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Q 



GQ 





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ti 



''''r-'--;: w 



Kuttung Series — some 10,000 feet of acid. 

 felsitic tuffs, fluvioglacial conglomerates,, 

 tillites with rarely striated pebbles, and. 

 seasonally banded contorted ' varve' rocks,, 

 andesitic and rhyolitic flows, and intrusive 

 rocks represented by felsitic and other sills. 



This series was originally termed b}^ 

 one of us (W. N. B.) the 'Kocky Creek 

 Series ', but has since been more appro- 

 priately named the Kuttung Series by 

 Prof. Sir T. Edgeworth David & Mr.. 

 C. A. Siissmilch, 1 after their important 

 investigation of the southern continua- 

 tion of these rocks in the Newcastle dis- 

 trict, 100 miles beyond the region here- 

 considered. In the Newcastle district the 

 Kuttung Series represents, in all pro- 

 bability, the Middle Carboniferous, and is 

 followed by the so-called ' Permo- Carbon- 

 iferous System,' — the Lower and Upper 

 Marine Formations, and the Coal Measures. 

 The relationship of the Permo-Carbon- 

 iferous to the Carboniferous proper has- 

 been discussed by Sir Edgeworth David 

 in the paper already cited, who concluded 

 that the former was chiefly of Permian 

 age, although the basal part was probably 

 coeval with the Upper Carboniferous 

 (Uralian) rock elsewhere and generally 

 rests unconformably upon the Middle 

 Carboniferous beds. 



In the region here considered, these 

 marine Permo- Carboniferous rocks are not 

 present, although there is a small develop- 

 ment of the Coal Measures lying uncon- 

 formably upon the Kuttung Conglo- 

 merate. There are in this area minor 

 developments of Jurassic sandstone and 

 of Tertiary gravels and volcanic rocks, but 

 discussion of these hardly lies within the 

 scope of this paper. 



The Devonian and Carboniferous rocks 

 have been greatly folded. The former 

 (see fig. 2) occur in a series of tightly 

 packed and broken folds lying west 

 of the great composite granite-batho- 

 lith of New England, which has invaded 

 them. The highly folded rocks are sepa- 

 rated from the less folded strata farther 



1 Journ. & Proc. Eoy. Soc. N.S.W. vol. liii 

 (1919) pp. 246-338. 



