GHOLOGY OF NORTH GIPPSLAND, VICTORIA. 25 
westward, wherever the nearly vertical strata have been laid bare 
by denudation and erosion, these strata, shales, and quartzites re- 
semble those of Tabberabbera more than any others in the district, 
and of these they are apparently an extension. Such rocks are to be 
seen at Cobbannuh Creek, at Davy’s Nob, and thence through to 
Maximilian Creek, where they constitute the “bed rock” of the 
gold-workings. 
The subjoined section (fig. 8) will convey an idea of the position 
of the Tabberabbera shales, and is also applicable in its general 
features throughout the localities which I have just named. 
Fig. 8.— Diagram Section across the Mitchell River near Tabberabbera. 
8.W. Mitchell River. N.E, 
a. Tabberabbera Shales (Middle Devonian). 
6. Iguana-Creek beds (Upper Devonian). 
ce. Felstone sheet. 
The Tabberabbera shales have been greatly disturbed and pierced 
by dykes and masses both of basic and acidic igneous rocks. The 
former are probably doleritic or basaltic, and the latter porphyritic 
and quartziferous felstones. 
One peculiarity in regard to the position of the Tabberabbera 
shales deseryes mention. The Lower Paleozoic rocks in most places 
constitute the “ foundation ” on which the Upper Paleozoic strata 
have been laid down; but here we find that the Tabberabbera shales 
have, together with all older formations, been folded, compressed, 
and denuded ; and on the surface thus formed the nearly horizontal 
Upper Devonian beds are found to rest. We have therefore the 
second great stratigraphical break, or horizon, between the Middle 
and Upper Devonian formations. Although the distinction between 
the amount of disturbance by which the strata above and below this 
plane have been affected is more marked than the analogous difference 
of disturbance above and below the First Stratigraphical Horizon, 
yet I think that this is due merely to the fact that in descending in 
time we find that each successive group of rock-formations has been 
subjected to a cumulative series of disturbing forces. 
(f) Upper Devonian.—The various isolated groups of strata which 
have been referred to the Middle Devonian period appear to be 
merely the remains of a once widespread formation which probably 
extended over the whole of North Gippsland. The sketch section 
which I have given (fig. 8) will, to a certain extent, show the facts ob- 
seryable at Bindi, Tabberabbera, and other places, from which it is 
evident that the denudation to which that formation was exposed re- 
