AND THE REPORT ON THE GEOLOGY OF VERMONT. 117 



structure. I have already given an example of the folding' Avith fault of the Swanton 

 slates, which is seen just below the bridge of SAvanton Falls, the contorted slates being 

 cut also by small local and veiy limited faults (see "Sur les colonies dans les roches Ta- 

 coniciues des bords du lac Champlain," in Bulletin Soc. Geol. France, ix, 29, Paris, 1880). 

 I shall now give several other examples. 



At Parker's quarry, Georgia, near the top of the section, fig. 1, just above the main 

 range of Olenellus Thompsoni, in a sandy limestone with nodules of red iron, thei'e are 

 small contorted beds made by strong pressure, as represented by fig. 4 on Plate 13. 



At Ilighgate Falls, in the lenticular mass of limestone, there are numerous contorted 

 beds of brecciated limestone, as seen on Plate 13, fig. 5, in a distance of only fifteen or 

 forty feet and with a thickness of thirty or forty feet. The most remarkable of these con- 

 torted structures is seen on the left bank of the Fall, between two houses built on high 

 Avails, fig. 6. 



At Pointe Levis, the clifts show several folded and contorted strata containing a quan- 

 tity of shnple and compound graptolites. Fig. 7, on Plate 13, represents, near the rail- 

 road depot, just behind the Victoria hotel, the same folding observed farther east at the 

 turning of the road from the ferry to the church of IvTotre Dame. 



Tlte section at Cliarlehourg near Quebec. — At Charlebourg, on the road in ascending 

 from Charles river to the village,' Ave haA^e in the Quebec-city and Citadel-hill slates or 

 Swanton slates A^ery numerous and complicated folding Avith small local faults. The 

 slates are beautifully contorted; and behind the village at the Tresplat, several quarries 

 in the horizontal Trenton limestone have reached the slates, and I haA^e seen them con- 

 torted and dipping -45" east-east-south under the almost horizontal Black River and Tren- 

 ton limestone (see Plate 13, fig. 8). 



Letndslides at Moyitmorency and Indian Lorette Falls. — This section of the road to 

 Charlebourg shows that there is no great fault at Montmorency Falls, at Petit Euisseau 

 and at Indian Lorette, but only small local landslides. Denudation and erosion of the 

 slates have undermined the Trenton limestone above, and, little by little, the band of 

 almost horizontal Champlain system has been excavated, destroyed and washed aAvay, di- 

 minishing its breadth by one-half and even more in some places, only about one-third 

 and probably less of Avhat Avas originally deposited now remaining. 



The process of destruction, underneath the slaty base, has forced the Ti'enton lime- 

 stone and Utica slates coA'er to slide doAvn, as it is now seen at Lidian Loi'ette Falls, and 

 on the I'ight side of the chasm at Montmorency Falls, Avhere some large fragments or 

 blocks of Trenton limestone are seen suspended on the asperity of the quartzite. And 

 at special places, like the ravine in Y-shape, at the foot of Montmorency Falls, on the left, 

 the Trenton and Utica, coming above a gully or truncated trough betAveen the qnai-tzite 

 and the Taconic black slates, slid down, filling up a part of the chasm. It is a sort of 

 fault by land slips, A^ery limited, absolutely local and comparatiA'ely of recent occurrence. 

 At the contact of the Utica and Taconic slates (Quebec Citadel Hill slates), the strati- 



' The contorted slates are on tlie right side of the road, died feet of slates, but the section does not show that great 

 fig. 8, and also on the left. Between the two small faults thickness, the distance not being drawn to scale, for want 

 and the village of Charlebourg, there are at least eight huu- of space. 



