HO TEEN CA TAIOIN SS. 225 
connection with the terrane of crystalline schists underlying the Peno- 
kee series, and known as the Southern Complex. The first is the 
diverse petrographical character of these rocks and their probable 
igneous origin. The second is the author’s use of the term granite. 
These will appear from the following digest : 
The Southern Complex is considered to be Archean, and is desig- 
nated on the map as granite, granitoid-gneiss, schist and fine-grained 
gneiss. In the text these rocks are said to be exceedingly complex 
both as to their lithological character and structural relations, com- 
prising unmistakable eruptives, including diabases (considered post- 
Archean in age), syenites, gneissoid-granites, granites, and many dif- 
ferent varieties of gneisses and schists. The areas of granite and 
schist alternate with one another, and are associated in such a man- 
ner as to indicate that the latter are metamorphosed forms of the 
granites. Instances of the alteration of feldspar to quartz and biotite 
are described, and the changing of a feldspar-rock into a mica-schist. 
The “Western granite” area consists of ‘‘granite and gneissoid gran- 
ite,” the latter varying in structure from almost granitic to “extremely 
contorted and quite finely foliated.” The mineral composition is 
nearly constant throughout this area and is that of granite. The ‘‘ West- 
”? 
ern green schists” are distinct from the rocks just noted. In different 
parts of the area they have very different characters. Most of them are 
finely schistose gneisses of various kinds, some appear to be highly 
altered basic eruptives. The “Central granite” has a large area and is 
both granitic and gneissoid. ‘The rocks here included vary greatly 
in their chemical composition, running from granites to gabbros. The 
three chief types of rocks are the granites, the syenites, and the gab- 
bros: =-Concerning, the “Eastern granite” the author says: “The 
phase here included run from typical syenites to typical quartzose 
granite.” 
The diabases occurring in the Southern Complex are considered 
to be contemporaneous and in some cases continuous with those form- 
ing dikes in the Penokee series. 
The author states that “the kinds of rocks mentioned in the South- 
r» 
ern Complex are not necessarily all which may there exist, 
a fraction of the exposures were visited. The most important fact 
since only 
developed by the study of this complex is the apparent gradual change 
between the massive rocks and the schistose ones, and the conclusion 
that the latter are metamorphosed eruptive rocks. 
