Aspects of the emplacement, evolution and 14C chronology of ridges on a coastal spit, Groote Eylandt, Northern Australia

Shulmeister, J and Head, J (1993) Aspects of the emplacement, evolution and 14C chronology of ridges on a coastal spit, Groote Eylandt, Northern Australia. Marine Geology, 111 1-2: 159-169. doi:10.1016/0025-3227(93)90194-Z


Author Shulmeister, J
Head, J
Title Aspects of the emplacement, evolution and 14C chronology of ridges on a coastal spit, Groote Eylandt, Northern Australia
Journal name Marine Geology   Check publisher's open access policy
ISSN 0025-3227
Publication date 1993-01-01
Year available 1993
Sub-type Article (original research)
DOI 10.1016/0025-3227(93)90194-Z
Open Access Status Not yet assessed
Volume 111
Issue 1-2
Start page 159
End page 169
Total pages 11
Publisher ELSEVIER SCIENCE BV
Language eng
Subject 1906 Geochemistry and Petrology
1907 Geology
1908 Geophysics
Abstract A coastal spit on Groote Eylandt in the western Gulf of Carpentaria, Northern Australia, began to form between 3000 and 2000 yr B.P. in response to the migration of a large parabolic dune across the coastline. Systematic discrepancies in the 14C chronology and the remarkable preservation of fragile shelly material indicated a complex origin for a series of concentric "beach" ridges. One of the shell species deposited in the beach ridges (Clypeomorus bifasciata Sowerby) was being continuously incorporated through normal wave action while a second species (Fragum whitleyi Iredale) was introduced only under storm conditions. The importance of selecting a single shell species for 14C dating and understanding the environmental tolerance of the species is highlighted. A conceptual model for the emplacement of surficial ridge material under bedload flow during storm set-up is proposed. It is argued that these ridges act as offshore bars rather than storm beaches during storm events. This would have significant implications for the environmental interpretation of some types of spits and beach ridges. In particular, sea-level estimates based on the assumption that these types of ridges are formed as beaches, are open to question.
Keyword Geosciences, Multidisciplinary
Oceanography
Geology
Oceanography
GEOSCIENCES, MULTIDISCIPLINARY
OCEANOGRAPHY
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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