H Seif; M Majidifard; T Mohtat
Abstract
The Farrokhi formation in 15 km southwest of Khur with a thickness of up to 117m consists of marl and limestone with Maastrichtian age. In this section, the Farrokhi formation disconformably overlies the Haftoman formation below and the Chupanan formation above. In the present study, 87 genera and 103 ...
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The Farrokhi formation in 15 km southwest of Khur with a thickness of up to 117m consists of marl and limestone with Maastrichtian age. In this section, the Farrokhi formation disconformably overlies the Haftoman formation below and the Chupanan formation above. In the present study, 87 genera and 103 species have been recognized. Based on foraminifera, the Farrokhi formation ranges from the Maastrichtian and 3 biozones in the rock unit 1 of the formation have been recognized: (1) Contusotruncana contuse Partial range zone (CF6), indexing Early Maastrichtian.(2) Pseudotextularia intermedia Partial range zone (CF5), index for late Early Maastrichtian index and (3) Racemiguembelin fructicosa Taxon Range Zone (CF4), an index for early Late maastrichtian. The Farrokhi formation can be subdivided into four rock units which are composed of marl and marly limestone. In addition, the Farrokhi formation fauna contains ostracods and high abundance of invertebrate as diverse species of brachiopods, echinoderms and bivalves with rare fragments of ammonites. The K/Pg boundary is in this section paraconform and can be compared with boundary of the Farrokhi and Chupanan formations. The evidence of paraconformity is a gap of Early Paleocene and changes in lithfacies. The Farrokhi formation is carbonate and it is parts of a carbonate system consisting of a platform and the adjacent slope.
A Asadi; M.R Majidi fard; S.H Vazirii; M Yousefi rad
Abstract
Considering importance of ammonite fauna in biostratigraphy and sedimentary basins and due to the lack of studies on the ammonite fauna in the Kazhdumi Formation, the Nar stratigraphic section was selected and studied in the coastal Fars, northeast of Kangan (East Bushehr). The formation with a ...
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Considering importance of ammonite fauna in biostratigraphy and sedimentary basins and due to the lack of studies on the ammonite fauna in the Kazhdumi Formation, the Nar stratigraphic section was selected and studied in the coastal Fars, northeast of Kangan (East Bushehr). The formation with a thickness of 87 meters in the studied section contains alternation of cream to brown limestone and brownish red marl. The lower boundary with the carbonate of the underlying Dariyan Formation is unconformable and in the upper boundary is gradually covered by the Madoud Member of Sarvak Formation. In the present study, 110 ammonites have been collected which are belong to three genera and seven species. These include Knemiceras sp., Knemiceras persicum, Knemiceras dubertreti, Knemiceras syriacum, Knemiceras comperessum, Tegoceras camatteanum and Lyelliceras lyelli. Based on these one subzone was differentiated indicating a late Early to Middle Albian age for the formation.
S.H Vaziri; M Rami; A Matsouka; M.R Majidifard
Abstract
The Halashi 1 section in south of Kermanshah, West Iran with a thickness of 243 m consists of chert, limestone, mudstone, marlstone and shale and can be divided into 10 Beds/Bedsets. From the studied section, which led to identification the genus Pantanellium that is one of the most prolific genera among ...
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The Halashi 1 section in south of Kermanshah, West Iran with a thickness of 243 m consists of chert, limestone, mudstone, marlstone and shale and can be divided into 10 Beds/Bedsets. From the studied section, which led to identification the genus Pantanellium that is one of the most prolific genera among Mesozoic radiolarians, 143 samples were collected. In present study, five species including Pantanellium whalenae, Pantanellium cf. riedeli, Pantanellium cumshewaense,Pantanellium squinaboli andPantanellium cf. lanceola were identified that indicated an Early Tithonian age for the studied section. Identification of species is according to the pore frame number and the configuration, which are important criteria in the taxonomy of the family Pantanelliidae.
S Azadbakht; M.R Majidifard; S.A Babazadeh
Abstract
In this study, the Surgah formation is identified and introduced for the first time in the east of Khoram-Abad. This formation in the east of Khoram-Abad consists of up to 260 meters light grey, thin to thick –bedded limestone with intercalation of shaly-limestone and a Turonian to Santonian age. ...
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In this study, the Surgah formation is identified and introduced for the first time in the east of Khoram-Abad. This formation in the east of Khoram-Abad consists of up to 260 meters light grey, thin to thick –bedded limestone with intercalation of shaly-limestone and a Turonian to Santonian age. In this section, the Surgah formation has continuous and conformable contacts with the lower Sarvak formation and the upper Ilam formation. In this study, 13 genera, 33 species and 3 biozones of the planktonic foraminifera have been recognized: Biozon I, Helvetoglobotruncanahelvetica-Clavihedbergella –Hedbergella Assemblage Zone indicating Turonian age, Biozon II, Marginotruncana sigali- Marginotruncana schneegansi Assemblage Zone indicating Coniacian age, and Biozone III, Globotruncana ventircosa -Dicarinella concavata Assemblage Zone showing Santonian age.
