432 Canadian Record of Science. 



are, as in Canada, sometimes of a violet, sometimes of a 

 brown colour, and again, sometimes, as white as limestone. 

 They are sometimes massive and sometimes banded or 

 foliated. Many of these hand-specimens can not be dis- 

 tinguished at all from the corresponding varieties of 

 Canadian anorthosites. 



They are intrusive rocks, and generally break through 

 the gneiss. But in Laerdal and Vos-Kirchspiel, according 

 to Kjerulf, these cut through beds of the primordial age, 

 and are therefore probably somewhat more recent than 

 the Canadian anorthosites, which are overlaid by strata 

 of Upper Cambrian age. An accurate comparison of the 

 rocks cannot yet be made since the Norwegian Occurrences 

 have not yet been investigated in detail. But so far as 

 we know at present, the rocks of the two ' countries are 

 identical. 



In southern Russia, near Kamenoi-Brod, in the govern- 

 ment of Kiew, and in many other places in the governments 

 of Volhynia, Podolien and Cherson, large areas of anortho- 

 site also occur. In these the labradorite predominates to 

 such an extent that all the other constituents almost dis- 

 appear. The rock occurs in some places in a coarsely 

 granular form, which is dark violet or almost black in 

 colour, and elsewhere as a porphyritic variety with large 

 dark-coloured individuals of plagioclase in a light grey 

 ground mass. These varieties are said to pass into one 

 another. Where the coarsely granular variety contains 

 pyroxene, it shows ophitic structure like that observed in 

 some parts of the Saguenay area. According to the 

 description of these rocks by several authors, 1 they must 

 resemble in a remarkable manner the anorthosites de- 

 scribed in this paper, and also exhibit the same varieties. 



i Schrauf , Studien an der Mineralspecies Labradorit. Sitzungsber Wiener Akad. 

 1869, p. 996.— W. Tarrasenko, Uber den Labradorfels von Kamenoi Brod. Abhandl. d, 

 Naturw. Ges. in Kiew. 1886, p. 1-28.— M. K. De Chroustchoff, Notes pour servir a l'etude 

 lithologique de la Volhynia. Bull. Soc. Mim France, IX., p. 251 (we,itere Literatur- 

 angaben enthaltend). >. * . 



