Notes on the Geology of Bruni Island

Johnston, Robert Mackenzie 1886 , 'Notes on the Geology of Bruni Island' , Papers and Proceedings of the Royal Society of Tasmania , pp. 17-29 .

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Bruni Island is separated from the mainland of Southern
Tasmania by the tortuous course of D'Entrecasteaux
Channel. Its greatest length—north and south—from
Kelly's Point to Bruni Head is about 31 miles. Its breadth
is extremely variable. A mere strip of sand over seven miles
long divides Isthmus Bay on the western side from Adventure
Bay on the eastern side, and the same narrow neck forms the
junction between North Bruni and South Bruni. The
breadth of North Bruni varies from five to seven miles, and
the breadth of South Bruni varies from three to 10 1/2 miles.The characteristic vegetation is identical with that on the
neighbouring shores of the mainland.
doubt has not yet been wholly removed.
The dynamical forces which upheaved and dislocated the
stratified rocks on the flanks of our mountain chains operated
probably at different intervals during a long course of time. We should not assume that all movements of elevation are
immediately due to superficial intrusion of igneous rock.
Few mountain chains have been produced suddenly by cataclysms, and while I do not deny that cataclysms and
intrusive rocks have operated largely in producing important
modifications on the earth's surface, I am still inclined to
believe that the more important movements which have
resulted in raising stratified rocks to immense heights above
sea level, as on our mountain tiers, are often intermittent,
slow, and cover a vast period of time.
It is hoped that the information now produced with
respect to important
sections on the East Coast of North
Bruni may be of service in arriving at more satisfactory conclusions
in all matters to which they relate. I am only
anxious for the truth of my opinions, and therefore shall
always be prepared to modify them in accordance with the
weight of available evidence.

Item Type: Article
Authors/Creators:Johnston, Robert Mackenzie
Keywords: Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records
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:

In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.

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