"Palynological analysis of thirty-four upper Paleocene to lower Oligocene samples from Holes 959A and 959D of the Cote d’lvoire-Ghana Transform Margin (Leg 159) yielded a rich assemblage of spores and pollen (sporomorphs), marine phytoplankton (dinoflagellate cysts, acritarchs) and microforaminiferal test linings. This passive margin interval was characterized by biosiliceous sedimentation (chert, porcellanite, diatomite) in a deep bathyal, sub-carbonate compensation depth environment. The sporomorph palynoflora consists of 355 taxa, comprising 59 lycophytic and pteridophytic spore species, 10 conifer species, and 286 gymnosperm and angiosperm pollen species. Although the assemblage is dominated by single specimens of dicotyledonous angiosperm pollen, it also contains high counts of inaperturate gymnosperms, indicating a dense, broad-leaved, tropical lowland, continental vegetation cover beyond the coastline, on the West African continent adjacent to the depositional site. In addition, the presence of palm pollen, brackish-water acritarchs, sculptured dicellate fungal spores, wood debris, fresh-water algae, and the paucity of Schizaeaceous fern spores in the samples, suggest a coastal, low- energy environment. The assemblages of coastal and continental plant taxa, in addition to the marine phytoplankton, reflect changing successions of paleovegetation communities, indicating changes in local paleoclimatic and depositional conditions. The presence of key Early Oligocene biomarkers made it possible to assign a precise age for this interval, while other biostratigraphically and ecologically important palynomorph taxa have helped refine the Early-Middle Eocene and the Middle-Late Eocene boundaries in the core sections. With the exception of the Middle Eocene and Early Oligocene, palynostratigraphic zonations were not erected for the entire studied interval, because of the spotty occurrences of marker species"--Abstract, page iv.
Gregg, Jay M.
Mattox, Douglas M.
Geosciences and Geological and Petroleum Engineering
M.S. in Geology and Geophysics
University of Missouri--Rolla
viii, 211 pages
Gulf of Guinea
© 2000 Sarah Renée de la Rue, All rights reserved.
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de la Rue, Sarah Renée, "Late Paleocene-Early Oligocene palynomorphs from the Côte d'Ivoire-Ghana Transform Margin, eastern Equatorial Altantic: Biostratigraphic and paleoenvironmental significance" (2000). Masters Theses. 1936.
Fig. 9 Presence/absence distribution diagram for terrestrial and marine palynomorphs in the Late Paleocene to Early Oligocene stratigraphic interval at Site 959
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