'N 1 ! 1 
iLeasiiies from the surface of this ]) ero-hulc is estimated hy j^tr. J. ]Mackeii/a(', 
IhG.S., the Examiner (n‘ Coal-lields, to l.'o over 2,000 ([)rohahly 2,000 feet).'^' 
T!io horizon of the ]'hsh-'l)cd in this here may he represented l;y the t^veniy feet 
(about) of ehoeolate shaies struck rit a deptli of 015 feet. 
The Jarley Eorc at IManyrove Creek, ILawkcsljury, penetrated to a 
dentil of 132 ft, 8] in. vritliout reaching’ tiie Coal Zileasurcs.t The strata of 
this l)orc cannot lie correlated with those of tlie three liores already mentioned. 
A comparison of tlic ^lullet Creek Eorc nith the Onriml)ah suggests the 
possi1)ility of the identity of the 150 feet of chocolate, blue, and green sliales 
in tlie lower part of tlio former bore with the similar shales struck at 117 feet 
in tlie latter, and the 117 feet of sandstone, shale, and fine conglomerate in 
the latter may be identical with the 109 feet of “grey and brown sandstones 
and shales with I*h'jUotheca,'^ in the former. In this case tlic depth of the 
Coal iMeasnres below the Gosford Eish-bed (should the Newcastle Measures 
underlie tliis arei) would bo only about the same as Ourimbah, viz., about 
1,800 f(>et. 
The oeeurrenee of such a thickness of sandstone, as proved in the 
Ourimbah Bore, below the level of the purplish grey shales and flaggy sand- 
stones of the Gosford Eish-bed, renders it doubtful whether the bed belongs 
to the loAver portion of the IlaAvkoslAury Sandstone or to tlic upper portion of 
the Narrabeen Shah's. 
The details of the Section of the" Eailway Ballast Qu^iny shoAV that 
the Eish-bed lies at the top of a group of flaggy hard sandstones, alternating 
with purplish grey shales with occasional thin bands of clay ironstone. This 
group, as proved by a neighbouring railway entting, has a thickness of at 
least fifty feet. The flaggy sandstones are strongly rijiple-markcd, and the 
intercalated shaly beds contain numerous plant remains, too fragmentary, 
however, for identification. The purplish colour of these shales suggests 
that they may lie composed jiartly of altered tuffaceo’as material like the 
purple shales of llolt-Sutherland and Bulli. 
Capping these thin and even-bedded strata is a thickness of about 
eighty-tivc feet of massive coarse grey sandstones with patches of gravel, and a 
lenticular band of coarse pebbles immediately overlying the Eish-bed. The line 
of junction betuTcn the Eish-bed scries and the coarse overlying sediments is 
* Ann. Report Uept. of JiJiaes, N. S. Vi’ales, second pLato, between pp. 208 and 209. 
t Ai;ii. Report Dept, of Jlincs, N. S. Wales, 1578, Rlatc No. 50. 
