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A new macroflora from the South Orkney Islands, Antarctica: evidence of an Early to Middle Jurassic age for the Powell Island Conglomerate

Published online by Cambridge University Press:  06 May 2004

David J. Cantrill
David J. Cantrill
Affiliation:
British Antarctic Survey, Natural Environment Research Council, Madingley Road, High Cross, Cambridge, CB3 0ET, UK
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Abstract

A macroflora from John Peaks, Powell Island, contains Sagenopteris nilssoniana, Cladophlebis oblonga, Brachyphyllum sp., Elatocladus confertus, and Sphenopteris sp. The macroflora is best correlated with the Botany Bay Group flora, suggesting an Early to Middle Jurassic age for the Powell Island Conglomerate. This age supports new interpretations for the geological evolution of the Antarctic Peninsula that suggest the initial phase of Gondwana break-up was manifested as small rift grabens with continental deposits.

Keywords

AntarcticaJurassicmacrofloraSouth Orkney Islands
Type
Paper—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 12 , Issue 2 , June 2000 , pp. 185 - 195
Copyright
© Antarctic Science Ltd 2000

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