179 



since the Older Pliocene period of 360 feet. The opinion that 

 this deposit has been thrown by a fault is hardly worthy of con- 

 sideration ; though it is absolutely demanded if the extreme view 

 is held that the Dry Creek deposit is synchronous with the 

 Miocene, the nearest site to which is in the city of Adelaide, five 

 miles distant, at an elevation of 110 feet above sea-level. 



The above estimate of movement closely accords with those 

 founded on other data, namely, the extension of the Mammalifer- 

 ous Drift below sea-level, to which I have appealed as some war- 

 ranty for the opinion that elevation was a factor in climatic 

 change during the time when glaciers existed in the southern 

 part of Australia. The following quotation is significantly ap- 

 plicable : — " I am unacquainted with marine Pliocene beds in 

 South Australia, or even in Australia, .... .therefore the 

 marine equivalents to the Pliocene [Mammaliferous] Drift, if 

 extant, are submarine." Arguing on the lacustrine origin of the 

 Pliocene Drift, and its extension below sea-level, as evidence of 

 the depression of the land since then, reference is made to the 

 Pliocene Drift at Port Wakefield extending to 312 feet below 

 sea-level, and overlying Cambrian or Pre-Cambrian strata ; at 

 Port Augusta to 356 feet below sea-level (but the base not 

 reached). R. T., in Trans. Roy. Soc, S. Aust., vol. 



Appendix. 



Analysis of water from the Dry Creek-Bore. By Professor 

 Rennie, D.Sc, &c. 



In parts per 100 '000. 



Total solids dried at 1 80 deg. C 321 ' 



After ignition and restoration of carbonates ... 302-50 



Sodium 83-90 



Potassium ... ... ... ... ... ... 3-06 



Calcium 16-28 



Magnesium ... ... ... ... ... ... 10*85 



Iron .. .. -23 



Aluminium ... ... ... ... ... ... -21 



Silica (SiO J 2-7 



Chlorine 119-15 



Sulphuric acid (SO4) 48*45 



Phosphoric acid (PO4) ... ... ... ... nil 



Total carbon dioxide (CO 2) 40-00 



*(Free or semi-combined CO 2) 16-27 



Sulphurretted hydrogen (SH 2) -80 



* Calculated. 



These may conveniently be supposed to be combined as follows, 

 but it must be clearly understood that such combinations are to a 

 large extent arbitrary, there being no known method of ascer- 



