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Journal Article

Cretaceous Calcareous Nannoplankton in South Africa

William G. Siesser
Journal of Paleontology
Vol. 56, No. 2 (Mar., 1982), pp. 335-350
Stable URL: https://www.jstor.org/stable/1304460
Page Count: 16

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Topics: Silts, Fossils, Biostratigraphy, Continental shelves, Specimens, Stratigraphy, Limestones, Plankton
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Cretaceous Calcareous Nannoplankton in South Africa
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Abstract

This is the first detailed biostratigraphic study of the Cretaceous System of South Africa using calcareous nannoplankton. Both onshore sections and continental margin samples have been investigated. Lower Cretaceous rocks are almost everywhere barren or contain only poorly preserved nannoplankton; many Upper Cretaceous samples, however, contain abundant, well-preserved nannoplankton. South African Cretaceous rocks have been assigned stratigraphic positions in terms of standard international stages. Most of the onshore sections containing nannoplankton are Campanian or Maastrichtian. A cool, inner-shelf environment of deposition during the Campanian-Maastrichtian is suggested. Known stratigraphic ranges of Russellia bukryi/Russellia laswelli Risatti, Ottavianus giannus Risatti and Lucianorhabdus scotus (Risatti) are extended downward into the lower Campanian.

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