The Age and physiographical relationships of some Cainozoic basalts in Central and Eastern Tasmania

The problems associated with the determination of the age of the Cainozoic volcanic rocks of Tasmania are closely analogous to those presented by similar rocks in Victoria. In Tasmania, as in Victoria, certain volcanic rocks are known to be of pre-Lower Miocene age, while others are known to be post-Lower Miocene from their relationships with fossiliferous marine sediments (Nye and Blake, 1938, pp. 50-51).