420 Canadian Record of Science. 



site of Chateau Eicher, as well as in that of St. Pauls Bay 

 and of New York. It is, however, probably of secondary 

 origin. 



(b) In Newfoundland. 



This occurrence was first mentioned by Jukes, 1 and was 

 later briefly described by Murray in his " Eeport of the 

 Geological Survey of Newfoundland, 1873," p. 335. The 

 anorthosite occurs, along with Laurentian gneisses, in the 

 region of the Indian Head, Cairn Mountain, and of the 

 Little Barachois Eiver at the south-west extremity of 

 the Island of Newfoundland. Its exact composition is 

 not yet known. On Murray's geological map of New- 

 foundland, the indicated area has a length of 60 miles ; 

 it is comparatively narrow, and is divided into two parts 

 by a tongue of Carboniferous rocks which partly cover it. 



The only hand-specimen of this rock which could be 

 obtained came from Cairn Mountain. It is rather coarsely 

 granular and exactly resembles many of the anorthosites 

 of Morin and the Saguenay, except that it is reddish in 

 colour while those from the latter places are dark blue 

 or grey. It consists almost exclusively of plagioclase; 

 under the microscope, as in the case of so many anortho- 

 sites, cataclastic structure in all stages is to be observed. 

 Some individuals have curved twinning lamelke others 

 are already bent and broken ; granular plagioclase is found 

 between them. This finely granulated material forms the 

 principal part of the rock, and in the hand-specimens the 

 larger cystal fragments are imbedded in it. The ordinary 

 inclusions in the plagioclase are very numerous but very 

 fine, and resemble a fog or mist, giving, as already men- 

 tioned, a reddish and not a dark blue colour to the rock. 

 Of other ingredients only a few grains of pale green 

 augite were found, often altered into a mixture of chlorite, 

 epidote, and pale green hornblende, with a few small 

 grains of iron ore. 



i Jukes, A General Report on the Geological Survey of Newfoundland, 1839-1840. 

 London, 1843. 



