316 
THE PETROLOGY OF THE GRANITIC ee aor CAPE 
WILLOUGHBY, KANGAROO ISLAND:—PA 
By C. E. Tinizy, B.Sc., ATIC. 
Demonstrator in Geology and Mineralogy, University of 
Sydney. Deas-Thomson Scholar in Geology, 1919. 
(Communicated by Professor Walter Howchin.) 
[Read September 11, 1919.] 
PLATES XXX. AND XXXI. anp 2 Mars. 
CONTENTS. 
I. Introduction. 
II. Generd] Description. 
III. Characters of the Rock Types— 
(a) The Main Granite. 
(b) The Minor Intrusions. 
IV. The Pink Aplite and its Products of Pneumatolysis. 
V. The Nature and Composition of the White Pegmatite. 
I. The Relations of the Roc Types. 
VII. General Discussion. 
I. INTRODUCTION. 
E granite headland of Cape _ Willoughby 
: om 
attention, and e previous literature dealing with this 
area brief reference. only is made to the intrusion. This 
literature is: 
(a. ) Head, W.: Trans. Roy. Soc. S. Austr., vol. 
xxvil. 1903, pp. 80-83. 
(".) Wade, k. Bull. No. 4, Geol. Surv. S. Austr., 
and 21. 
s In addition the writer "ed «gains s certain quartz 
tourmaline Mn from this a 
$ PR A ce ALIE 
ns, LE Soe. 8. Austr., 1919, p. 156. 
x Be P 
