492 GREAT SERPENTINE BELT OF NEW SOUTH WALES, i., 



The geological map is mainly original, but owes something to 

 the following sources: — 



From the unpublished charts in the Office of the Geological Sur- 

 vey, have been copied part of the granite boundary east of Bin- 

 gara, part of the boundary of the Jurassic sandstone near Wari- 

 alda, part of the boundaries of the basalt near Rocky Creek, and 

 part also of the boundaries of serpentine and limestone east of 

 Manilla. The distribution of the basalt and Tertiary gravels, near 

 Bingara, is taken from the reports of Messrs. Stonier and Ander- 

 son. While the volcanic geology of the Nandewar Mountains has 

 been taken direct from the maps published by Dr. JensenO); the 

 boundaries of the Carboniferous and Permo- Carboniferous in that 

 region have been somewhat modified, but were laid down, with his 

 approval, after a discussion, with him, of the knowledge recently 

 gained. 



The detailed account of the geology and topography of this area 

 has been withheld for the present, in the hope of obtaining further 

 information. The petrographical portion of the work was carried 

 out in the Sedgwick Museum, Cambridge, by permission of Pro- 

 fessor Hughes, to whom the author is indebted for many kind- 

 nesses. Thanks also are due to Professor Bonney, for his helpful 

 interest in the work, etc., to Dr. Arber, for palaeobotanical infor- 

 mation, and to Dr. Flett, and Dr. Hinde for checking the author's 

 deductions from certain microscope slides. To Mr. Harker, the 

 writer is indebted for invaluable help and advice throughout, and, 

 in particular, for ideas as to the relation of igneous action to tec- 

 tonic conditions, suggested by a most stimulating series of lectures 

 on "Igneous Action in Britain." The chemical analyses were made 

 in the Mineralogical Laboratory at Cambridge, under the helpful 

 guidance of Dr. Hutchinson. 



Chapter i. 



General Geology and Topography. 



The area to be described lies north and south of Tamworth, an 



agricultural centre on the main line from Sydney to Brisbane, 280 



miles from the former. For the greater part, it forms the slopes 



