Vol. 58. ] PLUTONIC COMPLEX OF CENTRAL ANGLESEY. 679 
found their way along planes of schistosity, giving rise to banded 
gneisses. 
Fig. 2 (p. 668) is a generalized section across the central complex, 
showing the relations of the granite to the gneisses and schists. 
LV. Summary oF REsvtts. 
(1) The central complex of Anglesey was originally composed of 
diorite, felsite, and granite. 
(2) The diorite has been modified into an elliptical dome of dark 
gneiss, namely, into simple gneisses by pressure, and into complex 
gneisses by pressure plus granitic intrusion. 
(3) The intrusion of the granite into the diorite has often pro- 
duced fusion at the contact, sometimes with the generation of 
biotite in the diorite. 
(4) The diorite and dark gneiss form an insular mass surrounded 
by granite. 
(5) The felsite has been modified into quartzose and micaceous 
schists and gneisses, by pressure, and into banded gneisses by the 
addition of granitic intrusions. 
(6) The quartz-felsites of the area area part of the granitic 
magma. 
(7) Both diorite and felsite were modified into gneisses and schists 
prior to the intrusion of the granite and quartz-felsite, which are 
not foliated. 
