Miles and 
kilometres. 
25 
the course of the River L’Achigan. Immedi- 
ately to the south of the road, at a point two 
miles from New Glasgow, anorthosite has been 
quarried for paving sets at two places. The 
first of these is 160 yards from the road. Here 
the anorthosite is seen to possess a distinct 
foliation marked by little lines of the iron 
magnesia constituents and garnet. 
Four fine-grained, black dykes of diabase of 
much later date, the largest of which is four 
feet wide, here cut the anorthosite transverse to 
its foliation. The iron magnesia constituents 
in the anorthosite are hornblende and augite. 
The former mineral, as has been already men- 
tioned, is found in the Morin anorthosite only 
in a few places near the border of the mass. 
The rock is very fresh and in addition to being 
granulated has probably been recrystallized, 
in part at least, under the intense movement to 
which it has been subjected. 
Six hundred yards from the road is a quarry 
from which over half a million paving sets were 
taken for use along the harbour front in Mon- 
treal. The anorthosite here is pale grey in 
colour and weathers white. Occasional dashes 
of dark bisilicates can be seen as well as occas- 
ional rennants of larger phenocrysts or individ- 
uals which have escaped complete granulation. 
Like the anorthosite last mentioned, it has 
probably undergone a considerable amount of 
recrystallization. The iron-magnesia constit- 
uents present are hornblende, augite and 
hypersthene. 
New Glasgow—Alt. 240 ft. (73-1 m.) To 
the west of New Glasgow excellent exposures 
of the white foliated anorthosite are seen along 
the line of the Canadian Northern railway. 
The fine waterfall on the outskirts of the village 
is formed by L’Achigan river cascading down 
over a great exposure of this rock. A micro- 
photograph of a thin section of this rock between 
crossed nicols is shown in the accompanying 
plate (p. 23). 
