ABSTRACT OF PROCEEDINGS, ERIK, 
Mr. Harper opened a discussion on the relationships of 
the Narrabeen and Hawkesbury beds, with special reference 
to an apparent unconformity exposed recently at the 
foundations excavated for the Avon Dam. 
The subject was spoken to by Mr. H. C. Andrews, Judge 
Docker, Dr. W. R. Browne, Dr. L. A. Cotton, Messrs. 
T. L. Willan and H. G. Raggatt, and the Chairman. Mr. 
Harper then replied. 
Monthly Meeting, 18th September, 1922. 
Professor Sir Edgeworth David in the Chair. 
Sixteen members and seven visitors were present. 
EXHIBITS: 
1. By Mr. Halligan—Pebbles from Lake Eyre region 
showing a varnish-like polish, 
2. By Mr. L. L.Waterhouse—Suite of specimens illustrat- 
ing the geology of King and Flinder’s Islands, Bass Straits. 
3. By Mr. Smith—(a) Beryl from Torrington; (b) Mona- 
zite from Cow Fiat, Deepwater. 
A lantern lecture was given by Professor David on the 
Geological History of Bass Straits. 
Monthly Meeting, 16th October, 1922. 
Professor Sir Edgeworth David in the Chair. 
Fourteen members and four visitors were present. 
EXHIBITS: 
1. By Mr. Waterhouse—(a) An unknown mineral, 
believed to be a pseudomorph, possibly after gypsum, and 
containing carbonates of Mn, Zn, Fe, Ca, and Ba, with a 
coating of native Ou; (b) a collection of four aboriginal 
tomahawks from Galston, near Hornsby. 
2. By Mr. Dun—An example of cone-in-cone structure 
(the property of Professor Taylor) from 200 miles north of 
