223 
May 81, 1912. The Queensland Naturalist. 
Our next trip was to Mt. Greville. This peak stands 
in solitary grandeur opposite Mr. Alford, and is about 2,700 
feet high. It was found to be composed of grorudite — 
a quartz variety of trachyte containing riebeckite horn- 
blende. A magnificent gorge runs three-quarters of the 
way up the mountain and affords a fairly easy ascent. This 
gorge is over half a mile in length, and in places is only 
10 yards wide. The walls rise vertically from 100 to 200 
feet in height. In places, the rocky walls are covered with 
staghorns, elk-horns and bird-nest ferns. The gorge has 
apparently resulted from the decomposition of some former 
basic dyke. Across it run several smaller clefts. 
On emerging from the gorge, the Usual forest vegetation 
was met with, and from a rocky spur, a magnificent 
panoramic view of the surrounding country was obtained. 
In front stand Mt. Moon and Mt. Alfoid with Glennie’s 
Pulpit, and in the distance, behind these, are the lofty 
peaks of the Macpherson Range. The lonely Mt. Barney 
(4,650 feet) — the heigheso peak in the neighbourhood — 
is also very ^prominent. In the foreground, Reynolds’ 
Creek meanders down the valley, whilst on the right is the 
Main Range. One can not help noticing how the peaks of 
this range rise to almost similar heights. We have Mt. Cor- 
deaux (4,100 feet), Mt. Mitchell (4,100 feet), Spicer’s Peak 
(4,050 feet), Mt. Huntley (4,150 feet) and Mt. Roberts, 
(4,350 feet). Between the first two mountains is Cunning- 
ham’s Gap, through which a bridle track runs. The 
Warwick road passes up through Spicer’s Gap, which is 
situated between Mt. Mitchell and Spicer’s Peak. All 
these peaks, as Dr. Woolnough explained Avhen we first saw 
them, are probably the remnants of a denuded pene-plain 
which once stretched continuously over the present Fassi- 
fern Valley and the Darling Downs. Mature streams had 
cut their U-shaped valleys through it, but a large fault 
took place along the line of our present Main Range and 
the eastern side Avas let doAvn. The heads of the streams 
that formerly floAved Avest, Avere thus cut off, and their old 
valleys form the present “air-gaps” which are knoAvn to 
us as Cunningham’s Gap, and Spicer’s Gap. 
Mt. Greville affords a splendid station for studying 
the physiography of the surrounding country, and for this 
reason, as Avell as for its beautiful palm gorge, ought to 
be reserved by the Gove’nment as a national park. 
We next visited Mt. Edwards. This is another 
detached mountain, or rather tAvin mountain, for it con- 
sists of two peaks with a large V-shaped valley between 
them. The creek runs through the A^alley to the north, 
but at first sight from the general appearance of the gorge, 
one feels convinced that the stream is running in the opposite 
direction. As Mr. Wearne pointed out, this is probably 
