117 



gully leading through Section 4168 intercepts that leading 

 through 4165 another of these folds, I am persuaded, exists 

 there ; for not only has the outcrop of the western quartz ite 

 band increased to the extent of from 3| to 4 chains over the 

 surface, but the dip of interbedded slate has decreased very 

 materially also ; the actual dip of which, about 50 feet below 

 the western quartzite band, is 31° east, thus showing within 

 a very short distance a lowering of the dip to the extent 17°. 



The movements causing the displacement of the original con- 

 formity of the strata, if I judge aright, have oj>erated in a line 

 nearly 5° west of mag. north, and east of south, for about one 

 quarter mile south in Section 4168. The same phenomenon 

 presented in the western band at junction of gullies in Section 

 4165 is repeated in the middle band on the southern side of 

 Section 4168, and, nearly in the same alignment south, the 

 eastern band has either been affected by the same disturbing 

 agency, or that some very decided movement of sea and land 

 intervened during the deposition of the eastern quartzite band ; 

 for, as before mentioned, it splits into two in Section 5671, and 

 passes into Tatala in that condition. In middle band at north- 

 west corner of Section 4170, a very fair rough building stone 

 could be procured. On western side of river, southern boundary 

 of Section 1560, dip of the slate 28° east, strike 5° east. As 

 represented in cliff on eastern side of the river in Section 

 1560, the western member of the eastern band there measures 

 from 50 to 60 feet in thickness. A little further west the 

 middle band is exposed in a fine section in the shape of a 

 miniature waterfall. The western band is not so well exposed 

 either on the north bank or in the bed of the river. However, 

 all three are conspicuously seen in regular order, as they 

 obliquely ascend the bold ascent on the southern side, finally 

 passing in their course to the south, forming a component part 

 of the bone structure of the Para hills. 



Remarks, North of Gross Section. — As the eastern band is 

 removed from its associates by an additional amount of clay- 

 slate, it also becomes thicker, and its lower portion, in Sections 

 4181 and 3322, almost assumes the character of true quartz. 

 Estimated thickness in Section 3322 : — Underlying quartzy 

 beds, 20 feet ; true quartzites, 30 feet ; dip, 40° east ; strike, 

 10° east. This quartzy character disappears as the band passes 

 through Sections 4350, 4353, and 3317, but reappears for a short 

 distance in Section 3316. The outcrop of the western band 

 exhibits a well-defined course through Section 2183, but it is 

 not so with the middle. In its course through the southern 

 portion of Section 2183 the western band has evidently 

 undergone a reversed anticlinal fold in a north and south 

 direction. At this point the band measures fully five chains 



