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Age and environment of Miocene-Pliocene glaciomarine deposits, James Ross Island, Antarctica

H. A. Jonkers, J. M. Lirio, R. A. Del Valle and S. P. Kelley
Age and environment of Miocene-Pliocene glaciomarine deposits, James Ross Island, Antarctica
Geological Magazine (September 2002) 139 (5): 577-594

Abstract

Knowledge of the late Miocene-Pliocene climate of West Antarctica, recorded by sedimentary units within the James Ross Island Volcanic Group, is still fragmentary. Late Miocene glacio-marine deposits at the base of the group in eastern James Ross Island (Hobbs Glacier Formation) and late Pliocene (3 Ma) interglacial strata and its local top on Cockburn Island (Cockburn Island Formation) have been studied extensively, but other Neogene sedimentary rocks on James Ross Island have thus far not been considered in great detail. This paper documents two further occurrences of glaciomarine strata, included in an expanded Hobbs Glacier Formation, which demonstrate the stratigraphic complexity of the James Ross Island Volcanic Group. Benthic foraminiferal index species of the genus Ammoelphidiella are presented along with bivalves Macrofaunal and foraminiferal biofacies of glaciomarine and interglacial deposits share many similarities, which suggests that temperature is not the dominant factor in the distribution of late Neogene Antarctic biota. (modified journ. abstr.)


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 139
Serial Issue: 5
Title: Age and environment of Miocene-Pliocene glaciomarine deposits, James Ross Island, Antarctica
Affiliation: British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom
Pages: 577-594
Published: 200209
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 64
Accession Number: 2003-025966
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 1 table, geol. sketch map
S64°30'00" - S63°40'00", W59°00'00" - W57°00'00"
Secondary Affiliation: Instituto Antartico Argentino, ARG, ArgentinaOpen University, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200309
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