The Mobarak Formation is near the town of Kiyasar in the south‐east of Sari city, northern Iran. This formation conformably overlies the Geirud Formation (Upper Devonian). The lower part of the Mobarak Formation consisting of shales and thin‐ to medium‐bedded limestone toward the top of these sequences changes into alternations of dark limestone and interbedded gray to black shales. Weathered yellow thick‐bedded shales are observed at the top of the section. This formation is covered unconformably by sandstones attributed to the Dorud Formation (Lower Permian). The thickness of the formation in this region is 250 m. Four rock units have been recognized in this section. Foraminiferal biostratigraphy shows that the age of the Mobarak Formation in the Kiaysar region ranges from Lower Tournaisian to Early Middle Visean. The foraminifer Zones FAZ1 and FAZ2 are correlated with the Lower Tournaisian and Upper Tournaisian, whereas Zones FAZ3 and FAZ4 correlate with the Visean. Affinities exist between specimens recorded in the Kiyasar section with species known from other regions in eastern and Central Alborz, but there are important differences in their appearance.
-Corals from the middle part of the Mobarak Formation, exposed in the Kiyasar area of northern Iran, were examined for descriptions, age determination and indications of the paleoenvironment. New genera for the families Adamanophyllidae and Clisiophyllidae/ Amygdalophyllinae were established and three new species were described for the Bifossularia, Clisiophyllum and Spirophyllum genera. The age of studied corals is generally consistent with the early-middle Visean as previously was determined based on foraminifera. The absence of colonial rugose and syringoporid is a notable feature of these coral communities.Key words: Rugosa, Tabulata, Visean, Mobarak Formation, Iran.RESUMO -Corais da porção média da Formação Mobarak, afl orante na região de Kiyasar, norte do Irã, foram estudados sob o aspecto taxonômico e visando também datações e caracterizações paleoambientais. Novos gêneros para as familias Adamanophyllidae e Clisiophyllidae/Amygdalophyllinae foram propostas e três novos espécies foram descritas para os gêneros Bifossularia, Clisiophyllum e Spirophyllum. A composição de corais estudados é consistente com a idade eo-meso viseana proposta com base em foraminíferos. A ausência de rugosos coloniais e syringoporídeos é uma característica importante destas comunidades de corais.
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