June 80, 1908. The Queensland Naturalist. 
47 
III. Drainage,. 
The western side of the mountain is drained by small 
creeks, running off the shelf as cataracts, like the Witch’s 
Fall, and loining the Canungera Creek after short courses. 
The south-western end is drained by Sandy Creek, the 
upper part of which is known as The Gorge. Sandy Creek 
leaps over the verge at Cameron’s Falls, and is usually well 
provided with water. The east-central and south-eastern 
ends are drained by Guanable and Pine Creeks, tributaries 
of the Coomera. At the southern end of the mountain is 
a gap or pass, affording a means of communication by horse 
or waggon from Canungera Creek to Pine Creek. The 
most beautiful scenery of the mountain is on Guanable 
Creek, at the head of which, in dense scrubs, are The Little 
and Great St. Bernard’s Palls. The latter form a series, 
access to whicli can be obtained by means of a ladder 
over the cliff, and a descent through the scrub to the first 
fall ; and a climb down a rocky slope by means of a fencing 
wire to the second. The third fall must be approached 
from below. One of the most beautiful walks on the 
mountain can be obtained by crossing the creek at the old 
bullock road above the first fall, and following it to the main 
road two miles below St. Bernard’s. The north-eastern 
flank is drained by Cedar Creek, which descends from 
the mountain in a beautiful series of falls, called by the 
same name as the creek. There are also falls on a tributary 
called Curtis Creek. 
IV. Geology. 
East and west of the mountain the rocks belong to the 
Trias-Jura system, similar to but less recent than those 
around Ipswich, Walloon and Gatton. Overlying these 
is the great cap of basalt forming the mountain. The 
Trias-Jura beds are shales, sandstones and conglomerates, 
and as they weather much more quickly than the hard 
basalt, the foundations of the mountain have been cut 
down to vertical lines, and thus account for the jirecipitous 
sides on the east and west. Around the mountain are 
sandy plains with the usual foliage of oaks, wattles and 
gums ; but the decay of the basalt has given the summit 
of the mountain most fertile red and black soils. The 
sea can be seen from almost any point of vantage on the 
eastern face ; and this proximity to the sea causes copious 
rains . showers frequently occur on the summit when 
sunshine is seen on the plains to the west. 
The basalt is often plainly crystalline, and may then 
be termed dolerite. It contains, on fracture, visible patches 
of a green glass-like mineral — olivine, and large, cross- 
hatched crystals of plagioclase felspar. In places it is 
distinctly columnar, as at the Cathedral Falls, and in the 
