vo 



HAEEFIELD, FINGAL BASIN. 



measures at Mount Cygnet, the following rocks are to be 

 met Witt in ascending order : — 



1. Felspar porphyries and associated metamorphic rocks. 



2. Dark-blue, friable, shaly mudstones of Upper Palaeozoic 



Age, quietly reposing upon the denuded surfaces of No. 

 1, dipping at an angle of 15deg. S.S.E. 



3. Spirifer zone* of the Upper Pal. marine beds succeeding 



No. 2 along the course of Gardner's Creek, same dip as 

 No. 3. 



4. Fenestella beds* succeeding No. 3, same dip as Nos. 2-13. 



5. Lower coal measures, succeeding No. 4, still bearing th& 



same angle of dip. 



The distance from No. 1 to No. 5 in a straight line may be 

 roughly estimated at about three miles. 



It will be seen, therefore, that the relation of the lower 

 coal measures to the marine beds at Mount Cygnet corre- 

 sponds closely to that of the Adventure Bay coal measures 

 immediately to the south, towards which they dip. 



* Species identical with the common forms at Variety Bay. 



HAEEFIELD, FINGAL BASIN. 



Under the direction of Mr. Bateman a trial bore by mean& 

 of the diamond drill was sunk recently at Harefield to a 

 depth of about 723 feet in search of coal seams. Sections of 

 this bore were submitted to the writer from time to time, 

 and from the evidence of contained plant impressions and 

 other fossils, it was clearly revealed that a thin deposit of the 

 lower coal measures existed below the marine beds of Upper 

 Palseozoic Age and directly reposing upon the common soft 

 clay states of the district of Upper Silurian Age. 



The following is an abstract of the principal rocks passed 

 through in this bore: — 



Mesozoic. 



Surface soil, black clay, and drift 



Sandstone 



Shale 



Sandstone 



Coal ... 



White band 



Coal ... 



Shale 



Sandstone, with thin coal Hakes.. 



Coarse sandstone 



ft. 



in 



3 







7 







16 



6 







8 



3 



6 







10 



1 



3 



2 



1 



12 



a 



17 



6 



