

 upper sei-ies, it must have been laid down at the same time that a rather 

 coarse fragmental rock was being deposited a few hundi-ed yards away. 

 It is hardh- conceivable that under these circumstances clastic material 

 should not have been mingled Avith it. 



AVliile the relations of the quartzite tongue are correctly represented 

 on Brooks's map, the vastly better surface exposures of the present day and 

 the laroe amount of exploration done by the Republic Compan}' enable its 

 position now to be fixed with much greater precision. 



Several diamond-drill holes north of the Thompson pit have shown 

 that the quartzite tongue extends 500 to 600 feet north of the point where 

 it terminates on Brooks's map, and becomes steadily narrower. As it does 

 not appear at the Kingston and Kloman exposures, on the west side of the 

 river, there is little doubt that it gradually dies out, and that the jasper 

 wedge finally merges into the main body of specular jasper. 



Therefore the facts to be explained appear to be these (PI. XXXIV, 

 fig. 2): A quartzite tongue branches in the south from a large mass of 

 similar quartzite, and after continuing parallel to it for a long distance 

 finally tapers to a point in the north in a mass of specular jasper. The 

 quartzite tongue includes between itself and the main quartzite mass an 

 exactly similar jasper tongue, which starts in the north from a mass of spec- 

 ular jasper and tapers to a point in the south in quartzite, the two tongues 

 interlocking. The quartzite in each case, in the tongue and in the main 

 mass, has similar and unusual relations (those marking a time-break) with 

 the jasper of the tongue and of the main mass. The identity of the two 

 jaspers and of the two quartzites must be taken as established, and the 

 explanation of the facts must be sought in faulting. 



In the horseshoe tm-n the material above the neutral surface yielded 

 to the compression in part by slipping along bedding planes. If for any 



