224 T. S. Hunt on the Chemical and Mineralogical 
small beds, often with quartz, and occasionally with a little py-: 
roxene. ‘These basic aluminous minerals form, however, but an 
insignificant part of the mass of strata. This system is further 
remarkable for the small amount of ferruginous matter diffused 
through the strata, from which the greater part of the iron seems 
to have been removed, and accumulated in the form of immense 
beds of hematite and magnetic iron. Beds of pure crystalline 
plumbago also characterize this series, and are generally found ° 
with the limestones. These are here developed to an extent un- 
known in more recent formations; and are associated with beds 
of crystalline apatite, which sometimes attain a thickness of 
several feet. e serpentines of this series, so far as yet studied 
in Canada, are generally pale colored, and contain an unusu 
amount of water, a small proportion of oxyd of iron, and nei- 
ther chrome nor nickel, both of the latter being almost always 
present in the serpentines of the third series. 
The second, abrador series is characterized, as alread 
remarked, by the predominance of great beds of anorthosite, 
composed chiefly of triclinic feldspars, which vary in compost- 
tion from anorthite to andesine. These feldspars sometimes form 
mountain masses, almost without any admixture, but at other 
times include portions of pyroxene, the latter passing into hyper- 
sthene. Beds of nearly pure pyroxenite are met with in this 
series, and others which ca 
and they will probably be found, when further studied, to 0: 
a complete lithological series. These rocks have been observed 
cording to Emmons, they form the highest summits. Sage 
In the third series, which we have referred to the Lower Silu- 
micaceous, OLeM 
passing into micaceous schist, a common variety of which cone 
tains disseminated a large quantity of chloritoid. Argillites 
