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South African Journal of Geology; December 2007; v. 110; no. 4; p. 647-653; DOI: 10.2113/gssajg.110.4.647
© 2007 Geological Society of South Africa
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Article

The Aliwal Shoal revisited: New age constraints from nannofossil assemblages

Charl Bosman and Ron Uken

Joint Council for Geoscience / University of KwaZulu-Natal Marine Geoscience Unit C/o School of Geological Sciences, University of KwaZulu-Natal, Durban, 4041, RSA, e-mail: bosman{at}ukzn.ac.za; uken{at}ukzn.ac.za

Maria N. Ovechkina

Joint Council for Geoscience / University of KwaZulu-Natal Marine Geoscience Unit C/o School of Geological Sciences, University of KwaZulu-Natal, Durban, 4041, RSA Palaeontological Institute, Russian Academy of Sciences, Moscow, e-mail: movechkina{at}mail.ru

Nannofossil assemblages extracted from rock samples collected at depths of between 33 and 15 metres on the Aliwal Shoal, a submerged aeolianite and beachrock complex on the southeast African continental shelf, indicate a late Middle Pleistocene to Holocene (calcareous nannofossil zone NN21) age for both the aeolianite core and younger abutting beachrocks. This indicates that the older aeolianite core, forming the dune ridge, is no older than ~290 000 years BP. The presence of reworked Cretaceous (Campanian to Maastrichtian), Palaeogene and Pliocene forms in younger beachrocks suggests periodic exposure of those sequences on the outer shelf. The most recent sea level lowstand at approximately –125 m during the Last Glacial Maximum (~18 000 years BP) is considered the most likely event releasing these older forms and their subsequent incorporation into the beachrocks during the ensuing post-Last Glacial transgression.






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