251 



names several fossils, especially Trilobites, Bathyurus and Menoceplia- 

 lus, which are common to the outcrops A\ A^, A^ B\ B", and B'^ (strata 

 de la terre du Cure) and the outcrop A"-, but I did not find any ; it 

 may be that some boulders and pebbles of A^ or la Redoute Limestone, 

 are enclosed in the conglomerates of the different beds of the strata de 

 la terre du Cure. 



The outcrop A- is entirely distinct from the others. It is true that 

 La Redoute is almost entirely surrounded by small bands of Calcife- 

 rous Sandstone, that form as it were the frame of a small island, but 

 such accidents are not rare in much disturbed and dislocated coun- 

 tries, and it is not difficult to see that La Eedoute is independent of 

 all the other hills of Point Levi, forming a conspicuous landmark, 

 which can be seen from all the environs of Quebec, and having a 

 north and south or meridian direction, in common with the whole of 

 the Green Mountain system, which put an end to the Taconic deposits, 

 while the other hills of Point Levi and Quebec run north-east and 

 south-west. The strata de la terre du Cure do not include, I think, all 

 the Calciferous Sandstone, as it is developed in Vermont and Phillips- 

 burgh ; the lower part, or white limestone of Phillipsburgh shore, is 

 wanting here. 



Potsdam Sandstone. — I did not see any rocks in the vicinity of 

 Quebec which I can refer to this capping group of the Taconic 

 system. 



Lingula-flags. — Not seen. 



Georgia Slates. — Not seen. 



St. Albans Group. — This lower group of the upper Taconic is well 

 developed on the south shore of the St. Lawrence, which it occupies 

 almost entirely, with the exception of one or two miles at Point Levi. 

 It extends far into the interior. Its thickness is at least three thousand 

 feet. The upper part is composed of green, brown, and black slates, 

 affected by numerous lines of cleavage, and can be seen very well 

 developed near the Gilmor Wharf, east of Point Levi, also on the road 

 from St. Joseph's church to Arlaka, at one mile from the church. I 

 consider the Redoute Limestone, or quarries of the Notary Guay, as 

 forming a lenticular mass inclosed in them, similar to one that I 

 observed at St. Albans. I did not find any fossils in the slates, except 

 the Chrondites, so common and characteristic of all the upper Taconic 

 slates. The Redoute Limestone presents a highly interesting fauna. 

 The strata are almost perpendicular, with a direction almost due north, 

 and a deviation to the east of 5° or 7°. The stratification is indistinct, 

 as it always is with lenticular masses. The limestone is gray, almost 

 white, very hard, sometimes oolitic, with little veins of chalcedony. Its 

 whole thickness cannot be less than eighty or one hundred feet. In 

 some of the strata fossil remains are numerous, but composed only of 



