The ^- Awjot'' -Gneiss Area. — Liiijucr anil Hies. 247 
The shearing force wliich has produced the "aiigen'' has 
at times pulled off pieces from the ends of the larger lenses, 
thus giving rise to a train of feldspar lenticles extending in u 
direction parallel to the diameter of the lens, as shown in a 
section from No. 9. A good example of the formation of one 
of these smaller lens is shown in Plate IX, Fig. 5. 
The possibility of the "augen"' being true phenocrj^sts or 
segregations seems to be barred out by the absence of notice- 
able inclusions or secondary enlargements and by tiie presence 
of marked wavy extinction. Furthermore the "augen" are in 
nearl}^ every case surrounded b_y crushed rims. 
The fine-grained groundmass of the rock is composed of 
feldspar, quartz, biotite, muscovite, and in lesser amounts 
apatite, zircon, garnet, hornblende and magnetite. 
Feldsjxir is principally orthoclase, although plagioclase and 
microcline are present. Jt is usually gi-anular and shows, at 
times in a very marked manner, its derivation from larger 
individuals by crushing. Wavy extinction may be seen in 
most of the larger fragments. At times the microcline is 
evidentlv paramorphic after orthoclase. Evidence of decom- 
position is seen in all three of the varieties of feldspar, but 
has not proceeded far. 
Quar/z, in addition to the characteristics n)entioned before, 
shows abundant inclusions, the commonest of which are ex- 
ceedingly small and dust-like. They are sometimes arranged 
in strings normal to the schistosity. 
Biofite, having the usual appearance and of a brownish 
color, occurs plentifull}^ distributed through the rock, the 
shreds in general lying parallel to the schistosity. 
Muscovite is seen in lesser (juantity. 
Apatite and zircon, of the usual hal)it, occur plentifully as 
inclusions and some of the zircons show distiiu't pleochroism. 
Garnets^ witli more or less centrall}^ aggregated inclusions, 
characterize certain phases of the gneiss. 
Hornblende shreds were seen in a few sections. 
Maynetife grains occur sparingl}'. 
Schists. 
Schists from Nos. 28, 40 and 55, previously mentioned as 
being possibly metamorphic diabase dikes, appear in sections 
to vary somewhat in mineralogical composition and to consist 
