690 THE JOURNAL OF GEOLOGY. 



of the point where it terminates on Brooks' map. It becomes 

 steadily narrower, and as it does not appear at the Kingston and 

 Kloman exposures on the west side of the river, there can be 

 little doubt that it gradually dies out, and that the jasper wedge 

 finally merges into the main body of specular jasper (Fig. 1). 



Therefore, the facts to be explained appear to be these : A 

 quartzite tongue branches in the south from the main mass of 

 similar quartzite, and after continuing substantially parallel with 

 it for a long distance, finally tapers to a point in the north in a 



Fig. 5. — Elevation showing part of a quartzite "pocket" in the interior of the Jasper 

 Wedge. The black bands are specular hematite ; the uncolored are red Jasper. 

 The locality is about 100 feet northwest of the Thompson Pit. About one- 

 twelfth of the natural scale. 



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 the mass of specular jas- 

 per, 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. And between the jasper wedge and the quartzite 

 tongue extensive faulting has taken place. 



These facts point towards if they do not demonstrate the 

 identity in age of the two jaspers, and of the two quartzites, and 

 indicate that their present relations are due to faulting. 



Recurring now to the mechanical conditions which affected 

 the rocks during the folding, we have seen that the material 



