GEOLOGY OF NORTH GIPPSLAND, VICTORIA. 2h 
The section as seen at Iguana Creek, commencing at the river- 
level, consists of alternating shales, sandstones, quartz-grits, and 
conglomerates. The shales are either without apparent stratifica- 
tion and of a brick-red or purple colour, or thinly laminated and 
bluish or greenish grey, and it is in these latter that I have found 
the plant-remains before mentioned. 
Plant-impressions are, however, common, but indistinct in charac- 
ter, though frequently indicating the ribbon-like character of Cor- 
daites. The conglomerates are of quartz and other hard and sili- 
ceous rocks, and together with the sandstones and quartz-grits 
intermingle and exhibit interesting examples of false bedding and 
changing condition of deposits. The upper parts of the series are 
mainly quartzose sandstones; and some of the lower rubbly shales 
become locally nodular and calcareous. 
The thickness of the series visible at Iguana Creek is probably 
under 800 feet. The continuity of the beds is unbroken to Tabbe- 
rabbera, as I ascertained last summer by descending the Mitchell 
River in a canoe, accompanied by two black fellows, and by that 
means was able to examine the constant succession of grand natural 
sections which the rocky gorges of that untraversed river-valley 
present, which would not be accessible, except in isolated places, by 
any other means. 
Having premised that the Iguana-Creek beds continue in an un- 
broken manner to Tabberabbera, about 20 miles, I must now, in 
order shortly to point out the interesting features of this Upper De- 
vonian group, refer to a locality where the natural sections will 
be found to disclose the underlying older Paleozoic rocks, which no 
doubt elsewhere also underly the Iguana-Creek beds at no great 
depth. 
"he valley of the Mitchell River shows at Tabberabbera sections, 
two of which I have condensed in the sketch, fig. 8. The lower nearly 
vertical shales, sandstones, and limestones contain Middle Devo- 
nian marine fossils, and have evidently, together with the still older 
Palzozoic sedimentary rocks, been tilted, compressed, and denuded, 
so that at present their extension to the north is undetermined be- 
yond a distance of 2 miles from Tabberabbera, and is quite undeter- 
mined to the east and west. To the south they extend down the 
Mitchell River to near Cobbannah Creek. Lying nearly horizontally 
on these, the slight dip being southward, we find about from 800 to 
1000 feet of sandy shales, conglomerates, and sandstones, principally 
of a reddish or yellowish colour. We have here the north-eastern 
escarped edge of the Iguana-Creek beds. esting on the lowest bed, 
a red sandy shale, is a sheet of porphyritic and nodular felstone, in 
which irregular cavities have been filled by agate or quartz, either 
completely or as geodes. Above this is the remainder of the series 
of conglomerates and sandstones. 
The same sequence of beds is seen in following down the Mitchell 
River to Cobbannah Creek, where the felstones sink out of sight, 
and where the overlying sedimentary strata are about 500 feet in 
thickness. The felstones show as a rugged cliff where last visible, 
