372 



ciatecl with it, perhaps these particular strata should be more properly 

 referred to the base of the Calciferous, and they -would then correspond 

 to Division D. Most of the species are found in Divisions G and H, the 

 upper part of the formation in Newfoundland. Two of the species 

 {S. fibrosa and A. canaliis) range upwards into the Chazy, the former con- 

 tinuing to the Upper Silurian. The general aspect of the fauna is pecu- 

 liarly that of the Calciferous, the most striking features being the great 

 numbers of small Maclurce and species of Piloceras, the latter a genus 

 which seems to have culminated in this particular period. 



Divisions I, K, L, M. 



These four divisions consist of 235 feet of magnesian limestones at the 

 base, above which we have 84-i feet of light bluish grey limestones, mak- 

 ing in all a thickness of 1084 feet. Only thirty-seven species of fossils 

 have been collected in this series of beds ; and of these, nine species are 

 found in division H below, while ten of them pass upwards into Division N 

 next above. Three of the species (^Stromatopora compacta, Ortlioceras 

 AUumeftense and Asaphus cajialis^ occur in Canada, the first two in tl\e 

 Cliazy and Black River, and the last in the Calciferous and Chazy. The 

 following are closely alhed to Black River and Trenton species. 



Ctenodonta Angela, allied to, C. contracta, B. R. 



Siihulites Daphne, " " >S'. jjarvidus, B. R. 



Murcldsonia simulatrix, " " 31. gracdis, B. R. & Tr. 



" Cicelia, " " 31. perangulata, B. R. 



" sororcula, " " " " B. R. 



" Augusiina, '• " 31. belUcincta, Tr. 



Ortlioceras Jioesitans, " '^ 0. Big^hyi, B. R. 



The occurrence of great numbers of individuals of these species, in a sili- 

 cified condition, and weathered out in bold relief, gives to the slabs of 

 limestone an aspect so remarkably like that of the Avell-known specimens 

 from Pauquctte's Rajuds, that at first sight one might be well led to say, 

 this is surely the Black River limestone. But on careful comparison of 

 perfect specimens, it is seen that notwithstanding the resemblance, none of 

 the species are strictly identical. All present such differences that after 

 a study of collections from both localities, they can be separated if mixed 

 up together without their labels. Even 0. Allumettense, which I have 

 identified, differs by being much larger than any specimens that have been 

 seen in the original localities. 



If the succession were the same here as it is in Canada and New York, 

 we ought to have the Chazy formation represented in these four Divisions. 



