54 
Geology and Physical Geography : 
It was ascertained by Mr. Howitt and myself that the 
Iguana Creek beds are continuous to Maximilian Creek, around 
Fig. 15. — Mitchell River, above Glenalladale. 
soft 
60FD 
90 F7J 
Ft. 
(d) Hard yellow and reddish sandstone 20 
(c) Conglomerate and quartzose sand- 
stone. In places hardened by 
ferruginous infiltrations. Where 
not st), rapidly disintegratingand 
forming cavernous hollows under- 
neath the beds (d) ♦. ..30 
(6) Rubbly shale— red or slate-coloured, 
and in places calcareous . . 10 
(a) Thick-bedded quartzose sandstones, 
resting on red rubbly rock, with- 
out apparent stratification, which 
is the lowest bed visible . . 60 
110 
Mitchell 
River. 
the flanks of the pro 1 
mineut ranges, com- 
posed of the Middle 
Devonian shales and 
quartzites of the Tabberabbera and Cobannah series, which here 
Fig. le.^MAxraiLiArf-CitEEK. separate the Mitchell and 
Avon drainage-areas. At 
Maximilian Creek wo 
found, rest ing on the edges 
of the nearly- vertical De- 
vonian rocks, a sequence 
of slightly dipping Upper 
Devonian beds similar to 
that of the Iguana Creek 
layers, the lowest being 
conglomerates and COn- 
fa) Hard crystalline quartzite lying at a high angle, 
but the dip is uncertain, owing to strong joints. It is 
penetrated by large dykes striking N. 30 ft E. The dip 
of the quartzite may possibly be N. 30 E. at 80". 
fa) Thick- bedded coarse sandstones with a few 
pebbles. 
fa) Coarse conglomerate of quartz, indurated slate, 
and sandstone pebbles. 
(d) Thick sandstones. 
(c) Quartz porphyries; porphyritic.quartziferous, and 
concretionary fel&tones, which are in places rough and 
scoriaceous in appearance, owing to irregular cavities. 
glomeritic sandstones, 
followod by felstone por- 
phyries (contemporane- 
ous), above which again 
are alternating conglome- 
rates, sandstones, &c. 
(Figs. 15, 16, and 17.) 
