Notes on the Geology of Bruni Island

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.