ON CUPRIFEROUS TUFFS. 



275 



2._CUPRIFER0US TUFFS OF THE PASSAGE BEDS 

 BETWEEN THE TRIASSIC HAWKESBURY SERIES, 

 AND THE PERMO-CARBONIFEROUS COAL-MEA- 

 SURES OF NEW SOUTH WALES. 



By T. W. Edgeworth David, B.A., F.G.S., Geological 

 Survey of New South Wales. 



INTRODUCTORY. 



The late Reverend W. B. Clarke divided the workable Coal- 

 measures of New South Wales and their associated formations, 

 including the ovei'lying Hawkesbury and Wianamatta Series, in 

 the followins; manner* : — 



Mesozoic. 



PALiEOZOIC. 



jWianamatta Shales. 

 (Hawkesbury Sandstone. 



1. Upper Coal-measures. 



2. Upper Marine Beds. 



3. Lower Coal-measures. 



4. Lower Marine Beds. 



Mesozoic Triassic. 



Mr. C. S. Wilkinson, F.G.S., etc., in the latest edition of his 

 " Notes on the Geology of New South Wales," adopts the following 

 classification for these rocks, separating the Narrabeen beds from 

 tlie Hawkesbury : — 



f Wianamatta Shales. 

 (Hawkesbury Series. 

 [ Upper Coal-measures, Newcastle Series. 

 'Permian. J Middle Coal-measures, East Maitland 

 [ Series. 



Palveozoic. - 



{1. Upper Marine Series. 

 2. Lower Coal-measures. 

 6. Greta & Stony Ck. Ser. 

 3. Lower Marine Series. 

 He also describes the chocolate shales which underlie the 

 Hawkesbury Sandstone. [See pp. 74-75], but regards them as 

 an integral part of the Hawkesbury Series. 



* Remarks on the Sedimentary Formations of New South Wales, by the Re\-. W. B. 

 Clarke, M.A., F.R.S,, 4th Edit., p. 66. 



