28 A. W. HOWITT ON THE PHYSICAL GEOGRAPHY AND 
about 80 feet above the river, and they present almost the same tri- 
plicate appearance of compact beds with either porphyritic ortho- 
clase and quartz crystals, or quartz crystals alone, in a compact base, 
and one well-marked bed of nodular and geodic felstone. The re- 
markable persistence of these well-marked divisions over so large an 
area leads me to regard this as a contemporaneous sheet. 
Dykes and masses of diorite and of other basic igneous rocks, which 
I have not as yet been able satisfactorily to determine, of porphy- 
ritic and quartziferous felstones, have penetrated, cut off, and gene- 
rally disturbed the nearly vertical Tabberabbera shales, but do not 
seem to have risen up through the Iguana-Creek beds. 
In Maximilian Creek, about 16 miles to the westward of Iguana 
Creek, which I lately visited in company with Mr. Reginald Murray, 
of the Geological Survey of Victoria, I found the series of strata 
shown in the subjoined sketch (fig. 9), which has been condensed 
from several natural sections. : 
Fig. 9.—Diagram Section of Group of Beds at Maximilian Creek. 
. About 800 feet... 
a. Quartzite. d. Porphyritic, quartziferous, 
b. Coarse quartz and slate conglome- and concretionary felstones. 
rate. e. Shales. 
ec. Coarse reddish sandstones with jf Quartz conglomerates. 
pebble bands. g. Sandstones with pebbles. 
I need only point out that, making due allowance for slight litho- 
logical differences, we have here identically the same series of rocks, 
both sedimentary and igneous, as that seen at Tabberabbera and 
the Mitchell River near Cobbannah Creek. ; 
In following the northern edge of the Iguana-Creek beds no break 
is found to the westward, and they appear continuous with those at 
Maximilian Creek. 
In the absence of any paleontological evidence the indications 
afforded by the groups of strata themselves are stratigraphically so 
strong that I have no hesitation in regarding the Maximilian-Creek 
