140 GEOLOGY MAITLAND-BRANXTON DISTRICT, 



his Presidential Address to the Royal Society of New South 

 Wales, thus : " At this time [Permo-Carboniferous], Eastern 

 Australia was probably, from New England to Townsville, isolated 

 from the portion lying further to the west, first by the Permo- 

 Carboniferous sea, and later by the lakes and swamps of that 

 period."* 



The following notes attempt to show the distribution of land 

 and sea in New South Wales in Permo-Carboniferous time, as 

 suggested bv the results obtained bv recent workers in the 

 North-eastern portion of the State, particularly Mr. J. E. Carne, 

 Professor Woolnough, and Mr. E. C. Andrews. 



The ideas put forward are by no means to be regarded as final 

 solutions of the problems, my chief reason for bringing them 

 forward here being that they may serve as something tangible, 

 to be modified as further information is brought to light. A 

 very important area in connection with this subject, and one 

 which is not well known at present, is that between the Manning 

 and Clarence Rivers. When the various Palaeozoic formations 

 in this area have been determined and mapped correctly, it is 

 probable that a number of modifications will have to be made in 

 the maps presented here. 



The results of recent work in Northern New England mostly 

 show that the extensive series of shales and slates there, are of 

 Permo-Carboniferous age,t and that the great granitic masses 

 have intruded the Lower Marine rocks, and are thus of late 

 Permo-Carboniferous or even Mesozoic age. These two results 

 point to the fact, that the greater part of what is now northern 

 New England, was under water in Lower Marine time. Other 



*Journ. Proc. Royal Soc. N. S. Wales, 1911, p.54. 

 t With regard to the slates in the neighbourhood of Tingha, two recent 

 workers do not agree. Mr. L. A. Cotton[8] regards them as being older 

 than Permo-Carboniferous, and similar to the Ordovician slates of Berridale 

 and Tallong. Mr. J. E. Came[7] puts them down as Permo-Carboniferous, 

 evidently on account of their lithologic similarity to occurrences further 

 north, in which he found Permo-Carboniferous fossils. Which of these 

 views may be correct, however, does not affect these notes to any great 

 extent, as it would only mean a small alteration in the position of the 

 western limit of the Lower Marine Sea. 



