STRUCTURE OF EUBY HILL. 47 



in color, rather slaty or laminated in texture, and sandy to the touch. A 

 close examination, however, shows that it is quartzite. This cross-cut is run 

 some distance into the back lime, which has its usual habitus. The quartz- 

 ite is again laid bare on the third level of the Albion, which corresponds 

 with the Richmond eighth, in two westerly cross-cuts from the Albion shaft. 

 The quartzite has been faulted by a fissure near the winze which descends 

 from the Albion second, and is not visible along the southeasterly drift. 



On the ninth level of the Richmond (Plate-XlV.), which is run almost 

 entirely in back limestone, the quartzite, except near the shaft, is of the 

 same character as that which appears in the south cross-cut on the eighth. 

 Near the station, another fault is discovered. Again the question arises, 

 Can this fault be in any way connected with the others above it! It is 

 most likely a separate fault which here shows itself for the first time. 

 Southeast of the shaft, toward the compromise line, the quartzite retains 

 its normal character and apparently its normal thickness. 



On the ninth level the narrow belt of quartzite must join the main mass 

 somewhere between the north cross-cut from the water drift and the shaft. 

 What the position of this dismembered mass maybe on the 1,050-foot and 

 lower levels future developments alone will show. In descending, this belt of 

 quartzite widens until on the ninth level it reaches a width of over 80 feet in 

 places. On both its hanging and foot wall sides, but especially on its hang- 

 ing, it exhibits signs of considerable motion, and it is more or less mixed 

 up with limestone at the planes of contact, and occasionally contains frag- 

 ments of the latter rock even at a considerable distance from the limestone. 

 Its lamination seems to be due rather to the effect of movement under im- 

 mense pressure than to the manner of deposition. Where the quartzite is 

 found unbroken and of the normal character it shows no such indications 

 of stratification. 



Dip and strike of the thin quartzite. — The dip of the contacts of tliis belt of quartz- 

 ite is much greater in many places than that of the main mass, although its 

 irregularities are such that it is impossible to make an exact determination. 

 The average dip in the levels above the Richmond ninth is about 45°, but 

 in the lower levels it would correspond more nearly with that of the main 

 fissure. The course of this quartzite is very tortuous, as a reference to the 



