ABSTRACT 
PROCEEDINGS OF THE GEOLOGICAL SECTION. 
+<1- 
Monthly Meeting, 8th May, 1918. 
Mr. J. H. CARNE in the Chair. 
Ten members and three visitors were present. 
Mr. OaRNE and Dr. C. ANDERSON were proposed and 
elected as Chairman and Honorary Secretary respectively. 
| EXHIBITS: 
1. From the Mining Museum:—(a) Araucarioxylon; (b) 
Anglesite, Broken Hill, N.S.W.; (c) Banded Schist replaced 
by Rhodonite, Broken Hill; (d) Concretionary Marble; (e) 
Siliceous Sinter, Yellowstone Park, U.S.A. 
2. Mr. MATHIESON, Internal cast of Atrypa, Wellington 
Caves, N.S.W. 
3. Acting Professor CoTTon, on behalf of Mr. A. R. PIKE, 
exhibited a small diamond from the Gulgong district N.S.W. 
- The interesting feature about the occurrence of this dia- 
mond is that it was found in what appears to be a weathered 
dyke. If this is the case, it is the second record of the 
finding of a diamond in its matrix in New South Wales, the 
other being that previously recorded by Mr. PIKE from a 
dolerite dyke near Copeton, Inverell. 
4, Mr. W. R. BRownE:—Tuffaceous rock which had been 
observed to be intrusive into claystones in a railway cutt- 
ing about two and a half miles north of Bredbo, N.S.W. 
The evidence of intrusion consists of local hardening of the 
country rock and inclusions of the invaded formations in 
the igneous material. The name pyroclastic intrusives 
