34 The American Geologist. J"'^'- ^ ''*''*• 
In addition, there is clastic mica, and the reHc of feldspars 
in places. Granitic rocks would furnish detritus in propor- 
tions nearest to those found in the series. No sediments alone 
would do it, except perhaps a series essentially like the one 
made from it ; and igneous rocks more basic than the granite- 
rhyolyte series would not furnish the requisite amount of 
quartz . 
In view of the evidence, it may be stated very tentatively 
that the pre-Meguma land mass probably consisted of granitic 
igneous rocks ; with some sediments, of which we have definite 
trace in the quartzyte conglomerates and perhaps in some slate 
conglomerates in the center of the province. 
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