704 ME. J. E. MAER AISD DE. H. A. KECHOLSON 



the top of which rests a thickness of four inches of dark-grey, rather 

 ferruginous shales, with Monograptus turriculatus, Barr., and Rastri- 

 tes distans, Lapw., the former abundant and the latter rare. This 

 bed is seen on both sides of the stream. Above it one foot two 

 inches of pale shale separate it from another greyish-black band, four 

 inches thick, with : — 



Monograptus turriculatus, Barr. j Rastrites distans, Lapw. 

 Hisingeri, Barr. \ 



One foot six inches of pale shale intervenes between this and a 

 third black band, also four inches thick, in which we saw no M. turri- 

 culatus, but Rastrites distans was procured therefrom. 



These two upper zones are well seen at the top of a buttress of 

 rock on the left bank of the stream, and also higher up, to the east 

 of the waterfall, fourteen feet of pale shale ensue, and then a con- 

 cretionary grey bed about three inches thick, in which are no fossils, 

 is met with, forming the extreme summit of the cliff over which 

 the water falls at the head of the second ravine. This band may be 

 traced along the lateral cliff on the right bank of the stream, and 

 below the waterfall, and the ascending section followed from it. 

 The beds below it are inaccessible on this side, until near the bottom 

 of the dip where the banded rock already noticed occurs. Above the 

 concretioDary band we find in this cliff: — Green beds with fine 

 shaly bands, many of them stained pink, and in some of which 

 Graptolites are seen, but are poorly preserved, seventeen feet. 



This shaly bed, five inches thick, and stained pink, crowded with 

 Monograptus turriculatus, Barr., contains also: — 



Monograptus rectus ? | Eetiolites obesus, Lapw. 



A total thickness of 61 feet 4 inches has been measured between 

 the top of the zone of Rastrites maximus and this point, and we refer 

 these beds to the zone of Monograptus turriculatus. 



Ba 2. Above the waterfall, the stream runs through a shallow 

 valley, with exposures on each bank, but mainly on the left one. 

 Above the uppermost ^^trr^cw?ai^ts-band, we get thirteen feet of 

 green beds with fine shaly bands, at the top of which there is reason 

 to suppose the existence of a fault. 



A thin blue-black band, sometimes stained pink, is next met with, 

 and this yielded : — 



Monograptus pandus, Lapw. I Cyrtograptus ? spiralis, Gein. 

 griestonensis, Nicol. \ 



This band is much baked by a dyke, and fossils are difficult to 

 extract. It is two or three inches thick. 



Two or three feet of pale shale lie between this Graptolitic shale 

 and a felsite sheet breaking along the bedding and having a thickness 

 of about twenty feet, and above it are twelve feet of ordinary pale 

 shales somewhat baked ; the next band seen is very fine, grey, gritty 

 shale three inches thick, one bedding-plane of which is covered with 



