Upper Silurian Hocks. 
37 
vertical bands are not uncommon. Tho general strike of the 
Upper Silurian strata is from N.N.W. to N.W., though at Cape 
Liptrap and Turton’s Creek it takes the abnormal direction of 
from N. 10° E. to N. 30° E. Considerable contortion is also 
observable in the rocks along the Capo Liptrap coast. (See Figs. 
6 and 7.) 
Fig. G. — Section. 
Sea-level. 
These rocks exhibit as many varieties of texture, colour, and 
hardness as do those of the Lower Silurian group, but are usually 
less slaty than the latter. -p I0 - _p r 
They consist principally steep Si ,; rian tan ,' (3 . 
of sandstones, mud - 
stones, rubbly shales, 
and, occasionally, slates 
or schists. Breccias, con- 
glomerates, and quartz- 
ites are sometimes met 
with, as at Heathcote, 
Anderson’s Creek, the Alexandra district, Capo Liptrap, and 
other localities. At. Capo Liptrap and Tur ton’s Crock are bands 
composed of a curious mixture of volcanic and calcareous sedi- 
mentary ingredients. Limestones of very excellent quality occur 
at Lilly dale, at Warntah Bay, east from Cape Liptrap, and near 
tho Tyers River in Gippslaiul. Bands of nearly white, some- 
what slaty, saceharoidal marble and grey sub-crystalline limestones 
occur among what aro supposed to be Upper, but may be Lower, 
Silurian rocks in tho Limestone River, one of the beads of the 
Murray; and in the heads of the Buchan River, on the south side 
of the Main Divide, is an outcrop from beneath the Snowy River 
porphyries of the previously mentioned acutely corrugated meta- 
morphic calcareous schist, the geographical position of which is 
also doubtful. 
Further north, however, on tho Gibbo River, is a similar lime- 
stone, in which Mr. A. W. Ilowitt found a fossil, identified by 
Professor McCoy as Palceopora, indicative of Upper Silurian. 
Other more or less calcareous bands arc not unfrequent. 
Several masses of encrinital limestone, or marble, occur in the 
valley of the Thomson River in Gippslaiul, and one near the 
Delat ite River, 5 miles westerly from Mansfield. A striking 
similarity of lithological character exists between all of these, 
and, though far apart, they aro in the same belt of rock-bands^ 
The limestone is grey to dark bluish-grey, compact to crystalline, 
and full of crinoid stems replaced by carbonate of lime. On being 
