32 
The Queensland Naturalist. 
May, 1927 
Fassifern area, a conclusion that would equally apply 
whether the covering of Mount Edwards was basaltic or 
sedimentai’y. 
To return now to the group of roughly parallel 
streams, three short ones running into the Lockyer, two 
long ones uniting only near their junction with the Bris- 
bane close to Ipswich, and one long one running into the 
Logan, may they not have received their initial parallel- 
ism by being formed on the surface of the one lava flow, 
which they have eroded away. 
This is put forward as a suggestion for consideration 
and further enquiry in the field. There is not enough 
evidence yet to regard it as anything more than a sugges- 
tion, but it is interesting to note that the tributaries of 
the Condamine, on the Avestern side of the divide, still 
largely on the basalt, have a marked parallelism to each 
The Teviot Brook traverses Walloon coal measure 
country of mild contours near Boonah, but before joining 
the Logan, cuts through a range of sandstone hills. These 
are formed of the more resistant Bundamba sandstone 
exposed in a fold, the western limb of which is continuous 
,,,111, +i 10 o-vpnt West iDSwich fault already referred to as 
other. 
valleys and gorges 
Pherson Range, 
courses, separated 1 
>. ^ They run long; more or less parallel 
ted by remnants of the plateau, though in 
