Parvaneh Roozbahani
Lithostratigraphy and biostratigraphy of Oligocene Miocene deposits (Asmari Formation) in south-west Iran (Zagros basin, northern Khorramabad)

Geo.Alp 8, 2011, p. 46–55

For the lithostratigraphic and biostratigraphic analysis of the Asmari Formation in south-west of Iran (northern Khorramabad), two geological sections, one in the Kakareza region and the other one in the eastern Makhkalkuh, were selected and sampled. It consists mainly of limestones, clayey limestones and sandy limestones. The Asmari Formation overlies the Shahbazan Formation with a paraconformity and underlies conformably the Gachsaran Formation. Based on micropalaeontologic research 40 genera and 19 species of benthic foraminifera, 3 genera and 2 species of pelagic foraminifera and 4 genera of calcareous algae (accompanied by a number of non-foraminifera) have been identified indicating a Burdigalian age for the sections under study. Based on the associated index foraminifera the Borelis melo curdica - Meandropsina iranica - Schlumbergerina assemblage zone has been selected. This biozone is comparable with the biozone NO. 1 of Adams & Bourgeois (1967) and biozone NO.61 of Wynd (1965). The Borelis melo curdica - Meandropsina iranica - Schlumbergerina assemblage zone is also considered to be equivalent to the biozone which was reported from the Upper Asmari Formation by Thomas (1948,1949).

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