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Cretaceous Calcareous Nannoplankton in South Africa
William G. Siesser
Journal of Paleontology
Vol. 56, No. 2 (Mar., 1982), pp. 335-350
Published by: SEPM Society for Sedimentary Geology
Stable URL: https://www.jstor.org/stable/1304460
Page Count: 16
You can always find the topics here!Topics: Silts, Fossils, Biostratigraphy, Continental shelves, Specimens, Stratigraphy, Limestones, Plankton
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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.
Journal of Paleontology © 1982 SEPM Society for Sedimentary Geology