20 



tances, amounting to about 2,600 ft. 

 forth in the following Table : — 



These facts are set 



Local 



Surface 



Upper Limits of 



Cambrian 



Outlier. 



Level 



Eocene. 



Platform. 







Above 



Below 



Above 



Below 







sea level. 



sea level. 



sea level. 



sea level. 





Feet. 



Feet. 



Feet. 



Feet. 



Feet. 



1. Gawler 



415 



400 



— 



360 







2. Red Banks 



270 



230 



— 



210 



— 



3. Kent Town 



139 



12(2) 



— 



— 



221 



4. Croydon ... 



56 



— 



700 



— 



2,206 



5. Dry Creek 



16 



— 



(?) 



— 



(?) 



6. Smithfield... 





— 



(?) 





(?) 



Bores have been put down at Dry Creek and Smithfield. 

 In the first locality named, the bore penetrated to 410 ft., 

 and at that depth touched the base of a Pliocene marine 

 deposit. The same geological horizon was met with, at about 

 the same depth, in the Smithfield bore, and also in the 

 Croydon bore ; and although the sinking at Dry Creek and 

 Smithfield was not in either case carried down to bed-rock, it 

 seems probable that these bores are within the deeply-sunken 

 area revealed by the Croydon bore, and are shown in the 

 above Table for comparison. 



The chief points of interest in the observations now sub- 

 mitted are in extending the known area of the older Cainozoic 

 sea limits, and also in the additional evidence it affords of the 

 shelving-distribution of the remnants of these old marine 

 deposits consequent on the sinking of the gulf area by suc- 

 cessive steps. 



My acknowledgments are due to Mr. T. Nevin, late head 

 teacher of Mallala public school; Rev. C. E. Schafer, and 

 Mr. Marshman, for supplying interesting local information; 

 and to Mr. R. E. Stanley, an undergraduate at the Adelaide 

 University, for calling my attention to this outcrop. 



DESCRIPTION OF PLATE I. 



View of washout in Red Banks, River Light. The ledge on 

 which the bag and hammer rest is the upper limit of the 

 Cainozoic outcrop. 



(2) When Tate described the Kent Town section he had not 

 distinguished between the two lower marine series, but classed 

 them all as "Miocene." Guided by the nature of the material I 

 have assumed that, in Tate's section, the Miocene beds are in- 

 cluded from Nos. 13 to 16; an interval of erosion is repre- 

 sented by No. 17, and the Eocene from Nos. 18 to 24. The 

 upper limit of No. 18 is 12 ft. above sea-level. 



