ABSTRACT OF THE PROCEEDINGS 
CEOLOGICAL SECTION. 
a 
Ten meetings of the Section were held during the year. 
The average attendance was fourteen members and five 
visitors. 
Monthly Meeting, 20th March, 1922. 
Professor Sir Edgeworth David in the Chair. 
Twelve members and three visitors were present. 
Professor David was re-elected Chairman for the year, 
and Professor L. A. Cotton and Mr. W..R. Browne were 
elected joint Honorary Secretaries. 
EXHIBITS: 
1. By Mr. Harper—Maps and specimens illustrating the 
occurrence, near the proposed Avon Dam, of small inliers 
of Chocolate Shale in Hawkesbury Sandstone, indicating 
a slight unconformity between the Hawkesbury and 
Narrabeen stages, also specimens of a volcanic breccia 
occurring in places between the sandstone and the Narra- 
been Shales, and of tuffs containing fragments of the under- 
lying checolate shale. 
2. From the Mining Museum—(a) Specimens illustrating 
the occurrence and association of mica in the Macdonnell 
Ranges; (b) a portion of what appeared to be a mass of 
angular quartz fragments cemented by iron oxide, the 
whole assuming a globular shape; (c) a specimen of nau- 
mannite (selenide of silver) from the Lady Fanny Mine, 
Queensland. 
