25 



Variety Bat. 



The Variety Bay is a small indentation in the mudstone 

 rocks a little north of Cape Frederick Henry. The cliffs 

 here are typical of the whole series from Trumpeter Bay to 

 Adventure Bay. Unlike the mudstone rocks at One-Tree 

 Point the whole series are richly fossiliferous, like the lower 

 beds at Porter Hill. 



The following is a description of the section on the southern 

 side of the hay taken in ascending order : — 



1. Greenstone. 



2. Hard conglomerates and grits without fossils 



3. Siliceous limestones and mudstones with occasional 



casts of Pleurotomaria Morrisiana 



4. ■ Hard, dense siliceous rock, replete with thin layers 



almost wholly composed of the casts of Pleurotomaria 

 Morrisiana, ... 



5. Silicious limestones with casts of Spirifera convoluta ; 



S. Strzelechi ; Terebratula sacculus ; Aviculo-pecten 

 limceformis, A. Fittoni, etc. 



6. Mudstones finely laminated by the abundance of Fenes- 



tella jossula and Protoretepora ampla ; together with 

 other common forms 



Feet. 

 4 



10 



4 



12 



70 



100 



20deg. 



These beds also dip at an angle of about 15deg. to 

 to the west. 



The beds regularly flank against the greenstone or overlie 

 it, without disturbing the dip or disarranging the characteristic 

 sequence of the several zones. This is also the general 

 character of the relation of the fossil mudstones with the 

 greenstone base from Blackmans Bay to Adventure Bay, a 

 distance of over 20 miles. No one who studies these sections 

 closely can easily arrive at any other conclusion than that the 

 mudstone rocks are younger than the greenstone axis which 

 they either abut against or overlie. It is upon such evidences 

 as these that I have formed my opinions respecting the age of 

 the Mount Wellington greenstones and its lateral spurs, and 

 not upon the mere evidence of the bore test at the Cascades, 

 although I regard the latter as favourable to the views which 

 I am inclined to take at present. 



I am not surprised that my friend, Mr. Stephens, should 

 express such confidence in assigning a more recent date to the 

 greenstones of Mount Wellington when he has succeded in 

 satisfying himself that the presence of pyrites and calcite in 

 the overlying mudstones and limestones can only be due to 

 the supposed intrusion of a mass of greenstone which has 

 been proved not to have penetrated within 519 feet of the 

 present surface of these greatly denuded mudstones. 



Greikie, who is no mean authority, states that layers of 



