xl 
GEOLOGICAL I'EATURES. 
minated by another of those abrupt sand-stone 
passes I have just described, and the traveller 
again falls considerably from his former level, 
previously to his entering on Yass Plains, to 
which this pass is the only inlet. 
From Yass Plains the view to the S. and S.W. 
is over a lofty and broken country : mountains 
with rounded summits, others with towering 
peaks, and others again of lengthened form 
but sharp spine, characterise the various rocks 
of which they are composed. The ranges de- 
cline rapidly from east to west, and while on 
the one hand the country has all the appearance 
of increasing height, on the other it sinks to 
a dead level ; nor on the distant horizon to 
the N.W. is there a hill or an inequality to be 
seen. 
From Yass Plains to the very commencement 
of the level interior, every range I crossed 
presented a new rock-formation ; serpentine 
quartz in huge white masses, granite, chlorite, 
micaceous schist, sandstone, chalcedony, quartz, 
and red jasper, and conglomerate rocks. 
It was however, out of my power, in so hurried 
a journey as that which I performed down the 
