THE 



CANADIAN RECORD 



OF SCIENCE. 



vol. vi. october, 1894. no. 4. 



On the Norian or "Upper Laurentian" For- 

 mation of Canada. 1 



By Frank D. Adams, M.A.Sc, Ph.D. 



(Translated from the German by N. J. Giroux, Esq., C. E., of the 



Geological Survey of Canada.) 



TABLE OF CONTENTS. 



1. General statement concerning the geology of the Laurentian. 



2. The Morin anorthosite area. 



(a) Stratigraphical relations. 



(b) Mineralogical character. 



(c) Structure as compared with that of other similar areas. 



(d) The anorthosite bands in gneiss. 



(e) Summary of the results obtained in the Morin district. 



1 This paper appeared in the Neues Jahrbuch fur Miner alogie in 1893 (Beilage- 

 band VIII). As it presents a somewhat exhaustive treatment of a celebrated 

 series of Canadian rocks, it has been thought advisable to present a translation of 

 it to Canadian readers. Since the publication of the paper further investigation 

 has brought to light some few additional facts concerning these rocks, but it has 

 been thought best to present the paper exactly as it originally appeared, making 

 any necessary additions to it in the form of occasional foot notes. The editors 

 of the Record of Science are indebted to Mr. N. J. Giroux, C.E., of the Dominion 

 Geological Survey, for a literal translation of the paper. 



The original paper in German was accompanied by two excellent maps printed 

 in colours, from which the maps accompanying the present translation are taken. 

 Those particularly interested in the distribution of these Norian rocks are re- 

 ferred to the original maps, as in these the relative position of the several areas is 

 shown with greater clearness. 



Correction in Large Map.— Owing to a mistake on the part of the lith- 

 ographer, the Adirondack Archean area has been represented as Huronian. It 

 should have been represented as of Laurentian age, since, with the exception of 

 the Anorthosite, it consists of rocks of the Grenville series. 



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