62 



Geology of Canada, this group is divided into the Sillerj and Levis forma- 

 tions. The Sillery, consisting of a vast deposit of sandstones and slates, has, 

 as yet, furnished only two species of fossils, — a small Lingula^ too imper- 

 fectly preserved to be determined, and Obolella p-etiosa. The L(5vis for- 

 mation holds a large, intej-esting and well marked fauna, which persistently 

 maintains the same combination of types, and consequently exhibits the 

 same aspect along a chain of exposures extending from Newfoundland to 

 Vermont, a distance of nearly 1000 miles. The same rocks have been 

 traced through Vermont into New York, and will, perhaps, yet be found 

 to continue on to the Gulf of Mexico. The formation, however, in its 

 extension into the United States has, as yet, furnished only a few frag- 

 mentary fossils. The localities in Canada, where organic remains abound, 

 are of limited extent, and widely separated from each other, although they 

 all occur in the same line of outcrops. The perfect identity of the species 

 which are common to exposures so far apart as are Cow Head in New- 

 foundland, and Point L^vis and Phillipsburgh in Canada, is truly wonder- 

 ful ; while the rock specimens, whether of slate or limestone, are often abso- 

 lutely indistinguishable from each other by any lithological characters. 

 From this formation we have 219 described species, distributed as follows : 



Zoophyta 1 species. 



Graptolitidffi 53 " 



Brachiopoda 28 " 



Lamellibranchiata 2 " 



Gasteropoda 42 " 



Cephalopoda : 20 " 



Crustacea "(S " 



219 



In the above, I have not' included any of the Newfoundland fossils 

 except those which occur in the slates and limestones at Cow Head. The 

 rocks of this locality are precisely of the same age as those of Point Ldvis ; 

 but the other fossiliferous exposures, such as those at Portland Creek, 

 Table Head, Point Rich, and Pistolct Bay, hold a somewhat different, 

 although closely related, fauna. They may well be placed in the Quebec 

 group, but not in the Levis formation. The Quebec group, in fact, con- 

 sists of several formations differing from each other lithologically and 

 palaeontologically, and yet forming a connected series. In the Ldvis for- 

 mation, the following genera of trilobites occur : 



Arlonellns 2 species. 



Balbyurus 12 " 



Bathyurelliis G " 



Conocephalites 1 " 



Dikelocephalus 1' " 



Menoceplialus 3 " 



Lojranellus 1 " 



