Presentation of a Rich fauna Athyrididae from the Late Devonian and Early Carboniferous North of Damghan (Jeyrud and Mobarak Formations)

Document Type : Original Research


1 Department of Geology, Faculty of Basic Sciences, Sciences & Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Geology, University of Isfahan, Isfahan, Iran


Athyrididae belong to one of the important Brachiopod groups, typical of Upper Devonian & Early Carboniferous sediments. This family has a world-wide diversification with many species. This study for the first time is on fossils of the Jeyrud and Mobarak Formations in Balast Mine (North East Railway Co.). The sediments have a rich fauna of Corals, Crinoids and other groups of Brachiopods. Compared with other sections in Iran, this section has the richest fauna of athyris. (Samples are in Azad University, branch of Izeh). According to this study we recognized.
- Athyris globolina (Waagn 1884).
- Cleiothyridina coloradensis (Girty 1900).
- Cleiothyridina coloradensis intermedia (Chao 1938).
- Cleiothyridina davidi (Chao 1938).
- Cleiothyridina kusbassica (Benznosova 1963).
- Cleiothyridina (Leiothycridina) okensis (Grunt 1980).
- Cleiothyridina orbicularis (Chao 1938).
- Cleiothyridina transversa (Stainbrook 1947).
- Cleiothyridina transversa geirudensis (Assereto 1962).
- Composita ambigua (Soworby 1839).
- Composita megala (Tolmacher 1924).