The Gramtes. Light polarized, nicols crossed, and magnification 35 diame- 
ters in each case. 
Fig. 1 is the youngest of the Precambrian intrusive granites; the Storm 
King granite. The feldspars are microperthite, microcline-microperthite, soda- 
bearing orthoclase and very subordinate alkalic plagioclase. The ferromag- 
nesian mineral is hornbende; and a very sparingly distributed but still fairly 
constant and somewhat unusual accessory is allanite. Quartz is fairly 
abundant. 
Fig. 2 represents the Canada Hill type granite. This granite is intrusive 
into granitized Pochuck-Grenville, northeast of Lake Mombasha and about two 
and one-half miles south of Monroe.. A pinkish, moderately coarse granite 
carrying about 30% quartz, 40% microcline, subordinate orthoclase, and occa- 
sional small scattered areas of quartz and orthoclase in graphic intergrowth. 
Fig. 3 represents a marginal syntectic. This occurs at Round pond, about 
one and one-half miles southwest of Monroe. It is related to the granite 
of fig. 2 (Canada Hill type), and is essentially a mixed type. The speckly 
and veined areas are heavily sericitized, veined and altered portions of earlier 
Pochuck-Grenville, incompletely absorbed in the Canada Hill type magma. 
Fig. 4 is the extreme end-phase product of the Pochuck magma; the acid 
differentiate, following the magnetite, and in its purer phases forming por- 
tions of the walls of the ore bodies (see plates 2 and 3, fig. 4). Much more 
extensively distributed than usually supposed, and involved with the Pochuck- 
Grenville, so that the feldspars are always plagioclase, ranging from oligoclase 
to andesine, usually sericitized, altered and more or less attacked. Referred 
by the writer to Pochuck time and called the Pochuck gramite. 
Much of the granitization of the Pochuck-Grenville is due to this granite. 
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