Art. Y. — Some Sections illustrating the Geological 

 Structure of the Country about Mornington. 



By T. S. hall, M.A., 



University of Melboiu-ne ; 



AND 



G. B. PRITCHARD, 



Lecturer in Geology in the Working Men's College, Melbourne. 



(With Plate lY.I 



[Eead 16th May, 1901. 



Previous Work. 



Dr. A. R. C. Selwyn, in 1854, (1) j(ave a sketch of the geology 

 of the Mornington Peninsula. He compares the blue clay series, 

 botli lithologically and as to fossils with the beds of the London 

 and Hampshire basins. The basalt of the coastal sections he 

 refers to dykes, a conclusion from which we dissent. The other 

 formations are described and compared with those of localities 

 outside the area under immediate discussion, a proceeding due to 

 the fact that he was as yet only at the beginning of his work iu 

 Victoria, and a rapid examination of the Castlemaine district 

 was almost all he had done. His coloured sections run from 

 Cape Schanck to Mount Martha, from Hawthorn to the Salt- 

 water River near Flemington, and a diagrammatic one illustrates 

 the position of the gold drifts, then a much debated question. 

 Another section, on a scale of about two miles to an inch, runs 

 from near Mornington to the Powlett River, while another is 

 drawn across the Yarra estuary, and is compiled from the results 

 of borings. Finally we have another — a diagrammatic one — 

 across the colony from the Grampians to the Alps. The coloured 

 map shows the the whole of the eastern side of Port Phillip, 

 from the Yarra mouth to the Heads and extending to the 

 eastward nearly as far as Cape Patterson ; the scale being two 

 miles to an inch. 



