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Abstract

Tasmanian physiography is so closely connected with
the great occurrences of dolerite (diabase) that a correct
understanding of the one is essential for the deciphering of
the other. Every worker in geology in Tasmania has made
some contribution towards the elucidation of the problem,
and this paper merely carries our knowledge a little further.
The statements here contained are not proved; and await
further confirmation.
To summarise, then, the physical outline of Tasmania is
framed on blocks of country elevated to varying altitudes
and consisting of relatively soft sediments with sills of very
hard igneous rock intruded at various horizons. Previous to this elevation a definite topography had been eroded, the
igneous rock modifying this considerably, and this topography was elevated or not according to its position. In
the course of the elevation, again, the igneous rock modified
the lines of break, and after elevation it largely controlled
the rate of erosion. Subsequent to this elevation, the agents
of-erosion, chiefly frost, snow, and ice, on the highlands have
moulded the details of the landscape, and some slight faulting
has added a few features locally.

Item Type:	Article
Authors/Creators:	Lewis, Arndell Neil
Keywords:	Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title:	Papers and Proceedings of the Royal Society of Tasmania
ISSN:	0080-4703
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	Copyright Royal Society of Tasmania
Item Statistics:	View statistics for this item

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