588 president's address. 



Mt. Larabie Sories, which overlie the Sjnrifera disjunctu beds, are 

 lithologically much like the Gjmpie rocks of New England and 

 may perhaps hereafter have to be referred to that horizon. At 

 Barraba the Lepidodendroti australe beds appear to me to be 

 probably unconformable to the Gympie, as they are simply inclined 

 at moderate angles dipping off the much folded Gympie rocks. No 

 actual section, however, has been observed showing an unconform- 

 able junction. 



In the Stroud district, associated with a marine Carboniferous 

 fauna, Lepidodendron volkmannianum and L. veltheimianum and 

 Rhacopteris have been recorded.* 



These strata have been estimated by Mr. J. Mackenzie, F.G.S., 

 the Government Examiner of Coal-fields, to have a thickness of 

 about 10,000 feet, as shown on his unpublished sections. The 

 thickness was stated by me to be 11,300 feetf, but I have since 

 seen evidence which necessitates the removal of the upper 1309 

 feet from the top of that section and joining it to the Per mo- 

 Carboniferous System, which reduces the thickness of Carbonifer- 

 ous rocks in the Stroud District to that originally mentioned by 

 Mr. J. Mackenzie. The lower half of the section is partly marine 

 and partly freshwater, containing L. veltheimianum associated 

 with Rhacopteris and Calamites. The strata are chiefly arkose 

 sandstones and conglomerates, with thin beds of crinoidal lime- 

 stone oolitic in places. The upj)er half is partly volcanic and 

 partly freshwater, consisting of conglomerates, sandstones, and 

 cherty shales, containing Rhacopteris and Calamites in profusion 

 to the entire exclusion of Lepidodendron, and associated with 

 contemporaneous felsites and melaphyres and felsitic and basic 

 tuffs and purplish red shales. These Rhacopteris shales are the 

 last and newest of the Carboniferous rocks of New South Wales, 



* Geological and Palreontological Relations of the Coal and Plant-bearing 

 beds of Palaeozoic and Mesozoic Age in Eastern Australia and Tasmania, by 

 Ottokar Feistmantel, M.D., &c., Sydney. By authority. 1890. pp. 37, 

 139-141, 169. 



+ Report of the Australasian Association for the Advancement of Science, 

 Melbourne, 1890, p. 405. 



