Library Open Repository

Notes on the geology and geomorphology of De Witt Island, southwest Tasmania

Downloads

Downloads per month over past year

Dixon, G and Houshold, I (1996) Notes on the geology and geomorphology of De Witt Island, southwest Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 130 (1). pp. 67-74. ISSN 0080-4703

[img]
Preview
PDF
1996-Dixon-geology.pdf | Download (374kB)
Available under University of Tasmania Standard License.

Abstract

De Witt Island, off the south coast of Tasmania, is composed of a folded succession of turbiditic silstone, sandstone and conglemerate, at least 450 m thick. It is probably a correlate of the Mid to Upper Cambrian Ironbound Group. Folds are upright, open to tight and at least two generations are indicated. The broad-scale geomorphology of the island is controlled by the direction of storm waves which have eroded nearly vertical cliffs up to 340 m high on the south shore. Many sea caves are found at the base of the cliffs, particularly on the west and south coasts. Cliff retreat has progressively captured the headwaters of the island's two perennial streams. Fluvial processes, controlled by both lithology and structure, but also showing possible influence from interglacial and glacial stages, have shaped the interior of the island for a long period. Aeolian processes have deposited sand sheets in the island's central basin. Some well-developed pseudokarst systems, including sinkholes, caves, underground drainage and airflows, are related to large rotational slumps on the island's south coast.

Item Type: Article
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
Page Range: pp. 67-74
ISSN: 0080-4703
Additional Information: Copyright Royal Society of Tasmania
Date Deposited: 22 May 2012 04:15
Last Modified: 18 Nov 2014 04:33
URI: http://eprints.utas.edu.au/id/eprint/13663
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page