TABLE III. SHOWING AMOUNT OF FINE MATERIAL IN THE SOIL AT DIFFERENT 

 DEPTHS ON EACH OF THE E W LINES OF BORES. 



The last column shows the number of bores on each line (see 

 Map). 



The above figures represent the average for each E-W line. In 

 ordinary Delta formation where the extention of land is produced 

 by deposition of alluvium in sea water one would expect to find the 

 finer material in the lower strata, since it is this material which would 

 be carried farthest out to sea and would therefore be deposited in 

 the deepest water. It may at first sccni somewhat strange that in this 

 area we have the coarser material at a depth of two to three metres 

 covered in the majority of cases by a layer of nearly two metres of 

 fine material. The explanation of this would appear to be somewhat 

 as follows. At the present time much of this area is covered with 

 water during flood and there is little doubt but that within com- 

 paratively recent times it must have formed a fresh water lake as is 

 shown by the vegetable remains found in the black soil at a depth 

 of two to three metres, i.e. below sea level. Before that time this 

 lake probably communicated with the sea just as some of the Northern 

 Lakes (Brullos, Menzala) do at the present time. If this communi- 



