401 
At 582 feet a presumably Palaeozoic rock was met with, described as a 
“ soft reddish-brown argillaceous rock, decomposed.” This passed down¬ 
wards into a soft yellowish-green and very soft dark-green argillaceous and 
decomposed rock, and finally, at 666 feet, into “ hard, green, slaty rock, 
with quartz.” 
The Portland Bore. 
A boring in search of coal 1 was put down in the botanic gardens reserve, 
reaching a depth of 2,265 feet. It ceased in strata containing shell impres¬ 
sions. A second bore was put down near the Surry Biver to the depth of 
1,504 ft. 11 in., ceasing in limestone. No samples of these borings appear 
to have been preserved, but from the fact that the polyzoal rock at Portland 
is met with at about sea-level, it may be assumed that the entire depth of 
the bore was in polyzoal limestone. The cliffs at Portland yield typical 
Kalimnan fossils, as the following list from a small collection in the National 
Museum will show :— 
Lovenia woodsi , T. Woods sp. 
Leda acinaciformis , Tate. 
Gly timer is Jialli , Pritchard. 
Ostrea manuhriata, Tate. 
„ sturtiana, Tate. 
Corbula coxi , Pilsbry. 
Liopyrga quadricingulata, Tate. 
BanJcivia sp. 
These fossils are noted on the labels in the collection as occurring in the 
upper, middle and lower beds of the cliff section, and therefore graduate 
into the polyzoal limestone of the beds at and below sea-level at Portland. 
Tenison Woods states 2 that “ at Portland Bay, about 50 miles east of South 
Australia, where the coast action has exposed a fine section, the coralline 
limestone is seen underneath ” the volcanic rock. This “ coralline lime¬ 
stone ” is the same as the polyzoal limestone of Mount Gambier, and which 
forms the lower series of the Mallee bores. 
The Sorrento Bore. 
This bore was put down for the investigation of the coal deposits in the 
Cape Schanck peninsula. The geological results obtained from this boring 
are of the greatest importance, since nearly the whole of the Tertiary beds 
was passed through, although bed-rock was not reached when boring ceased 
at 1696 feet. 
A preliminary report was furnished by the writer in 1910 3 as 
follows :— 
“ From a geological or stratigraphical stand-point this boring is one of 
the most important ever put down in the State, for it gives the succession of 
the Tertiary beds in the most complete form obtainable, since in no other spot 
would there be such a continuous and extremely thick deposit of practically 
the whole of the Tertiary series. 
From the surface to 430 feet the principal rock material is more or less 
consolidated dune-sand, alternating with occasional limited bands of brown 
clay. At 489 feet a dark, umber-coloured clay was met with, containing 
1 Ann. Rep. Sec. for Mines, Victoria, 1895 (1894), p. 60. 
* Geological Observations in South Australia, 1862, p. 121, 
* Ann. Rep. Sec. for Mines, Victoria, 1911 (1910), p. 152. 
