586 president's address. 



The general dip of the Upper Devonian rocks near the Avon 

 River is S.E. at a low angle. AVhere, however, the rocks have 

 been locally folded, the axes of folding strike N.N.W. and S.S.E. 

 AtMt. Tambo the series is 1500 feet thick and has been folded 

 on a N.W. and S.E. axis. 



In the western area of Victoria Carboniferous (l) rocks attain a 

 thickness of over 2000 feet in the Grampians, and are chiefly 

 sandstones and sandy flags. A syncline, having a N.N.W. and 

 S.S.E. trend, is developed between the Grampians and Mount 

 Dundas, both of which are composed of these rocks. No evidence 

 has been obtained to show the upward limit in geological time for 

 the folding of the Carboniferous rocks of Victoria. 



(2) In New South Wales the sandstones and conglomerates of 

 the Clyde Mountain, near Braidwood (the former crowded with 

 innumerable casts of Rhynchonella pleurodon), and the marine 

 sandstones and rubbly red grits, in which Lepiclodendron australe 

 was found by Mr. W. P. Hammond and Mr. W. Anderson"^ at 

 Back Creek, near Major's Creek, may be referred to some horizon 

 in the Carboniferous provisionally, though it is quite possible that 

 they may be hereafter referred to some part of Carbonifero- 

 Devonian, or Upper Devonian, time. At Back Creek the dip is 

 S. 20° E. at 8° and at the Clyde Mountain it is E. 20° S. at 45°. 



It is not yet known whether these rocks are older or newer than 

 the Gympie Series (Carboniferous. — T.W.E.D.) of Queensland. 

 The presence oi Rhynchondla pleurodon is inconclusive, as at Mt. 

 Lambie it is associated with Spirifera disjicncta, and in the Star 

 Series of Queensland it occurs in strata newer than the Gympie. 



Until lately the Gympie Series had not been identified in New 

 South Wales, though traced from Queensland to the borders of 

 New South Wales between Ballendean and Bonshaw^ I have, 

 however, lately come to the conclusion that the whole of the 

 Palaeozoic sedimentary rocks of the Vegetable Creek district, 

 provisionally classed by me as Upper Silurian or Siluro-Devonian, 



* Annual Report Department of Mines, pp. 121-125. By authority. 

 Sydney, 1892. 



