280 fiREAT SERPEXTlNE-BP:Lt OF S'EW SOtJTlI WALES, VI., 



For a similar reason, we cannot profitably discuss the probable 

 ancient river-systems of (he regions east of the Serpentine Eelt, 

 a rough scheme for which is suggested by Dr. Taylor (46). It is 

 evident that great rearrangements have taken place: but the 

 investigation of these will require examination of the ancient 

 gravels and basalts around Keera, and extensive topographic 

 studies. It may be noted, however, that Mr. Cotton confirms 

 Dr. Taylor's hypothesis of a former connection of the Gwydir 

 River with the Macintyre to the north (37), and suggests that 

 the deflection of the Gwydir into its present westerly course at 

 Copeton, was due to the formation of the Keera Senkungsfeld. 

 The study of this very sparsely inhabited region will yield much 

 of interest physiographically. 



Acknowledgments. 



It would scarcely have been possible, in the short time avail- 

 able for this work, to have covered so large an area of sparsely 

 settled ground, were it not for the kind hospitality received by 

 the writer at the different Station-homesteads. He is, on this 

 account, greatly indebted to Mr. Capel, of Derra Derra, Miss 

 Capel, of Rooky Creek, the late Mr. King, of Eulowrie, Mrs. 

 Simpson, of Burindi, Mr. Geddes, of Hobden, Mr. Smith, of 

 Borah, Mr. Glover, of Mundowey, Mr. Sutherland, of Crow- 

 Mountain, and Mr. Schloesser, of the Gulf Creek Copper Mine. 

 For local information, he is indebted especially to Mr. Mack, of 

 Fallal, Mr. Porter, of Tamworth, Mr. McClelland, of Dinoga, and 

 to many others. The accounts and maps of the district given 

 by Stonier were his constant guide, and the admirable reports 

 of Stutchbury and Clarke, though not available while field-work 

 was in progress, have since been most useful. Much help has 

 been received from discussion of various points with Dr. Jensen, 

 Mr. Andrews, Mr. Cotton, and Mr. Dun, who has greatly aided by 

 palseontological determinations and references to literature. The 

 information accumulated by the other officers of the Geological 

 Survey, in some instances unpublished, has also been generously 

 placed at the writer's disposal. Throughout, the interest and 

 advice given by Professor David (at whose suggestion the work 



