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Senckenbergiana lethaea

, Volume 80, Issue 1, pp 39–44 | Cite as

Biostratigraphy of the Baba Heydar section, Iran

  • Bohumil Hamrsmid
  • Fred Rögl
Article

Abstract

A section of pelagic limestones and marls of the Pabdeh Formation, containing vertebrate remains was investigated for calcareous nannoplankton and planktic foraminifera. It is located in the Zagros Mountains near the town Baba Heydar, Iran. The microfossils of the marls are indicative for an eutrophication in the photic zone of the sea with the bloom of r-strategists of calcareous nannoplankton. Planktic foraminifera are abundant and compare with assemblages of Tanzania and the Caucasus. The benthic foraminifera are of Midway type assemblages at a deposition depth of upper bathyal. Biostratigraphically the sequence belongs to nannoplankton zone NP 24 or planktic foraminifera zone P 20, upper Rupelian.

Key words

Biostratigraphy calcareous nannoplankton planktic foraminifera Oligocene Rupelian Pabdeh Formation Zagros Mountains Iran 

Biostratigraphie des Baba Heydar-Profils, Iran

Kurzfassung

Im Zagros Gebirge, nahe der Stadt Baba Heydar, im Iran wurde eine Abfolge mariner, pelagischer Kalke und Mergel biostratigraphisch untersucht. Die Schichtfolge gehört zur Pabdeh Formation und ist durch eine Fossilführung mit Fischen, Vögeln und Pflanzenresten interessant. Die untersuchten Proben unterhalb und oberhalb dieser Fossilreste zeigen ähnliche Mikrofossilvergesellschaftungen. Blooms von wenigen Arten kalkigen Nannoplanktons weisen auf eine Eutrophierung der obersten Wasserschichten hin. Die reiche Vergesellschaftung planktonischer Foraminiferen zeigt Beziehungen zum Unteroligozän von Tanzania und des Kaukasus. Die verhältnismäßig reiche benthische Foraminiferenfauna im tieferen Teil der Schichtfolge entspricht einer Ablagerungstiefe im oberen Bathyal. Biostratigraphisch gehört die Abfolge in das mittlere Oligozän (oberer Rüpel), Nannoplanktonzone NP 24, Zone der planktischen Foraminiferen P 20.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2000

Authors and Affiliations

  • Bohumil Hamrsmid
    • 1
  • Fred Rögl
    • 2
  1. 1.Moravske Naftove Doly30 HodonínCzech Republik
  2. 2.Naturhistorisches Museum WienWienAustria

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