Paleobiodiversity of Permian (Yakhtashian-Dzhulfian) small foraminifera in Abe-Garm, Gazvin section

Some paleobiodiversity indices such as total diversity, stand diversity, origination and extinction rates of Permian (Yakhtashian- Dzhulfian) small foraminifera were analyzed based from an outcrop in Abe-Garm area, Gazvin. Some important bizones that recognized by Taraz (1969), Taraz et al. (1981), Kobayashi (1997), Shabanian (2010), Stiger (1966), Davydov et al. (1996) were used for separation of stages, and biodiversity indices were calculated based on Foote (2000). The investigations are resulted in recognition of Two trends:1: Origination rate decrease rapidly from Yakhtashian to Murgabian and,2: two rapid increase in the extinction rate are recorded in Midian and Dzhulfian, the first comparable with End-Guadalopian mass extinction and the latter probably related to environmental condition.