SOME GEOLOGICAL NOTES ON COUNTRY BEHIND JERVIS BAY. 3095 
duodecimacostata, and other fossils typical of the Upper 
Marine. As the dip of the strata agrees very closely with 
the general slope of the country from Sassafras to Nowra, 
the beds of sandstone of the latter locality are probably 
not much higher up in the series than those of Sassafras. 
The Nowra sandstones contain Productus brachythcerus, 
Martiniopsis subradiata, Spirifer duodecimacostata, 
crinoid stems, Conularia and Chcenomya. 
In the Clyde gorge, Mr. Jaquet found that lower members 
of the Upper Marine and also the Greta coal measures 
occur. This is to be expected, as the dipis N.H. In the 
sandstones above the coal he found Martiniopsis subradiata 
and Productus brachytherus. Near Conjoia he also found 
Meceonia carinata. The supposed glacial horizon mentioned 
above is probably identical with the one found by Mr. H. O. 
Thiele at Crookhaven Heads.* 
Ore Deposits.—The south coast to the south of Nowra is 
so poor and barren that unless the burrawang (Macrozamia 
spiralis), grasstree (Xanthorroea) and other indigenous 
plants can be made of commercial use the district will have 
to rely on its mineral resources for its future prosperity. 
Yalwal, Nerriga, Braidwood, Nelligen, Moruya,and Araluen 
are important and well known goldfields. Most of the old 
mines and alluvials are worked out and now these fields 
are almost deserted. There remains, nevertheless, a hope 
that with more thorough prospecting, reefs of greater per- 
manency may be found. Metals other than gold have been 
hardly looked for. Yet in many of the wild gorges which 
empty themselves into the Shoalhaven and Clyde great. 
mineral wealth lies unexplored and untouched. 
The axes of folding and the lines of faulting of the older 
rocks of the Currockbilly Range are almost due north and 
south. It will beseen that the galena-zincblende-mispickel 
1 Proc, Roy. Soc., Vict., 1903. xv1., pt. 1, pp. 57 — 59. 
T—Dec. 2, 1908. 
