Geological Survey oj Canada. 63 



The field-work of the present report belongs to the able assist- 

 ants whom the head of the Survey has gathered around him, and 

 for the selection of whom he merits all praise. Sir William 

 Logan himself was chiefly employed in arranging the chaotic 

 mass of specimens that had accumulated in the apartments of the 

 Survey, and in securing to Canadian science whatever benefits 

 could be obtained from the meeting of the American Association 

 in Montreal ; after which he managed to spend a few weeks in 

 unravelling the tanojed skein of those old Laurentian rocks to 

 which of late he has so much devoted himself. 



We are surprised that the arrangement of the Museum occu- 

 pies so small a place in this Report. It has involved an amount 

 of labour appreciable only by those who know the difficulty of 

 arranging large collections. In its present state, the Museum of 

 the Survey may, in its lucid and orderly arrangement, challenge 

 comparison with any similar collection ; and affords a systematic 

 exhibition of the geology and of the mineral resources of Canada, 

 which will be read with pleasure by thousands who derive little 

 benefit from printed reports. It would be well in some future 

 Report to give a description and a plan of the Museum, which 

 might also be printed separately as a guide to visitors. 



Mr. Murray was occupied with the Huronian formation of the 

 North shore of Georgian Bay, the equivalent of the Cambrian of 

 English geologists, and the chief seat of copper-mining in Canada. 

 His explorations had reference principally to the di*tribution of a 

 band of limestone, which was taken as a guide mark in tracing 

 out the relations of these crumpled and shattered formations. 

 This limestone has accordingly been traced over a consider- 

 able extent of ground, and, with the section which Mr. Murray 

 has made across the country, gives a view of the general arrange- 

 ment of those rocks which we did not previously possess, and 

 which will materially aid in tracing out the mineral deposits in 

 their continuation in new localities. The writer of this review 

 spent a day or two, two years since, in puzzling over the intricate 

 distribution of rocks and veins at the Bruce Mines, with the aid 

 of the previous reports on the district and would have been 

 thankful then to have had Mr. Murray's map and section for a 

 companion. The general section of the Huronian rocks given 

 by Mr. Murray will be of interest to the geologist, and ought to 

 be in the hands of every one who " prosoects " for mines on Lake 

 Huron. It is as follows in ascending order : — 



