Tertiaries in the Neighbourhood of Melbourne. 211 



Natica varians, Tate. 



Hipponyx antiquatus '?, Lamarck. 



Pyrainidella, sp. 



Leiopyrga quadricingulata, Tate. 



,, sayceana % Tate. 



Emarginula, sp. 

 Haliotis, n. sp. aff. H. nsevosoides, McCoy. 



21. Spring Creek. 



This small creek enters the Saltwater River between Braybrook 

 and Maribyrnong. It flows through plains capped by newer 

 volcanic rock, and has cut through this to the underlying form- 

 ations. On the quarter-sheet a fault is marked crossing it and 

 lowering the newer to the level of the old volcanic rock in the 

 creek bed. The upper volcanic, wherever it is visible in clitf 

 section in the neighbourhood, is seen to be formed by a very thin 

 flow, and to assume that after faulting the surface had been 

 planed down to its present level contour is hardly, we think, 

 justified. An examination of the locality induced us to form the 

 opinion that the appearance is due, not to faulting, but to the 

 presence of an old valley crossing the present one obliquely. 

 This old valley subsequently became filled with lava which 

 formed the plain. The fossils found were indeterminate. 



22. Green Gully, Keilor. 



The beds in this pretty little glen are indicated on the quarter- 

 sheet and have been briefly alluded to by Mr. Graham Officer 

 (14). Anex'oid measurement shows that the depth of the valley 

 where the road crosses it is about 130ft. The section here is 

 approximately as follows, the thickness of the individual beds 

 being estimated :— 



Newer volcanic rock - - - 20 feet. 



Quartzites and grits - - 25 ,, 



Ferruginous grits (fossiliferous) - 20 ,, 



Older volcanic - - - - 65 „ 



130 feet. 



