XV i ABSTRACT OF PROCEEDINGS. 



Mr. H. A. Longnian, F.L.S., exhibited a single large 

 fossil vertebra recently found near Dalby by ^Ir. Thos. 

 Jack, who donated it to the Queensland Museum. He 

 identified it as one of the caudals of Megalama prisca, an 

 ally of the monitor lizards or ' ' goannas ' ' of to-day, but which 

 was about 18 feet in length. 



Mr. W. H. Bryan. M.Sc, exhibited a fossil specimen 

 of a .species of the class Equisetales which was found in the 

 Brisbane tuff at Morjiingside by ^liss Moxon. 



Prof. II. C. Richards, D.Sc, read a paper entitled, "An 

 T'nusual Rhyolite from the Blackall Range." The rhyolite, 

 which is at least 1,000 feet thick, forms the Bon Accord 

 Falls in Skene's Creek and the Narrows in the Obi Obi 

 Creek. Chemically the rock is very remarkable, and a 

 comparison v>itli other analyses shows that it is one of the 

 most acid lavas 3-et recorded. Its high silica content of 

 over 85 per cent., together with its low alumina content of 

 about 5| per cent., show its remarkable chemical characters. 

 It i.s believed that heated waters containing silica, carbonic 

 acid gas, &c., have been responsible for the alteration of the 

 original rhyolite, and that these waters are of magmatic 

 origin, and acted during the last stages of cooling down of 

 the lava. The term deuteric has been given to these 

 reactions by Sederholm, and they are believed to be much 

 more common than hitherto understood. 



^Messrs. W. H. Bryan, E. 11. Gurney, F. Bennett, and 

 Dr. E. O. Marks took part in the subsequent discussion. 



Abstract of Proceedings, 24th November, 1922. 



The Ordinary ^lonthly ^^leeting of the Royal Society 

 of Queensland was held in conjunction wath that of the 

 Ro.yal Geographical Societ}' of Australasia (Queensland) 

 in the Geology Lecture Theatre of the University at 8 p.m, 

 on Friday, 24th November, 1922. 



His Excellency Sir Matthew Nathan, P.C., G.C.M.G., 

 presided. 



The minutes of the last meeting were taken as read. 



Sir Matthew Nathan and Professor H. J. Priestley 

 ref:^rred apprceintivoly to the f^ciontific work of Professor 



