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The First 40 Million Years of Jurassic Planktonic Foraminifera
Version 1
: Received: 10 December 2020 / Approved: 14 December 2020 / Online: 14 December 2020 (09:50:00 CET)
A peer-reviewed article of this Preprint also exists.
Gradstein, F.; Waskowska, A.; Glinskikh, L. The First 40 Million Years of Planktonic Foraminifera. Geosciences 2021, 11, 85. Gradstein, F.; Waskowska, A.; Glinskikh, L. The First 40 Million Years of Planktonic Foraminifera. Geosciences 2021, 11, 85.
Abstract
We provide a biochronology of Jurassic planktonic foramininfera, using first order linkage to ammonite and nannofossil stratigraphy and geochronology. This enigmatic and understudied group of microfossils occurred from middle Toarcian through Tithonian time, from ~180 to ~143 Ma; its origin is unknown. There are three genera: Globuligerina, Conoglobigerina and Petaloglobigerina. The genus Globuligerina, with a smooth to pustulose test surface texture appeared in Toarcian (late Early Jurassic) and Conoglobigerina, with a rough reticulate test surface texture in Oxfordian (early Late Jurassic) time. The genus Petaloglobigerina, with a petaloid last whorl and one or more twisted and claviform chambers evolved in early Kimmeridgian time from Globuligerina balakhmatovae. We recognize stratigraphic events from eleven species across four evolutionary lineages, calibrated to Geologic Time Scale 2020. A dramatic faunal change over, which is not well documented led to the survival of only one taxon, most likely Gobuligerina oxfordiana in the Tithonian. During the Berriasian several new taxa appeared.
Keywords
planktonic foraminifera; Jurassic; evolution; biochronology
Subject
Environmental and Earth Sciences, Atmospheric Science and Meteorology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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