Document Type : Final File


1 Department of Geology, Faculty of Science, University of Isfahan, 81746, Isfahan, Islamic Republic of Iran

2 Third Central Building, National Iranian Oil Company, Tehran, Islamic Republic of Iran

3 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran. Islamic Republic of Iran


The Lower Cretaceous Carbonate deposits of the Dariyan Formation of the High
Zagros Belt are mainly composed of thick to medium bedded limestone. These deposits
contain abundant and diversified benthic foraminifera which have been recovered from
carbonate rocks. A rich assemblage of microfossils with characteristic: Palorbitolina
lenticularis (Blumenbach), Mesorbitolina subconcava (Leymerie), Mesorbitolina texana
(Roemer), Mesorbitolina parva (Douglass) Pseudocyclammina hedbergi (Maync),
Archalveolina reicheli (de Castro), Praechrysalidina infracretacea Luperto Sinni,
Chofatella decipiens (Schlumberger), Debarina hahonerensis (Fourcade, Raoul et Vila),
Rumanoculina ponticuli (Neagu), Rumanoloculina pseudominima (Bartenstein et
Kovatcheva), Istriloculina cf. elliptica (Iovcheva) indicate paleoenviromental conditions
of shallow water carbonate sedimentation and Urgonian type facies. Based on
microfossils distribution and biozones identification in study sections, the age of the
Dariyan Formation is assigned late Barremian-early Albian. The microfossils
assemblages are regarded to be comparable with the Urgonian-type fauna known from
the peri-Mediterranean Tethys in the Barremian-Albian time interval.


Main Subjects

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