216 INDEX TO THE STEATIGRAPHY OF NORTH AMERICA. 



C. H. C. E. 



BathyurUB saffordi X X 



Bathyurellus nitidus X 



Bathyurellus foriBosus X X 



Bathyurellus fraternus X 



Nileus affinis X X 



Illsenus tumidifrons X 



Illsenus arcuatus X 



Illasnus consobrinus X 



* HolometopuB angelini X X 



Lichas jukesii X X 



Cheirurus vulcanus X X ' 



Cheirurus mercurius X X 



Cheirurus prolificus (Chazy) X X 



* Amphion barrandei X 



Amphion Julius X 



In the above list those found at Cow Head are placed in the column C. H. and those whj.ch 

 occur in Canada East (as well as Cow Head) C. E. The seven species of graptolites, with 

 lAngula quehecensis, occur only in the black slates; all the others in the gray and white limestones. 

 The three species with an asterisk before them are found in the next group of strata below. 

 No one could compare the collections from Cow Head with those of Point Levis and Phillips- 

 burgh without some feeUng of astonishment that in localities nearly a thousand miles distant 

 from each other there should be such a perfect identity not only in the fossils but also in the 

 character of the rock. The specimens, if mixed together without their labels, could never be 

 separated. Only a small collection was made at Cow Head, and there can scarcely be a doubt 

 that further examination will bmng to hght a greater number of species common to the two 

 countries. 



This fauna, although upon the whole specifically distinct from the one next below, consists 

 of the same types of trilobites, with the exception of Baihyurus cordai and B. conicus, which are 

 Calciferous species, as is also the brachiopod Camei^eUa calcifera. There are two species, Amphion 

 sol, and Endymionia meeki, which are found in division N, in Newfoundland, and not ,at Cow 

 Head, but they occur in the limestones of Point Levis, which are of the same age as those of 

 Cow Head. There are thus five common species, instead of three, as would appear by the 

 above list. 



From Cow Head, Point Levis, St. Antoine, Stanbridge, Bedford, and Phillipsburgh we have 

 in all 219 described species. Of these, the 51 species of graptolites described by Prof. Hall, and 

 also Lingula quehecensis, L. irene, Oiolella desiderata, and Shumardia granulosa have been found 

 only in the slates and thin-bedded limestones interstratified in the slates. The other 162 species 

 occur in the white and gray conglomerate limestones. That the slates and these peculiar 

 limestones belong to the same group is- proved by their occurring together in widely separated 

 localities, although as yet we are unable to show that any of the species are common to both. 

 At Cow Head G. headi was found in a loose piece of gray limestone, but it is not quite certain 

 that the specimen belongs to the conglomerates. 



The evidence that the rocks at Cow Head in Newfoundland are of the same age as those of 

 the Levis formation in Canada East amounts to this: (1) They are precisely the same in litho- 

 logical characters and (2) out of the 34 species collected at Cow Head 23 are perfectly identical 

 with those collected at Point Levis, Bedford, Phillipsburgh, and other typical localities of the 

 formation. There is, however, in Newfoundland an important series of strata, consisting of aU 

 the divisions from I to inclusive, having a thickness of 2,061 feet, lying below the Levis 

 formation and above the Calciferous, which has not been recognized in Canada. It thus appears 

 that the Levis formation not only lies above the Calciferous but more than 2,000 feet above it. 

 Yet it holds a large number of trilobites of the Potsdam type and several species, such as Lingula 

 mantelli, CamereUa calcifera, Baihyurus cordai, B. conicus] and Asaphus canalis, which certainly 

 do occur in the Calciferous. 



In the foregoing general catalogue (ante, pp. 366-370) there are 62 species placed in division P. 

 But if we exclude from that division all the species except those collected at Cow Head, only 

 those on the list on page 375 properly belong to it. The others should be placed in division N. 



