402 PROCEEDINGS OF SECTION C. 



land Desert Sandstone, the researches of Mr. Gibb Maitland, 

 Assistant Government Geologist of Queensland, have demon- 

 strated that in the Mackay District there are extensive sheets of 

 sanidine-trachyte and agglomerates referable to the horizon of the 

 Desert Sandstone. 



As regards Tertiary volcanic rocks, Mr. Jack distinguishes at least 

 two seriec — an older and a newer. 'J'he series were erupted at 

 a time when the Desert Sandstone had undergone very little 

 denudation, and the newer when the Desert Sandstone had been 

 considerably eroded, as the newer lavas are found filling valleys in 

 the Desert Sandstone. 



These two series might be homotaxiai with the older volcanic 

 and newer volcanic rocks of the Victorian Survey, the former of 

 which must now be regarded, in part at all events, as Eocene and 

 the latter as Pliocene. 



Evidence of the most recent volcanic action in Queensland is 

 obsei-vable at the Endeavour River, north of Cooktown, where 

 volcanic necks and traces of craters are well preserved w^ith their 

 radiating sheets of lava. It is doubtful, however, whether even 

 these are newer than Pliocene. 



Hot springs, such as those of the Einasleigh River, are the only 

 evidence to show that Queensland still possesses volcanic poten- 

 tialities. The temperature of the Einasleigh Springs, as described 

 by Mr. Jack, approaches that of boiling point.* 



In Victoria the recent researches of Professor R. Tate and Mr. 

 J. Dennant, F.C.S., have facilitated the correlations of the Tertiary 

 volcanic rocks of Victoria with those of New South Wales. In 

 their paperf on correlation of the Marine Tertiaries of Australia 

 these authors have shown that nearly all the so-called Miocene 

 beds, composed chiefly of hard polyzoal limestones, must new be 

 referred to the Eocene Period, and the age of their associated 

 volcanic rocks must therefore be altered correspondingly, and the 

 rocks originally classed as "older volcanic" (Miocene) by the 

 Victorian Survey must be nOAV considered Eocene, and may be 

 homotaxiai with the Older Tertiary basalts of New England, 

 which are there associated with a contemporaneous flora considered 

 by Baron Ettingshausen to be Eocene. 



The remainder of the Victorian volcanic rocks newer than 

 Eocene are probably either Pliocene or Post-Pliocene. Those 

 which are of Pliocene age are probably approximately homotaxiai 

 with the widely-developed Pliocene lavas of New South Wales, 

 which at Gulgong are associated with a contemporaneous flora of 

 Pliocene age, in the opinion of Baron F. von Mlielier. Remains of 

 M eiolania, consisting of a small horn core, the greater part cf a 

 caudal vertebra, and two portions of two of the annular segments 



* Report of thr second meeting of the Austrdlasian Association lor the Adviincenn.iit of 



Science, 1890, vol. ii., p. 458. 



t Transacuons. Royal Society of South Australia, 1893, p.p. 203-22(). 



