79 
SUNKLANDS OF PORT PHILLIP BAY AND BASS STRAIT 
269 Limestone of shallow-water origin. Structure, porous, and with 
ferruginous staining. Some occasional mica flakes. Numerous easts 
of bivalves, indet. 
275 Liver-coloured clay. Eesiduum after washing, a fine, ferruginous sand 
with a few quartz particles. 
298 Calcareous dune-rock. 
324 Calcareous quartzose sand and grit. 
388 A fine-grained dune-rock. 
397 A liver-coloured clay interbedded with micaceous and sandy mud. 
408 Dune-rock with occasional shells. 
416 Dune-rock. 
430 
438 ,» M 
445 Consolidated shelly beach-sand with bivalves. The intercalated clay 
particles or silty layers contain foraminifera. 
460 Ochreous sandy clay. 
476 Grey calcareous sandstone; actually a consolidated foraminiferal sand. 
489 A dark, estuarine clay. 
490 Ash-coloured clay. The residuum, after washing, is a fine white quartz 
sand. There are no microzoa. 
503 Ochreous sandy clay. The residuum, after washing, consists of an 
angular and subangular quartz sand, with some ochreous particles. 
No organisms present. 
520 Consolidated ferruginous and calcareous sandstone, largely composed of 
microzoa. None determined. 
The dune-rock in the Sorrento Bore from the surface to 178 
feet is referred to as the Upper Dune Series. This series having 
been deposited on a surface of fluviatile erosion varies in thickness ; 
in the Wannaeue Bore No. 4 it is 153 feet thick and in the 
Queenscliff Bore 178 feet thick. The Dune Series in the Sorrento 
Bore from 408 feet to 438 feet, but probably of greater thickness, 
is referred to as the Lower Dune Series. 
Chapman gives a classified list of the fossils in the Sorrento 
Bore with their depths. He determined many thousands of 
species comprising Foraminifera 185 species, Coelenterata 20 
species. Vermes 3 species, Echinodermata 77 species, Mollusca 257 
species and Arthropoda 69 species. 
The following conditions of sedimentation and accumulation 
are suggested by Chapman’s descriptions of the core samples: 
1,680-585 feet. Highly fossiliferous marl, sand rock, and sandstone, with the 
sandy beds predominating in the upper limits. This is taken 
to indicate a gradually shallowing open sea. 
585 feet. The summit of the Pliocene. The core was a shell sand with 
grit and pebbles which with microscopic shells were polished 
by wind action. Chapman says that they indicate shallow 
water and strand line conditions. 
503-490 feet. An unfossiliferous clay, representing, presumably, the deepest 
fresh-water beds in the bore. 
