Hi. ABSTRACT OF PROCEEDINGS. 



The lecture was illustrated with a large collection of 

 specimens, and with a series of lantern views from photo- 

 graphs by the lecturer. 



Monthly Meeting, 19th September, 1921. 

 Dr. O. Anderson in the Ohair. 

 Thirteen members and one visitor were present. 



exhibits: 



1. From the Mining Museum: (a) A specimen of cryso- 

 tile asbestos from West Australia enclosing a small angular 

 fragment of country rock, (b) On behalf of Mr. W. T. W. 

 Brown, a large crystal of pyrites from Charters Towers. 



2. From Mr. Waterhouse: Pebbles from Thirroul beach 

 exhibiting faulting and silicification along the fault-planes. 



3. By Dr. Walkom: (a) Rhacopteris from the Herberton 

 District, Queensland ; (b) Leaf- whorls of Phyllotheca from 

 the Dawson River, Queensland; (c) Equisetites rotiferum 

 from Sugarloaf Mine, Oaky-Oooyar, Queensland ; (d) 

 Osmundites from Mount Playfair, Queensland. 



4. By. Prof. Ootton: (a) Trilobites (Dalmanites) from 

 the Flume Beds, Yass ; (b) What is probably a seed-pod of 

 Glossopteris from Newcastle. 



5. By Mr. Osborne: Photographs of a glaciated pave- 

 ment, and of a rubbing of the same, from the Kuttung series 

 in the Parish of Wolfingham, Maitland District. 



discussion : 

 The discussion on the geological age of the isolation of 

 Australia, adjourned from the July meeting was resumed. 



Prof. Ootton pointed out that the Tertiary was a period 

 of great diastrophism, which is still in progress. Australia 

 is being protected from the effects of this by a submarine 

 plateau, while the outlying island arcs have been experi- 

 encing folding ever since the Cretaceous. He considered 



