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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 3, issue 2
J. Micropalaeontol., 3, 19, 1984
https://doi.org/10.1144/jm.3.2.35
© Author(s) 1984. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 3, 19, 1984
https://doi.org/10.1144/jm.3.2.35
© Author(s) 1984. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Sep 1984

01 Sep 1984

Observations on Upper Devonian acritarch communities from the southern Bergisches Land (Rhenish Massive)

Ulrich Jux Ulrich Jux
  • Department of Geology, University of Cologne, Zülpicher Straße 49, D-5000 Köln, F.R.G

Abstract. In the southern Bergisches Land the Upper Devonian sequence (Frasnian and Lower Famennian) consists mainly of shales, marls and bituminous limestones together with an intercalated biostrome. The acritarch communities identified from these rocks are essentially characterised by members of the Micrhystridium-Veryhachium group.

Sections through the vesicle of Micrhystridium vulgare Stockm̂anns & Willière reveal a simple, dense wall structure, but in the living cyst an exchange of gases was achieved through fine axial canals in its slender spines.

Abundance and diversity of the acritarchs increased off-reef and reflect both the palaeogeography and the depth.

The stable environments on the open marine shelf favoured phytoplanktonic life and also the formation of source rocks for hydrocarbons.

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