Antarctic Science



Paper—Earth Sciences and Glaciology

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


David J. Cantrill a1
a1 British Antarctic Survey, Natural Environment Research Council, Madingley Road, High Cross, Cambridge, CB3 0ET, UK

Article author query
cantrill d   [PubMed][Google Scholar] 

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.

(Received June 14 1999)
(Accepted December 10 1999)


Key Words: Antarctica; Jurassic; macroflora; South Orkney Islands.


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