XXV111. ABSTRACT OF PROCEEDINGS. 



3. Mr. W. T. W. Brown :— Gahnite, Silver Hill Mine, 

 Broken Hill; olivenite, near Maranboy, N. Territory. 



Monthly Meeting, 9th July, 1919. 

 Professor David in the Chair. 

 Six members were present. 



exhibits: 



1. From the Mining Museum: — Polar magnetite from near 

 Gulf Oreek Mine, Barraba ; avagonite in basalt, Oudgen, 

 Tweed River; pegmatite with green felspar, Broken Hill; 

 massive fluorite, Tingha (Connor's Claim); banded gneiss 

 with layer of unaltered sediment, Broken Hill; chalcedony 

 with inclusions, Moree. 



2. Professor David: — Section of calcareous alga (?) bur- 

 rowed by annelids from Field River, near Hallett's Cove, 

 Adelaide. This is perhaps the oldest trace of animal life 

 yet found in Australia. It comes from the geological hori- 

 zon of the siliceous limestone (Proterozoic) below the 

 Brighton limestone, about 3000 feet below the Archado- 

 ■cyathinse limestone. 



3. Mr. C. A. Sussmilch : — Carboniferous brachiopod 

 (Stropliomeiia sp.) from the Barrington River, five miles 

 from Gloucester. 



Monthly Meeting, 13th August, 1919. 

 Professor David in the Chair. 

 Seven members were present. 



exhibits: 



1. Australian Museum: — Natrolite with apophyllite, 

 Ardglen. 



2. Judge Docker: — Crinoids from near Mount Buffalo, 

 Victoria. 



3. Mining Museum: — Specimens illustrating the form- 

 ation of calcareous tufa, Cowan, near Yass; chiastolite, 



