Vol. XXXIV., Plate XLV. 



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Photo, by W. Howchin. ~* 



Two miscroscopic sections of the Finniss River sand- 

 stone, showing the sharp and angular forms of the grains. 

 The finer material is of the same kind, and has the features 

 of a glacial '"rock- flour.'' Magnified 18 diameters. 



Hussey & Gillingham, Printers, Adelaide 



