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LIBRARY 



THE OTTAWA NATURALIST. 



Vol. XII. OTTAWA, FEBRUARY, 1899. No. 11. 



ON THE ORIGIN OF SOME ARCH^AN 

 CONGLOMERATES.* 



By Alfred Ernest Barlow. 



The writer, in collaboration with Dr. Frank D. Adams, is at 

 present engaged in a geological examination of an area covering 

 nearly 3500 square miles, including portions of the Counties of 

 Hastings, Haliburton and Renfrew in the Province of Ontario; 

 Canada. 



These investigations and studies are believed to have a 

 special importance because of their bearing upon some of the 

 most intricate questions of xA.rchtean geology, among the more 

 important of which may be mentioned the character and rela- 

 tions of the so-called Grenville and Hastings Series, and their 

 possible equivalency with other Archaean groups previously 

 described from more remote districts. In addition, it was believed 

 much information was desirable and could be secured in regard 

 to the origin, relative age and composition of the gneisses and 

 granites usually classified as Laurentian. 



The work has been in progress for several seasons, but 

 is now rapidly approaching completion, and it is confidently 

 expected that another season will be sufficient to enable a report 

 of an approximately final character to be written. 



Several communications, either separately or conjointly, 

 have already appeared regarding the progress of this work, 

 indicaing not only the main conclusions likely to be reached, but 

 also presenting some points of immediate and special scientific 

 interest. It is in pursuance of this policy that the following is 



*Read by title at the Geological Society of America, New York, Dec. 28th, 1S98. 

 Read before the Logan Club, Ottawa, January 21st, 1899. Publ'shed by permission 

 of the Director of the Geological Survey of Canada. 





