Tertiary Fossils. 



227 



bed. In fact, this tlieory of the presence of faults along this par- 

 ticular trend line is supported bv the parallel system of fractures 

 re-entrant along the coast, stepped in the same direction from the 

 Head of the Bight to Anxious Bay, and even bevond. 









,4 









lo"' <-• 



O vdf- 





^4 



5ft.if LA5«».»a 



Ter t-i a-ry 



QT-ll^cool-ro 



r\o<Mr>-<e Rock 



t^^la.ry 



Fig. 1. Sketch Map of South Australian area inchidin^ Fowler's Bay ancF 

 the Ooldea Soak. M.iin details taken from the geological map of South 

 Australia, by H. Y. L. Brown, 18U9. 



This shows the trend, in a north-westerly and south-easterly direction, of 

 probable fracture zones, involving the Miocene and Pleistocene rocks. The 

 direction of sand-ridges are also seen to be influenced by the underlying- 

 structure, since, as Mr. Henry Deaue, M.A., informs me, they generally run in 

 a similar way. These fracture lines would also appear to have a considerable- 

 bearing on the disposition of water holes, lagoons and soaks in this part of the 

 country. 



Areas in this map marked Granite may also include Metamorphic rocks, as- 

 Gneiss, Hornblende and Mii a Schists ; also Diabase dykes and mineral veins. 



The Older Tertiary can be referred to the Miocene, to which the older 

 fossiliferous beds of the Ooldea Soak belong. 



The late Tertiary includes the Older Pleistocene of the Ooldea Soak and all 

 siib.sequent stages, as Sand-dune rock and Concretionary limestone. 



12 



