ABSTRACT OP PROCEEDINGS. XXIX. 



PAPER : 



The Chairman gave an account, illustrated by diagrams, 

 of some interesting geological features revealed during the 

 construction of the tunnel under Parramatta River between 

 Long Nose Point and Greenwich. The bed of the old 

 river is found to be at a depth of about 165 feet below 

 present high water mark, indicating a fall of about 10 feet 

 per mile between this point and the railway bridge at 

 Meadowbank. What appears to be a slight fault occurs in 

 the tunnel and has caused much trouble. The nature and 

 significance of the deposits revealed by trial bores at 

 intervals across the river were discussed. 



Messrs. Rankin, Halligan and Melville commented on 

 various points raised in the address. 



Monthly Meeting, lJfth July, 1920. 



Professor David in the Chair. 



Fifteen members and four visitors were present. 



It was resolved that the time of meeting be 7*45 p.m. in 

 future instead of 8 p.m. 



exhibits : 



1. From the Mining Museum: — (a) two meteorites, from 

 Warialda and Ban aba respectively, which with the Bingara 

 meteorite probably represent one fall ; (b) amygdales in 

 basalt, filled with opal, from Tintenbar opal field, Ballina. 



2. From the Australian Museum: — Hexagonal calcite 

 from Garabaldi Mine, near Lionsville. 



paper : 



Dr. Woolnough addressed the meeting on " The Coal 

 Fields of West Australia and the Associated Rocks," deal- 

 ing in interesting fashion with the stratigraphical, litho- 



