185 



Clirome dlcdlage — Dundas. 

 Chromite — Dundas. 

 Olivine. 



As alteration products, or secondary minerals : — 

 Analcite — Prospect. 



5ary^es— Coating joint planes at Dundas. 

 Calcite — e.g., Dundas, where it encloses quartz., or 



may perhaps be replaced pseudomorphously by that 



mineral. 

 Ohrome- staining — e.g., at Bondi. 

 Common Salt — e.g., Dundas. 

 Epsoinite — e.g., Bondi. 

 Kaolin — decomposition product. 

 Frehnite — Prospect. 

 Quartz — e.g., Dundas. 

 Vivianite — Prospect. 

 Zeolites — e.g., Prelinite, Analcite, Prospect. 



These are very scarce. Fossils 



Plants. — Fragmentary plant remains, in particular the fossil 

 fern Tliinvfeldia may be found in many of the patches of shale 

 throughout the Series. G-ood specimens are sometimes found. 

 Stems occur in the tuffaceous beds at the top of the ISTarrabeen 

 Series at Long Eeef. 



Crustacea. — The minute Esllieria abounds in certain beds of 

 the Narrabeen Series which only can be reached by bores. 



Mollusca. — A very few specimens of TJnio, a bivalve shell 

 living in brackish water. They have been found- at Bowral, 

 Camperdown, and Pymble. Other mollusca have been found at 

 Cockatoo Island and Narrabeen. 



Fisli. — ^Abundant fish remains were found in the ballast quarry 

 at Gosford, and they are also found from time to time in the 

 clay pits at St. Peters. They belong to a class that is now almost 

 extinct, having an external scaly armour instead of an internal 

 bony skeleton like modern fish. (See page ISO.) 



