172 W. R. BROWNE. — 
THE GEOLOGY OF THE COOMA DISTRICT, N.S.W. 
ParRT I. 
By W. R. BROWNE, B.Sc., 
Assistant Lecturer and Demonstrator in Geology in the University 
of Sydney. 
[Read before the Royal Society of N. S. Wales, July 1, 1914. ] 
I. Introductory. 
II. Stratigraphical and Descriptive. 
Summary, 
(a) The Metamorphic Series:—Schists and phyllites. 
Igneous gneisses—mottled, Cooma, blue, white and 
pink gneisses. Amphibolite. Pegmatites and quartz 
veins. 
(6) Ordovician. 
(c) Silurian. 
(d) Post-Silurian but Pre-Tertiary:—Quartz-porphyries. 
Berridale granite. Myalla Road Syenite. 
Geological age of the igneous intrusions. 
(e) Tertiary and Recent:—Olivine Basalt. Diatomaceous 
earth. Travertine. River Gravels, Aeolian deposits. 
III. Economic Geology:—Bushy Hill mines. Tripolite. Lime- 
stone. Barytes. 
IV. Age of the Metamorphic Series. 
V. Geological History up to Tertiary times. 
VI. Physiography:—Present topography. Stissmilch’s interpre- 
tation. Details of development of the river system. Age 
of the basalts. Origin of the lakes. 
