70 The Ottawa Naturalist. [June 



ON THE NEPHELINE ROCKS OF ICE RIVER, BRITISH 



COLUMBIA.! 



By Alfred Ernest Barlow, M.A., D.Sc. 



In the May number of the Geological Magazine a\)pQi\Ys an 

 article on a " Sodalite Syenite (Ditroite) from Ice River Valley, 

 Canadian Rocky Mountains" by Prof. T. G. Bonney, D.Sc, 

 LL. D., F.R.S., &c.^ In referring- to the work previously done on 

 rocks from this locality, Prof. Bonney was evidently ignorant of 

 the fact that the occurrence of an igneous complex at this place 

 was pointed out by the writer in an article read before the Royal 

 Society of Canada in May, 1900, an abstract of which appeared in 

 Science^ N.S., Vol. XI, No. 217, page 1022, At the time it was 

 intended by Dr. Dawson that the writer should pay a special visit 

 to this locality in order to study the relations of the various types 

 in the field, collecting sufficient and suitable material for further 

 study in the laboratory. Pressure of other work, however, has not 

 only prevented this, but also the publication of the details of some 

 of the interesting phenomena observed in the specimens already 

 available. In view of the publication of Prof. Bonney's interest- 

 ing paper, it is considered advisable to give immediate publication 

 to some of the general results of the detailed petrographical 

 examination of the rock specimens furnished to the writer by the 

 late Dr. G. M. Dawson, in February, 1900. These were collected 

 on August 13th, 1884 by Dr. Dawson, while engaged in a geolo- 

 gical reconnaissance of this portion of the Rocky Mountains, but 

 in the hurry necessarily attendant on such preliminary work, only 

 the morning of that day was devoted to the examinations of their 

 fields relations They were obtained from exposures along and 

 in the vicinity of the Ice river a branch of the Beaverfoot river 

 in British Columbia. The area covered by these rocks as outlined 

 by Dr. Dawson on the reconnaissance map of part of the Rocky 

 Mountains, published in 1886, comprises portions of the Otter- 

 tail, and Vermilion Ranges. The northwestern edge of the mass 



^Published by permission ot the Director of the Geolog^ical Survey of 

 Canada. 



2 Geol, Mag., N^w Series, Decade IV., Vol. IX., No. V., May, 1903, pp. 

 199-206. 



