128 G. D. OSBOKNE. 



It is, with a slight modification, Section No. Ill, given 

 by Professor Sir Edgeworth David in the portfolio accom- 

 anying that monumental work, "The Geology of the Hunter 

 River Coal Measures. " (u) This section forms the basis of 

 the work, and the writer is fortunate in having such a 

 section already prepared on which to make this study. 



The section starts in the neighbourhood of Morna Point 

 and is drawn crossing successively the Kuttung series and 

 no less than seven coal basins of the Permo-Oarboniferous 

 system. The modification made in the present paper con- 

 cerns the portion near the western end, viz., from E to A 

 on Professor David's section. 



As an alternative the section is stopped near the Hunter 

 River at the fault, which, throwing S 18° W, displaces the 

 Greta coal about 500 feet, and is then shifted to the east 

 side of the Cranky Corner Basin, described by Walkom. (12 > 

 This procedure is thought to be permissible, and cannot 

 involve much error or affect the general conclusions. 



This modified section was used in order to eliminate the 

 possibility of error involved in reconstructing the folds 

 across the tract D to C on Professor David's section which 

 includes the disturbed and fractured zone near the Hunter 

 River where a possible displacement of 5000 feet is indi- 

 cated. 



A section was drawn linking up the maps of Prof. David 

 and Dr. Walkom, thus obtaining some idea of the relation 

 of the coal measures of Cranky Corner Basin to those of 

 the Branxton Basin. It is very evident from the work of 

 Walkom in the Glendon Brook district that the Lower 

 Marine series thinned out quickly to the north, their thick- 

 ness at Cranky Corner being only 900 feet. An advantage 

 of the slightly altered section is that it includes the Cranky 

 Corner Basin, which was formed as a result of local cross- 

 warping, it being undoubted that the Permo-Oarboniferous 



