GEOLOGY AND PALEONTOLOGY 1 7 
tallized, so that nearly all traces of sedimentary origin 
are lost. 
No. 2 (29) shows a fine granular groundmass, largely of quartz but 
with some feldspar, scattered through which, without parallelism, are 
abundant scales of biotite. Magnetite in fine grains and opaque car¬ 
bonaceous matter are also present. The quartz grains retain their 
clastic character fairly distinctly. 
No. 3 (30) would be called from the thin section alone a granitoid 
gneiss. It is a hypidiomorphic-granular aggregate of quartz grains 
and sharply bounded, zoned crystals of plagioclase feldspar, the zones 
giving extinctions corresponding to acid labradorite at the centre and 
oligoclase at the boundaries. The feldspars are perfectly fresh, and in 
the centre free from inclusions, but their outer zones are filled with 
clastic grains which have been surrounded during the later growth of 
the crystals. Many of them have the appearance of clastic grains sec¬ 
ondarily enlarged during the recrystallization of the rock, but this is not 
always evident. The interstices between the feldspars, which make 
up perhaps half of the rock, are filled partly with the granular quartz, 
partly with plates of biotite and grains of garnet and zoisite. No 
parallel structure is visible in the slide. 
No. 4 (31) is similar to the last but appears more gneissoid, owing 
to the parallelism of the biotite plates. It also has more quartz and 
some muscovite. 
The field evidence is conclusive as to the sedimentary 
origin of these rocks, and they offer a beautiful illustration 
of the formation of gneiss from a feldspathic sandstone. 
The rocks of the last two localities probably belong to 
the Vancouver Series described below, page 42. 
The celebrated garnet locality at the mouth of the Sti- 
kine River is about ten miles north of Wrangell and is 
probably in this same series. It was not visited, but it is 
said to be very extensive. 
At Farragut Bay, Frederick Sound, the rock is a rather 
uniform schistose serpentine, very thin-bedded, much 
jointed, and in nearly vertical position. Quartz veins are 
abundant. In thin section (13) this rock was found to be 
a nearly pure fibrous serpentine, containing shattered frag- 
