New method of investigation of bentic Foraminifera assembly across Paleocene - Eocene in north Schousf (Nehbandan), east of Iran

Bahramali A.

Geological Survey of Eastern Iran, Payamenoor University, Tehran, Iran

[e-mail]

In this Research I study the section that is exist in north of Schousf at southern Khorasn province. I collected totally 78 thin section at profile.

The longitude of my section is 60 18´-60 13´ Eastern and its latitude is 31 47´52˝-31 52´44˝. northern based on these analyses, from the bottom to up I have three Sequences in this section.

The layers from the 1-35^th belong to CHAH CHO CHO formation and 36^th-41^th layers belong to the formation that called ZIBRO and the formation that pertain to 42^th-48^th layer is DEBIL. we can equivalent the ZIBRO formation with DEBIL formation.

Base on its Microfacies (Foraminifera) at end 34 Genus and 24 Species and also identity 4 assemblage of foraminifera with Deltoid diagram:

1. First assembly have 20% Hyaline, 40% Porcellaneous & 40% Agglutinated. Include Fallotella alavensis, Haymanella paleocenica, Idalina sinjarica, Glomalveolina primaeva, Pseudolacazina donatae, Laffitteina bibensis, Periloculina sp., Cuvillierina sp., Miscellanea miscella, Broeckinella sp.,miliolids (Quinqueloculina sp., Triloculina sp. etc.), green algae,

Upper Paleocene

2. Second assembly have 80% Hyaline, 15% Porcellaneous & 5% Agglutinated. Include

Nummulites with small groupscontaining N. frassi, N. partchi and N. deserti, Assilina yvettae, Rotalia sp., Nummulites globulus, Nummulites convexa, Ranikothalia sindensis, Operculina exiliformis, Operculina patalensis, Miscellanea miscella, Miscellanea sp., Ranikothalia sp. (n. s), Smoutina sp.

Upper Paleocene

3. Third assembly have 10% Hyaline, 60% Porcellaneous & 30% Agglutinated. Include

Sistanites iranica, Idalina sinjarica, Quinquloculina sp., Globotextularia sp.,Valvulina sp. Pseudolacazina donatae. Upper Paleocene

4. Forth assembly have 20% Hyaline, 50% Porcellaneous & 30% Agglutinated. Include

Alveolina aff. decipiens, Alveolina aff leupoldi, Glomalveolina cf. primaeva Triloculina sp., Quinquloculina sp., Textularia sp. pseudolacazina sp. Lower Eocene

First Assemblage Second Assemblage

Third Assemblage Forth Assemblage

Fig. Paleoenvironment and locality of Foraminifera assemblage

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