353 
Details of Bores Nos. 1 to 11, etc. — continued . 
Bore No. 9— continued. 
Depth (feet). 
Nature of Rock. 
Details and Fossil Contents. 
315-325— 
continued. 
• • • • • • 
Gasteropoda. — Liopyrga quadricingulata, 
Tate ; Rissoa ( Onoba ) bassiana, Hedley; 
Calyptrcea corrugata, Tate ; C. kalimnce, Chapm. 
and Gabr. ; Natica cunninghamensis, Harr. ; 
N. hamiltonensis, Tate ; N. subvarians, Tate ; 
Turrilella pagodula, Tate ; T. tristira, Tate ; 
Tylospira coronala, Tate sp. ; Marginella pree- 
jormicula, Chapm. and Gabr.; Voluta weldi, 
T. W.; Ancilla papillata, Tate. 
Crustacea. — Balanus psitlacus, Molina sp. ; 
B. varians. Sow. ; Macrocypris decora, G. S. B. ; 
Cythere dictyon, G. S. B. ; C. parallelogramina, 
G. S. B. ; Cytherella polit-a, G. S. B. ; C. pul- 
chra, G. S. B. 
Pisces. — Carcharodon auriculatus, Blainv. 
sp. (tooth of a young individual) ; Mylio- 
batis moorabbinensis, Chapm. and Pritch. ; 
fish vertebra, indet. ; otoliths of teleostean 
fishes. 
Notes on Bore No. 9. 
i 
At several levels down to 90 feet, hard, calcareous and concretionary lime¬ 
stone bands occur. One bed in particular, at 56-69 feet, appears to be a de¬ 
posit such as is found at the present day in and around the saline lagoons in 
central and parts of southern Australia, which are inhabited by mollusca 
such as Coxidla and other forms living in brackish water. These limestone 
deposits, found a little below the surface nearly all over the Mallee, 
are in all probability due, as explained by Howchin and Gregory 1 , 
to the effect of the hot sun and dry wind causing the evaporation of the 
surface moisture (sometimes an inch per day), and a consequent upward 
suction of water charged with calcareous matter (sometimes ferruginous) 
from the lower depths. The deposition of this mineral matter takes place 
just beneath the surface of the loose soil, and results in a hard “ pan.” 
Between this bore and the previous one some striking differences are 
noticed in the thickness of the superficial deposits. The usual bed of grey, 
micaceous, silty sand, for instance, is here represented by no less than 163 
feet, as against that of 36 feet in bore No. 8. This points to a sudden 
deepening of the estuarine area at the present spot, caused by subsidence 
synchronous with deposition of silt. That the whole sedimentary series is 
thicker in the locality of bore No. 9 is indicated by the proportionally greater 
depth at which the Kalimnan beds lie under their Pleistocene cover ; for we 
do not get typical Kalimnan fossils until 254 feet is reached, as compared 
with 160feet of bore No. 8, thus showing a discrepancy of nearly 100 feet. The 
sample from 254-256 feet yields a typical Kalimnan facies; whilst at 256-263 
feet the fauna contains an admixture of Janjukian species such as Pecten 
peroni . The large number of Ostracoda in the last-named sample is 
noticeable. The mixed faunal characters of Kalimnan and Janjukian obtain 
to the end of this boring at 315-325 feet. 
1 See Gregory, J. W., Geography of Victoria, 1903, p. 92. Also Howchin, W„ Trans. Roy. Soc. 
S. Aust., Vol. XXVII., Pt. L, 1903, p. 84. 
