M Mannani; M Yazdi
Abstract
The Nayband Formation in North of Isfahan includesfive Members: 1- Gelkan Member (marl and sandstone), 2- Bidestan Member (sandstone and reefal limestone), 3- Howz- e- Sheikh Member (marl and sandstone), 4- Howz- e- Khan Member (marl and reefal Limestone) and 5- Qadir Member (marl and sandstone). The ...
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The Nayband Formation in North of Isfahan includesfive Members: 1- Gelkan Member (marl and sandstone), 2- Bidestan Member (sandstone and reefal limestone), 3- Howz- e- Sheikh Member (marl and sandstone), 4- Howz- e- Khan Member (marl and reefal Limestone) and 5- Qadir Member (marl and sandstone). The biostromal limestones of Bidestan and Howz-e- Khan Members represent a typical known key bed in North of Isfahan. In Bidestan and Howz-e- Khan Members (Nayband Formation), coral reefs grow up and their distribution are significant in the biostromal limestone of Bidestan and Howz-e- Khan Members of Nayband Formation.Twelve genera and 31 species of Scleractinian corals were recognized in the sereefal members. They included: Reimani phylliidae, Margarophylliidae, Coryphylliidae, Cyclophyllidae, Astraeomorphidae, Pamiroseriidae, Stylophyllidae and Actinastraeidae families. According to the field observations and evidences, laboratory studies and analysis, measurements of the coral size and the destroyed epitecha of the corals, it could beguessed that Scleractinian corals survive below the storm wave base (about 20 meters depth) but they tolerated many storms. Morphology of Scleractinian corals of Late Triassic sea (North of Isfahan) indicates in adequate living conditions and high energy environment. Corals have major role in reconstruction of Paleoenviroment of the Late Triassic units of the North of Isfahan (Nayband Formation) in Dizlu section.
