NOTES ON THE CREMORNE BORE. 447 
Coal Measures or of the Tomago Coal Measures of the Hunter 
District. The abundance of bands of clay ironstone in the Tomago 
as well as in the [llawarra Coal Measures inclined Mr. Wilkinson 
towards the latter opinion. 
A later examination of the Illawarra Coal-field, however, by 
one of the authors,* revealed the fact that there was an uncon- 
formability between the top of the Upper Marine Series and the 
base of the Illawarra Coal Measures, as seen in the coast section 
between Wollongong and Bellambi. ‘This suggested the proba- 
bility that the Middle or Tomago Coal Measures had been over- 
lapped by the overlying coal measures (the Upper or Newcastle 
Measures) in the manner illustrated in the sections accompanying 
the report above quoted. 
An examination of the section at the top of the Newcastle 
Coal Measures confirmed the opinion that the Illawarra Coal 
Measures were probably chiefly the equivalents of the Newcastle 
Measures, and the inference was drawn that the Bulli Coal Seam, 
the uppermost in the Illawarra Coal Measures, was identical with 
the Wallarah Coal Seam, the uppermost seam in the Newcastle 
Coal Measures at Wallarah near Catherine Hill Bay, Lake Mac- 
quarie. On paleontological evidence alone, Mr. R. Etheridge, 
Junr., the Paleontologist to the Geological Survey of New South 
Wales and to the Australian Museum, had previously arrived at 
somewhat similar general conclusions. 
The classification at present adopted by us is as follows :— 
(6) Newcastle Coal Measures typically developed at Newcastle, 
Lithgow, Mittagong, and in the Illawarra District. 
(5) Dempsey Beds. 
(4) Tomago Coal Measures typically developed at Tomago and 
East Maitland. 
(3) Upper Marine Series. 
(2) Greta Coal Measures typically developed at Greta, West 
Maitland, and at the Clyde River. 
(1) Lower Marine Series. 
Permo-Carboniferous. 
The following is a table showing the relation of the new classi- 
fication to those formerly adopted :— 
* Annual Report, Department of Mines, 1890, p. 234, 
