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Title: Danian-Selandian sea-level change and biotic excursion on the southern Tethyan margin (Egypt)
Authors: Speijer, Robert
Issue Date: 2003
Publisher: The Geological Society of America
Host Document: Causes and Consequences of Globally Warm Climates in the Early Paleogene pages:275-290
Conference: International conference on Climate and Biota of the Early Paleogene location:Powell, Wyoming date:3-8 July 2001
Abstract: A study on Danian to Selandian foraminifera (planktic/benthic ratios, benthic assemblages) in 23 sections on a N-S transect in eastern Egypt documents a transient biotic excursion associated with sea-level fluctuation at ∼60.5 Ma (Subbiochron P3a). In southern areas, the inner to middle neritic (30–70 m) Neoeponides duwi assemblage expanded into deeper parts of the shelf (∼70–250 m), temporarily replacing the Anomalinoides umboniferus and Angulogavelinella avnimelechi assemblages. In the deeper parts of the basin (∼400–600 m) in the northern part of the transect, the Gavelinella beccariiformis assemblage appears to have been persistent throughout the studied time interval. Biofacial and sedimentologic data suggest a relative sea-level fluctuation, possibly with an amplitude of 50–100 m, which may correlate with a eustatic sea-level cycle during the Danian-Selandian transition. During early sea-level rise, total organic carbon–enriched, partially laminated sediments, containing abundant fish-remains and planktic foraminifera (>99.5% planktics), were deposited, reflecting oxygen deficiency at the seafloor. The patterns of biotic and sea-level change at the Danian-Selandian transition strongly resemble those across the Paleocene-Eocene Thermal Maximum in the same basin, suggesting similar operative processes. Considering the close coincidence with a recently postulated brief period of oceanic warming at 60.5 Ma, the question arises whether the observed patterns in Egypt could in part be related to a global warming event, similar to the Paleocene-Eocene Thermal Maximum.
Publication status: published
KU Leuven publication type: IHb
Appears in Collections:Division of Geology

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