Xorian I R >tuya. 421 



On the North Shore of the Gulf of St. Lawrence. 



We know thai anorthosites occur, associated with 

 Laurentian gneisses, at many points of this coast, but we 



ssess little information concerning the extent and strati- 

 graphical relations of the several occurrences. 



Hind 1 and Cayley. 2 who ascended the Moisie River and 

 its arm. the Clearwater, met with a mass of this rock 

 which extends from the mouth of the Xorth East Paver 

 to a point four miles up the Clearwater. This is a dis- 

 tance of nearly twenty miles, after which the gneiss occurs 

 again. \Ve do not yet know how wide this area is. but 

 Hind ascertained that the Clearwater flows through a 

 gorge. 2,0( '. :-: deep, cut in the anorthosite. Details : 

 the structure and composition of the rock have not yet 

 been ascertained. 



\Vestward of the Moisie. anorthcsite was found in large 

 exposures at different places along the whole coast as far 

 as Pentecost River. Richardson undertook 

 survey of this region in the yea: The anorthosite. 



which here again presents many varieties in char 

 and appearance, was described by him as coloured bluish 



_:eenish and nearly identical with that of the Morin 

 area. Gneiss occurs, likewise, on thr .-:. and we have 

 no knowledge as to how far the anorthosite may extend 

 to the north. These occurrences are. however, of par- 

 ticular interest, because the anorthosite is here often 

 led." or foliated. The parallel structure is indicated 

 • _raius of mica, garnet, iron ore., hypersthene,. etc.: and 

 the apparent strike is on an average east by west, gener- 

 ally with a northerly dip varying from 10 c to 80°. The 

 general strike of the gneiss in this region is nearly north 

 and south, according to Richardson, who concludes from 



1 Hind. Explorations in the Interior of the Labrador Peninsula. Londo: 



-tions on the Supposed Glacial Drift in the Labrador Peninsula, etc.— Quart. 

 Jour. Geol. Soc.. Jan 



2 Cayley. Up the River iloisie.— Tr. Lit. ft Hist. Soc. of Quebec. 1S62. p. To. 

 s Richardson. Report of the Geological Survey of Canal.. 



