112 
Gambier, becoming more and more arenaceous, with a correspond- 
ing decrease of polyzoa and increase of the mollusca, till at Pin- 
naroo we get the almost typical Murravian bed. The chief 
objection to this view is that if the dip of three feet per mile, as 
shown between Narracoorte and Port MacDonnell, were continued 
northwards, the Murray Cliffs should be about 1,000 feet above 
sea level, excluding the Miocene covering ; whereas the Eocenes 
of the Murray rarely reach an altitude of more than 200 feet. 
Still, this is not a very serious objection, as we saw that the beds 
at Bordertown are not nearly so high as they would be according 
to this dip, and so we might very reasonably consider that the 
beds further north ought to have very little dip at all, if any, or 
perhaps they may undulate to a small extent. 
The country to the west of Bordertown, to the Murray, is 
practically a geological terra incognita. As the ground descends 
considerably from Bordertown along the line, so that at Wirrega, 
13 miles away, the altitude is 210 feet; and at Keith, 15 
miles further, only 101 feet, one might expect an outcrop 
of the polyzoal limestone to occur; but I have been unable 
to hear of any such outcrop,—and it is improbable that one could 
exist without being known,—so we may assume that there is none 
such. However, at Coonalpyn, Ki Ki, Tintinara, and Emu Flat 
bores have been put down by the Government ; and the Conser- 
vator of Water, Mr. Jones, allowed me free access to the boxes of 
samples of stone obtained from them. Each bore meets Eocene 
strata at a moderate depth below sea-level, and of considerable 
thickness, while all four bores show great similarity in the beds 
through which they pass. 
Ki Ki, the most westerly bore, is situated on the railway line 
about 105 miles from Adelaide, or nine miles west of Coonalpyn. 
The mouth of the bore is 68 feet above sea-level, and the total 
depth of the bore 666 feet. 
For a depth of 145 feet, or to 77 feet below sea-level, unfossil- 
iferous limestones are found. Then comes a bed of Eocene 
polyzoal limestone, having a thickness of 195 feet, but containing 
few fossils other than polyzoa. This bed is met with in each bore, 
and from it I have obtained Jerebratulina lenticularis, T. catinuli- 
formis, Magasella sp., Salenia tertiaria (2), and Scutellina patella. 
Below this in each bore is found a black clay intercalated with 
fossiliferous sands. 
In the Ki Ki bore these clays and sands alternate for 108 feet, 
or to a depth of 380 feet below sea level, when the bed rock is met 
with at first a light colored clay, becoming by degrees much 
harder till at the base of the bore, 600 feet below sea level, it 
becomes almost a slate. 
The black clay is very noteworthy. It varies from a brownish 
