Journal cover Journal topic
Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
Journal topic

Journal metrics

IF value: 1.179
IF1.179
IF 5-year value: 1.107
IF 5-year
1.107
CiteScore value: 2.6
CiteScore
2.6
SNIP value: 0.601
SNIP0.601
IPP value: 1.23
IPP1.23
SJR value: 0.491
SJR0.491
Scimago H <br class='widget-line-break'>index value: 27
Scimago H
index
27
h5-index value: 10
h5-index10
Volume 27, issue 1
J. Micropalaeontol., 27, 35–44, 2008
https://doi.org/10.1144/jm.27.1.35
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 27, 35–44, 2008
https://doi.org/10.1144/jm.27.1.35
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 May 2008

01 May 2008

Co-occurrence of the foraminifer Mohlerina basiliensis with Bacinella–Lithocodium oncoids: palaeoenvironmental and palaeoecological implications (Late Oxfordian, Swiss Jura)

Stéphanie Védrine Stéphanie Védrine
  • Department of Geosciences – Earth Sciences, University of Fribourg, Pérolles, 1700 Fribourg, Switzerland (Current address: School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK (e-mail: )

Keywords: benthic foraminifer, Bacinella–Lithocodium oncoids, carbonate platform, Late Oxfordian, Swiss Jura Mountains

Abstract. The stratigraphical and spatial distribution of the foraminifer Mohlerina basiliensis and Bacinella–Lithocodium oncoids was studied in the lagoonal deposits of the oncoid-rich Hauptmumienbank Member from the Swiss Jura Mountains (Late Oxfordian, NW Switzerland). Mohlerina basiliensis has a double-layered wall structure (thick outer hyaline-radial calcite layer with a lamellar structure and thin inner microgranular calcite layer) and is preferentially found in low-energy facies and associated with normal-marine bioclasts and Bacinella–Lithocodium oncoids. The distribution of Mohlerina basiliensis is relatively patchy. The ‘distal’ platform facies present a higher abundance and a more extensive stratigraphic occurrence of this foraminifer. The timing of the ecological evolution is given by the sequence- and cyclostratigraphic framework and illustrates the stepwise flooding of the platform. Bacinella–Lithocodium oncoids have diameters of a few millimetres to several centimetres and are composed of an alternation of Bacinella–Lithocodium meshwork and thin micritic laminae. They are found preferentially in low-energy facies (bioclastic wackestones) of open lagoons. The distribution of Bacinella–Lithocodium oncoids through time and space is also patchy; however, they appear more abundantly in ‘distal’ platform facies. This study reveals the co-occurrence of Mohlerina basiliensis and Bacinella–Lithocodium oncoids and thus suggests similar environmental conditions.

Publications Copernicus
Download
Citation