TY - JOUR ID - 55443 TI - Lithostratigraphy and Biostratigraphy of the Dalichai Formation (Middle Jurassic) in Parvar Area, North of Semnan, Central Alborz JO - Scientific Quarterly Journal of Geosciences JA - GSJ LA - en SN - 1023-7429 AU - Shams, M. AU - Seyed-Emami, K. AD - School of Geology , University College of Science , University of Tehran, Tehran, Iran AD - School of Mining Engineering, University Collage of Engineering, University of Tehran, Tehran, Iran Y1 - 2010 PY - 2010 VL - 19 IS - 75 SP - 89 EP - 94 KW - Lithostratigraphy KW - Biostratigraphy KW - Dalichai Formation KW - Ammonite KW - Middle Jurassic KW - Parvar KW - Central Alborz DO - 10.22071/gsj.2010.55443 N2 - The Dalichai Formation and its ammonite fauna is studied for the first time in the Parvar area, Central Alborz. At Parvar the Dalichai Formation, with a thickness of about 70 m, consist of an alternation of grayish silty marls, marlstones, marly limestone and limestone and is subdivided into 5 members. A rich ammonite fauna (407 specimens) have been collected from the member 4 and 5, comprising the following families: Phylloceratidae, Lytoceratidae, Oppeliidae, Haploceratidae, Sphaeroceratidae, Parkinsoniidae, Morphoceratidae and Perisphinctidae. These indicate a Late Bajocian and Bathonian age. Member five consists of greenish to reddish, nodular and flaggy limestones and is a typical condensed horizon. UR - http://www.gsjournal.ir/article_55443.html L1 - http://www.gsjournal.ir/article_55443_6e44e405d3880524f0ef619241e92848.pdf ER -