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Integrated biostratigraphy across the Eocene/Oligocene boundary at Noroña, Cuba, and the question of the extinction of orthophragminids

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Integrated biostratigraphy by means of planktic foraminifera, calcareous nannofossils and larger benthic foraminifera from a continuous marine section at Noroña (Cuba) suggests that the extinction of orthophragminids lies in the Rupelian (early Oligocene). Three levels containing larger benthic foraminifera are found in the lower and middle part of the planktic foraminiferal Zone O1(P18) and in the middle part of the calcareous nannofossil Zone NP21(CP16) (Rupelian). Furthermore, a traditional larger foraminifera Eocene marker, Fallotella cookei, is abundant in the Oligocene at the Noroña section, consistent with data reported from lower Oligocene sediments from Cuba, Florida and Jamaica. In order to solve the question of the orthophragminid extinction, which has been shown in some places to coincide with the Eocene/Oligocene boundary, data from the Noroña section are discussed in the view of the presence of these larger benthic foraminifera in lower Oligocene strata in other sections world wide. Our data from Noroña, as well as those from other previously studied sections, suggest that the extinction of the orthophragminids could be diachronous, with disappearances near the Eocene/Oligocene boundary in the low latitudes of the Indo-Pacific region (e. g., Tanzania) as opposed to the Rupelian in the low latitudes of the Caribbean-American bioprovince (e. g. Cuba and Jamaica) and in the middle latitudes of the Tethys (e. g., Italy and Spain).
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Keywords: CALCAREOUS NANNOFOSSILS; CUBA; EOCENE/OLIGOCENE; LARGER FORAMINIFERA; PLANKTIC FORAMINIFERA

Document Type: Research Article

Publication date: 01 January 2016

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  • Newsletters on Stratigraphy is an international, peer-reviewed journal with a focus on stratigraphic issues that are relevant for a broad geoscientific community. Papers published in Newsletters on Stratigraphy use (and ideally integrate) stratigraphic methodologies from a wide field of disciplines, including (but not limited to) biostratigraphy, chronostratigraphy, chemostratigraphy, and magnetostratigraphy.

    The results have implications for paleogeographic reconstructions, paleoceanography, paleoclimate, biotic evolution, basin development, or regional and supraregional correlation.

    Papers published in Newsletters on Stratigraphy comprise original research articles, background information on ongoing work of e.g., the International Stratigraphic Commission (ICS) and the International Subcommission on Stratigraphic Classification (ISSC), and review articles. There are no page charges for the publication of regular papers.
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