Frasnian-Famennian extinction and the influence of the extinction on Rogosa corals on north-west Esfaraien

Abstract

Data obtained from the late Devonian corals in north-west of the Esfaraien research, show that these corals are under the influence of the late Frasnian mass extinction. Frasnian dissepimented corals which had high variety,   accidentally become extincted at the end of Frasnian and is replaced by new corals containing aulosese.The Frasnian sediments containing the  important species: Tabulophyllum mcconnelli Charactophyllum nanum, Disphyllum virgatum, Temnophyllum lapparanti Sinodisphyllum variable while the Famennian strata containing new species Meyghaniphyllum  shahroodiense, Alborziphyllum ferdowsiense. The abundance of famennian species in this region and reports disappear about other regions (Iran and other areas) can  be display different ecologic conditions of Famennian sea area in eastern  Alborz.