50 C GEOLOGICAL SURVEY OF CANADA. 



Orthis testudinaria, Dalman. Abundant. 



Orthis subquadrata, Hall. Many perfect and well-preserved specimens 

 of an unusually coarsely ribbed variety of this shell. 



Rliynchonella capax, Conrad. Several large and perfect examples. 



Murchisonia gracilis ? Hall. One small cast. 



Cyrtolites ornatus f Conrad. One imperfect cast. 



Ascoceras Newberryi, Billings. Two specimens. 



The collection made by Mr. Ells at this locality shows, first, that a 

 largo portion of the mass of Stony Mountain consists of limestones, 

 with clayey jiartings, which are identical, both in their lithological and 

 paloeontological characters, with the well-known rocks of the Hudson 

 Kiver or Cincinnati group of Southern Ohio and elsewhere; and, 

 secondly, that these Hudson Eiver rocks of Stony Mountain overlie, 

 immediately and conformably, the buff-coloured, fossiliferous and more 

 or less magnesian limestones of the Eed Eiver valley, which have 

 already been assumed to be the representatives of the upper part of the 

 Trenton limestone. 



At Stony Mountain Dr. Bell also made a small collection of fossils, 

 consisting of the following species. 



Orthis testudinaria, Dalman. 



Orthis subquadrata, Hall. 



Rliynchonella capax, Conrad. 



Cheirurus Icarus, Billings. One pygidium. 



Calymene Blumenbachii, Billings, as of Brongniart. An imperfect pygi- 

 dium. This is the common Calymene of the Trenton and Hudson 

 Eiver groups, identified by Billings and Dr. Nicholson with the 

 C. Blumenbachii of Europe. Mr. S. A. Miller, however, says that 

 the true C. Blumenbachii has not been found in North America, 

 and that the species mistaken for it is the C. senaria of Conrad, 

 which latter is a synonym of G. calliteles, Green. 



A few fossils' were collected by Dr. Bell at various places on the 

 Churchill and Nelson Eivers, which appear to be of newer age than 

 the Lower Silurian, but which are insufficient to indicate with much 

 probability the exact geological horizon of the rocks in which they 

 were found. The following are the localities at which these fossils 

 were collected, with notes on the species. 



