Boletín de la Sociedad Geológica Mexicana Volumen 75, núm. 3, A220623, 2023 http://dx.doi.org/10.18268/BSGM2023v75n3a220623

Invertebrate fauna of the Albian–Lower Cenomanian deposits in the Fars and Isfahan provinces (Firuzabad and Fasakhod sections), Zagros Basin, Central Iran

Fauna de invertebrados de los depósitos del Albiano-Cenomaniano Inferior en las provincias de Fars e Isfahan (secciones Firuzabad y Fasakhod), Cuenca de Zagros, Irán Central

Babak Sedghi¹, Ali Bahrami^1,*, Mehdi Yazdi¹, Francisco J. Vega²

¹ Department of Geology, Faculty of Sciences, University of Isfahan, 81746-73441, Isfahan, I.R. Iran.

²Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, 04510, CDMX, Mexico.

* Corresponding author: (A. Bahrami) This email address is being protected from spambots. You need JavaScript enabled to view it.

How to cite this article:

Sedghi, B., Bahrami, A., Yazdi, M., Vega, F.J., 2023, Invertebrate fauna of the Albian–lower Cenomanian deposits in the Fars and Isfahan provinces (Firuzabad and Fasakhod sections), Zagros Basin, Central Iran: Boletín de la Sociedad Geológica Mexicana, 75 (3), A220623. http://dx.doi.org/10.18268/BSGM2023v75n3a220623

Manuscript received: May 8, 2023; Corrected manuscript received: June 19, 2023; Manuscript accepted: June 21, 2023.

ABSTRACT

The Albian- Cenomanian deposits of the Kazhdumi Formation at Zagros Basin (Firuzabad section and Central Iran (Fasakhod section), represents a carbonate sedimentary succession and contain rich and diverse invertebrate macro fauna. Detailed studies on about 200 specimens of invertebrate macro fauna revealed from two stratigraphic intervals led to recognition of 5 species of gastropods; (Liopeplum? sp., Columbellina sp., Cryptaulax? sp., Turritella? sp., Pleurotomaria sp.), 3 species of ammonites; (Knemiceras duberterti, Sphenodiscus sp., Knemiceras persicum), 10 species of bivalves assemblages; (Ceratostreon flabellatum, Cardium? sp., Exogyra (Costagyra) olisiponensis, Neithea (Neithea) quinquecostata, Trigonia sp., Buchia? sp., Cardium? sp., Pseudogyra sp., Ontaria? sp., Nucula? sp., Pleuromia? sp., 1 species of echinoids; Dorocidaris taouzensis with a prolific horizon of Notopocorystes xizangensis of raninoid crabs. The absence of large gastropods and bivalves fauna and abundance of suspension-feeders indicated instability of the substrate, shallow marine paleoenvironment.and a medium energy condition.

Keywords: Cretaceous, Albian-Cenomanian, Kazhdumi Formation, fossil content, Iran.