BY G. D. OSBORNE. 19/ 



EXPLANATION OF MAP (PLATE XXVI.). 



The map (Plate xsvi.) requires some remarks. On account of the imprac- 

 ticability of indicating on the legend the characters of all the units shown, a 

 supplementary key has been prepared, which is given in Text-fig. 6. The map is 

 entirely original, except for the following details: The boundaries of the alluvium 

 round about Seaham have been taken from Professor David's Map of the Hunter 

 Eiver Coal Measures, as well as the junction-line between the Kuttung Series 



CO 



C/3 



GLAClf\L 



I'l iV 



A A ri A A A 

 A A /i A A 



A A A A A ft 



V" V V V V V 



V V V V V V 



■/////////. "^r:: 



VOLCANIC ^^_ 



STAGE 



<> Sn <^ >.v <> V 



4- + 4- -I- 



PERMO-CARBONIFEROUS 



MAIN GLACIAL 



DELLENITE AND TOSCANITE 



LOWER PORTION" OP GLACIAL STAGE 

 COMPRISING TUFFS, &C. 



riTE AND TOSCANITE 

 ilLlIORE type) 



■E QUARTZ KERATOPHYRE 



BASAL 

 STAGE 





o o o o 

 D o o o c 

 o o o o 





Zj— iZ— Zr 



HYPERSTHENE ANDESITE 



HORNBLENDE ANDESITE ( MARTIN'S 



CK. type) 



CONGLOMERATES AND TUFFS "WITH 

 PLANT FOSSILS 



BURINDI SERIES 



/fCi^V^?>-s. 





Text-fig. 6. Supplementary key to the Geological Map. (Plate xxvi.). 



and the Permo-Carboniferous System from Seaham to the south-west, which itself 

 is not intended to be absolutely accurate. The extent of the Carboniferous Series 

 in the Dunn's Creek district has been changed from what was shown previously, 

 but the base of the Permian Beds near Butterwick has again been obtained from 

 Prof. David's map. The band of dellenite running from The Gap on the Lime- 

 burner's Road south-south-west and the boundaries of alhnaum near Clarencetown 

 have been copied from Jaquet's map. 



On account of the writer ha"ving mapped different units from those surveyed 

 by Jaquet, no reproduction of any of the details (with the exception of the 

 allu"vium mentioned) of his Clarencetown map has been made. 



