80 
SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 
489 feet. An estuarine clay resembling that now forming at the mouths 
of Victorian rivers. 
476 feet. A consolidated foraminiferal sand with many species of fora- 
minifera and ostracoda indicating an open sea. 
445 feet. Shelly beach-sand with bivalves and foraminifera in inter- 
calated clay particles and silty layers. In this sample Ostrea 
sp. was found. 
438 feet. Dune-rock. This is the lowest occurrence of undoubted 
terrigenous and dune conditions. Such, interrupted by occa- 
sional estuarine deposits, persist to the surface. 
In regard to the surface beds, Chapman assumes that the loose 
calcareous sand down to a depth of 67 feet represents the Holocene 
— an assumption based on physical rather than palaeontological 
evidence, and consequently unsound. In restricting the down- 
ward limit of the Pleistocene to 489 feet, he relies on fossil species 
that are still living in adjoining waters and is on safer ground. 
The dune-rock, in its sporadic occurrences, is consolidated, he 
states, exactly like the old Sorrento limestone, and, it may be 
added, like that reached by the bores put down on the sand banks 
in the Bay (vide p. 87) and in the cliff at Queenscliff. It therefore 
extends across the whole width of the Nepean Bay Bar. 
Below 489 feet there is, to quote Chapman, “no tangible 
palaeontological evidence on which to work in regard to the 
delimitation (of the Werrikooian), but in lieu of better evidence, 
we have taken the depth from 490 feet down to 520 feet as probably 
comprised in this series ... In the present series allocated 
provisionally to the Werrikooian at the depth above indicated, 
the nature of the deposits . . . show a good deal of relationship 
to the Pleistocene.” This delimitation of the Werrikooian is 
mentioned because surface beds near St. Leonards may be 
Werrikooian. 
His correlation of the beds at 585 feet with the Pliocene (Kalim- 
nan) is sound. 
The Wannaeue Bores comprise eight bores (Fig. 2) put down 
along the E.b.S. boundary of the Nepean Bay Bar about 8 miles 
E.S.E. of the Sorrento Bore. Bore No. 1 Wannaeue is on the 
upthrow side of Selwyn’s Fault, No. 2 to 7 Wannaeue and No. 2 
Fingal on the downthrow side and consequently on the Nepean 
Bay Bar. No. 4 Wannaeue which was started about 20 feet 
above sea level has here been selected for a correlation with the 
Sorrento Bore. In it, as in all others put down at the time, 
samples were taken throughout the depth bored — there were no 
intervals as in the Sorrento Bore — and the core was examined by 
the author as it was brought to the surface. 
