306 T. G. TAYLOR AND D. MAWSON, 
THE GHOLOGY OF MITTAGONG. 
By T. GRIFFITH TAYLOR, Deas-Thomson Scholar in Geology 
and D. MAWSON, B.£., Junior Demonstrator in 
Chemistry, Sydney University. 
[Communicated by Prof. T. W. EpGEworTH Davi, B.A., 
F.G.S., F.R.S. | 
[With Plates XXV., XXVI.] 
[Read before the Royal Society of N. S. Wales, October 7, 1903. ] 
MITTAGONG on the main Southern Line is 77 miles from 
Sydney by rail, and about 30 miles from the coast. The 
town is over 2,000 feet above sea-level, and the railway 
rises gradually to Bowral, passing through the Gib tunnel 
at the foot of “‘The Gib.’’ The following paper is the out- 
come of several visits to Mittagong during the past year, 
and‘represents field survey with subsequent laboratory 
work at the University. The area dealt with consists 
chiefly in that portion of the country lying between “‘ The 
Gib’’ and Mount Jellore, and we have incorporated in our 
map a large amount of the field work done by J. B. Jaquet, 
during his survey of the iron ore deposits of the Mittagong 
district. The whole area, with Mittagong as a centre, 
comprises about 40 square miles. We propose to divide 
the paper into the following sections :— 
I. Introduction. 
II. Sedimentary Formations. 
Ill. Eruptive Rocks. 
IV. Petrological Descriptions. 
V. Chemico-Mineralogical Classification. 
VI. Age. 
VII. Summary. 
