120 
were of ‘“‘the same kind of fossil formation as that on the banks 
of the Murray.” This correlation applies to the Miocene only. 
3. Aldinga Bay and Hallets Cove, east side of St. Vincent 
Gulf. 
Only the basal part of the Miocene Series is here fossiliferous, 
and because. of the prevailing sandy matrix, the majority of the 
fossils are in the state of casts, though occasionally, when the 
matrix is more consolidated and somewhat calciferous, the tests 
of the fossils occur as pseudomorphs after calcite, though those 
originally calcitic are unaltered. 
The fossiliferous Miocene beds directly overlie those of the 
Eocene, and the stratigraphical discordance between them is 
marked by erosive surfaces, more or less of the nature of pot-holes, 
but more particularly by the transgression of the Miocene over 
the edges of the Eocene strata, which have a higher dip; this 
feature is most discernible in the face of the cliffs extending from 
the jetty southward towards Schnapper Point for a length of a 
hundred chains. The topmost of the hard arenaceous bands of 
the Miocene in Blanche Point, which is at an elevation of 80 feet 
above sea-level, declines to high water-mark at Schnapper Point 
in a distance of two miles, corresponding with a dip of 1 in 132. 
In Maslin’s Beach to the north of Blanche Point, the echino- 
dermal bed of the Eocene shows a dip of 2° 7’ in approximately 
the same direction, that is south-west, as that of the observed 
inclination of the Miocene to the south of the jetty ; but moreover, 
in the north face of Blanche Point, which has appr oximately an 
east and west bearing, the Eocene strata have a dip of 5°, whilst 
the Miocene beds are apparently horizontal. 
At the mid-part of the Aldinga Bay section the Miocene con- 
sists, in the basal portion of ‘sharp sands and calciferous sand- 
stone, and in the upper portion of unfossiliferous blue clays, 
which change to the northward into red mottled sands and sandy 
clays, also unfossiliferous. 
Beyond the limits of the occurrence of Eocene beds to the 
northward, as about Pedlar’s Creek (sections 353, 356, 359, see 
map), the base of the Miocene is a conglomerate, resting on 
Archean rocks, succeeded by a calciferous sandstone more or less 
commingled with pebbly grit in which fossils occur ; the upper- 
most and larger part of the sections consists of variously colored 
sands and sandy clays. The finest sections of this type occur 
from a little north of Witton Bluff, by the mouth of the River 
Onkaparinga to beyond Black Point, forming the north headland 
of Hallett’s Cove ; beyond this the Miocene thins off and is re- 
presented by the conglomerate-base, which on the cliffs at Marino, 
south side of Holdfast Bay, is covered by the mammaliferous 
drift of the Adelaide Plain. 
