lithostratigraphy and biostratigraphy Studies of Eocene sediments of Halegan well of folded Zagros

In order to study and inspect of biostratigraphy and lithostratigraphy of Eocene sediments of Halegan well in folded zagros 100 thin microscopic sections of this well’s samples was studied. Mentioned studies caused to recognize 12 genus and 25 species of Planktonic foraminifera. According to spread stratigraphy planktonic foraminifera 3 Biozone (P6, P13, P16/P17) that separated and introduced for Eocene sediments in this well by D.Verga & R.Rettori (2003). Subsurface of section stratigraphy is compared with wynd Biozons (wynd,1965). According to recognized and separated biozons, Wynd biozonation is included 45, 47, 50. In this essay Pabdeh formation in Halegan well was introduced and compared both D,Verga & R.Rettori (2003) and Wynd (1965) Biozone. Results of comparison reveals that the best zonation for Pabdeh formation in Halegan well is D.Verga & R.Rettori (2003) Biozone.Pabdeh formathion is included a sequence of shale, marl, argillaceous limestone layers and their colors are usually gray, withe-brown in Halegan well. Pabdeh formation had been formed high depth of sea. It is an evidence for depth of zone in this area in Eocene period. According to this studies it seems Halegan well had been full of water in Eocene period the most onlap of sea had been in this period.