296 Professor Bonney — Specimens from the Canadian Rockies. 



weathering with a rather irregular, lumpy surface. Examination 

 under the microscope shows it to be a rather fine-grained limestone, 

 slightly discoloured (probably by a bituminous material which 

 may be also represented by a few scattered granules). The veins 

 and enclosures are a coarser calcite, especially the latter, in which 

 the grains are about as large as in ordinary crystalline limestones. 

 No organisms are recognizable. 



From Mount Noyes (10,000 feet), about 5 miles east of Mount 

 Howse, we have the following specimens: — (1) A dark limestone 

 (picked up on a glacier) resembling some British specimens from the 

 Carboniferous system, and containing a silicified coral like a Litho- 

 strotion. The fossil is not well preserved, but Mr. E. T. Newton, 

 F.E.S., who has kindly examined it, tells me he is almost certain it 

 belongs to the genus Diphjphyllum, which, as he remarks, leaves the 

 age uncertain, as it has been found in both the Carboniferous and 

 the Silurian. (2) A darkish limestone with damaged trilobites, 

 in regard to which Dr. H. Woodward kindly furnishes the note 

 appended to this paper.^ (3) The summit rock is an impure 

 limestone (Ca C O3, with traces of Mg O and a good deal of insoluble 

 residue), with some small irregularly rounded enclosures, which 

 may be either fragments or casts of bivalves, but on the whole 

 I incline to the view that the rock retains traces of organisms. It 

 has a general resemblance to later Paleeozoic limestones in Britain. 



From the Canyon of the Bear Creek, which runs between Mounts 

 Howse and Noyes, comes a dark limestone (Ca Mg C O3), with 

 nothing about it to suggest the possibility of ascertaining a date. 



Mount Murchison (11,100) lies roughly east of Mount Lyell, and 

 well to the east of the watershed between Bear Creek and the 

 Saskatchewan Kiver.^ The summit is a pisolitic limestone (Ca C Og 

 with a little MgCOg) ; oblately spheroidal bodies in diameter from 

 half an inch downwards, of a darkish grey colour, indicating on 

 weathered surfaces a concentric structure, being set in a light 

 yellowish or brownish matrix. The pisolites under the microscope 

 consist of a rather muddy limestone containing a few specks of 

 quartz or a silicate, also brown granules and possibly a very few 

 fragments of small organisms. They exhibit a rough concentric, but 

 no radial structure, and in one or two places something resembling 

 a minute branching suggests traces of Girvanella. In the matrix, 

 which is not very difierent, except that it consists of larger and 

 more translucent grains, we find granules (? bituminous), a few 

 quartz grains, one or two of which show a crystalline outline, 

 oolitic grains with traces of radial structure, often having small 

 fragments of an organism as a nucleus, and several bits of shell, 

 most of them probably bivalves, but one or two possibly Gasteropoda. 

 In one case the structure resembles that of an echinoderm ( ? crinoid). 



Mount Hector, which is about ten miles from the pass of that 

 name, and on the eastern, side of the watershed (being almost north 



' Professor Collie informs me that it was found " just above the bands of Cambrian 

 quartzite, the same as occurs on Mount Hector and elsewhere." 

 ^ It is some ten miles N.N.W. of Mount Noyes. 



