Geology and Natural History. 79 



graphic problems, one of which concerns the geological horizon 

 of the manganese deposits. h. s. w, 



3. Summary Report on the operations of the Geological /Sur- 

 vey of Canada for the year 1900 ; by George M. Dawsox, 

 Deputy and Director. Pp. 1-203. Ottawa, 1901. — This last 

 report of the late director, issued after his death, exhibits the 

 customary energy and progress of the Survey in developing the 

 geological resources of the Dominion. 



The commercial value of mica and molybdenite has led to their 

 special examination by experts. The mica (phlogopite) of Que- 

 bec and Ontario is of special value for electrical purposes ; but 

 the most satisfactory market is shown to be the United States 

 and not Great Britain. Molybdenite samples subjected to criti- 

 cal test show that cobbing and hand-picking may be carried on 

 with the ordinary ores profitably, but when the ore is of low 

 grade, rolling, screening and jigging are not economically suc- 

 cessful. 



Salt is reported from the " Medina formation" in a well near 

 St. Gregoire, Beauce Co., Quebec. 



The Crows Nest coal field is estimated to contain 22 billion 

 tons of possibly workable coal. The coal is of Cretaceous age, 

 and has excellent coking qualities with small percentage of ash. 

 A similar Cretaceous coal area has been discovered between the 

 55th and 57th parallels of latitude in British Columbia; and 

 anthracite has been found in the region of the head waters of the 

 Skeena and Stikine Rivers. The fuel near Forty Mile Creek on 

 the Yukon is Tertiary lignite, but samples of anthracite are 

 reported from a locality west of Lake Marsh. 



Study of the formations of the Brockville map-sheet (Ontario) 

 has revealed the fact that fossils referred to in earlier reports as 

 obtained from beds of Potsdam age, are found in what are 

 known as transition beds between the sandstone and the lime- 

 stone. The best specimens were obtained "from weathered sur- 

 faces of a siliceous limestone which represents the base of the 

 Calciferous formation." 



Investigations in the Cambro-Silurian slate region of York and 

 Carleton Counties, New Brunswick, have developed the fact that 

 the fossiliferous Silurian rocks overlie discordantly the Cambro- 

 Silurian slates; and Cambrian fossils have been found in black 

 shales near Benton, Carlton Co., belonging apparently to the 

 lower series. Nevertheless a satisfactory solution of the difficult 

 stratigraphical problem is not yet reached. 



The Arisaig formations have received special study with the 

 result of their reduction 'to four divisions, to which the names 

 Stonehouse, Moydart, McAdam and Arisaig formations are 

 applied. h. s. w. 



4. A revision of the genera and species of Canadian Paleozoic 

 Corals — the MadreporaHa aporosa and the Madreporariarugosa ; 

 by Law t rexce M. Lambe. Geological Survey of Canada. Con- 

 tributions to Canadian Paleontology, Vol. IV, Part II, pp. 97-197, 



