List of Articles Biostratigraphy

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Foraminiferal Biostratigraphy of Oligocene to Lower Miocene Deposits (Pabdeh, Asmari, Gachsaran formations) in south-west of Qir, Fars
  نوشا  نوروزی  Daneshian  Baghbani  Aghanabati
  Lower Oligocene and Miocene deposits in Zagros include several formations with considerable lithological changes and faunal diversification. To study these formations more accurately and identifying the boundary among them, 414 samples of Halegan well #1 on the southwes More

  Lower Oligocene and Miocene deposits in Zagros include several formations with considerable lithological changes and faunal diversification. To study these formations more accurately and identifying the boundary among them, 414 samples of Halegan well #1 on the southwest of Qir were studied. Lower Oligocene and Miocene deposits of Halegan well #1 with 414 meter thickness; consist of argillaceous limestone, dolomite, and limestone with intercalation of marl and gypsum and formed the Pabdeh, Asmari and Gachsaran formations. The upper parts of Pabadeh Formation at its upper section include planktonic foraminifera with the age of lower Oligocene Foramtion has Rupelian age and covers conformably the lower part with late Eocene age. The upper boundary of the Pabadeh Formation is conformable with the Asmari Formation. Based on Thomas (1948) definition of the Asmari Formation, in the Halegan well, the Asmari Formation consists of the lower (Oligocene) and middle Asmari (Aquitanian). The upper boundary of the Asmari Formation is unconformable with the Gachsaran Formation. Based on paleontological studies of the lower Oligocene-Miocene deposits of Halegan well, 32 genera and 48 species of benthonic foraminifera and 13 genera and 21 species of planktonic foraminifera were identified and five biozones can be correlated with Wynd’s (1965) biozones 55,56,57,59,63. In ascending order they are: 1-small Globigerina spp. assemblage zone (No. 55) 2-Lepidocyclina-Operculina-Ditrupa assemblage zone (No. 56) 3-Nummulites intermedius-Nummulites vascus assemblage zone (No. 57) 4-Austrotrillina asmariensis-Peneroplis evolutus assemblage zone (No. 59) 5-Rotalia-Elphidium assemblage zone (No. 63) Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Lithostratigraphy and biostratigraphy of the Asmari Formation in southern flank of Mish anticline (Tang-e-Ganaveh)
  Farzad Moradi Abbas Sadeghi Hasan Amiri Bakhtiar
  The Asmari Formation in the southern flank of Mish anticline (in the north of Gachsaran) with a total thickness of 366 m is mainly composed of medium to thick limestone layers. Based on lithological studies, it is mainly composed of a periodic arrangement of marly lime More

  The Asmari Formation in the southern flank of Mish anticline (in the north of Gachsaran) with a total thickness of 366 m is mainly composed of medium to thick limestone layers. Based on lithological studies, it is mainly composed of a periodic arrangement of marly limestone with very thick, thick and medium bedded limestone layers and in some parts it consists of dolomitic layers. The lower contact of the Asmari Formation with Pabdeh Formation is gradual and its upper contact with the Gachsaran Formation is conformable with some sharp lithological changes. Based on change in thickness of layers, color and lithology, this carbonate sequence is subdivided into three lithological units. In Biostratigraphic studies, 28 species belonging to 41 genera of foraminifera were recognized. According to recognized biozone and foraminifera assemblages, 4 biozones and one undetermined zone were classified according to Laursen et al., 2009. The age of the Asmari Formation in this section is Oligocene (Rupelian-Chatian) to Early Miocene (Aquitanian-Bourdigalian). Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Biostratigraphy and paleoecology of the e Member of the Qom Formation based on Ostracoda at Cheshmeh Boroun section, West of Qom
   Daneshian مسعود گودرزی
  The aim of this study is determining systematics and identification of ostracods genera and species of the e Member of the Qom Formation at the studied section (Cheshmeh Boroun) for biostratigraphy and age determination, and palaeoecological investigations considering t More

  The aim of this study is determining systematics and identification of ostracods genera and species of the e Member of the Qom Formation at the studied section (Cheshmeh Boroun) for biostratigraphy and age determination, and palaeoecological investigations considering the abundance and diversity changes of ostracods based on the collected data. The abundance and diversity of the ostracods taxa such as Paracypris، Aurila ،Ruggieria ،Loxochoncha ، Krithe، Xestoleberis, Cytherella mostly suggest a marine environment with normal salinity and warm climate from ecological point of view. However, the increase and decrease of these taxa in the studied section indicate the diversity and abundance changes is related to environmental changes. In fact, this shows the instability of the environmental conditions which seems to be affected by the changes of food and oxygen values, and water turbulence. Based on ostracods assemblages, an Early Miocene age ( Aquitanian- Burdigalian) is exclusively suggested for the e Member of the Qom Formation at Cheshmeh Boroun stratigraphic section. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  4 - Biostratigraphy of Mesozoic-Cenozoic boundary based on calcareous nannofossils in Bulfars section, Southwest Iran
  Saeedeh Senemari
  To study Mesozoic –Cenozoic boundary based on calcareous nannofossils, section of Tang-e- Bulfars in East Ramhormoz was studied. The fossil groups in determining the relative age of the Mesozoic and Cenozoic layers are important. In this interval, a thickness of 32 m More

  To study Mesozoic –Cenozoic boundary based on calcareous nannofossils, section of Tang-e- Bulfars in East Ramhormoz was studied. The fossil groups in determining the relative age of the Mesozoic and Cenozoic layers are important. In this interval, a thickness of 32 meters of shale and limestone were studied and for the first time 35 species of nannofossils were identified. As a result, the identified biozones includes Reinhardtites Levis Zone (UC18/CC24) and the base of Arkhangelskiella cymbiformis (CC25/UC19) with Late Cretaceous age and Heliolithus kleinpellii Zone (NP6) with Selandian/Thanetian age. Based on the identified zones, the transition period of Early Maastrichtian-Selandian/Thanetian and the boundary between the Cretaceous to Paleogene was determined as a discontinuity. The presence of index species of calcareous nannofossils indicates that the studied sediments in the section of Tang-e- Bulfars were deposited in the lower latitudes and under warm climatic conditions. . Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  5 - Biostratigraphy of the Tirgan Formation in Robat-Eshgh (south-west of Bojnurd) and Ghezelghan (North of Bojnurd) stratigraphic sections, and comparing them with each other.
  nassim Riahi عباس  صادقی Mohammad Hossein Adabi حسین  کامیابی شادان
  In order to study biostratigraphy of the Tirgan Formation in western Kopet Dagh, two surface sections including Navia – Robat Eshgh and Ghezelghan, were selected and 230 samples were collected. The Tirgan Formation was measured with a total thickness of 237 and 192 mete More

  In order to study biostratigraphy of the Tirgan Formation in western Kopet Dagh, two surface sections including Navia – Robat Eshgh and Ghezelghan, were selected and 230 samples were collected. The Tirgan Formation was measured with a total thickness of 237 and 192 meters in Navia and Ghezelghan sections respectively and was represented by thick and sometimes medium bedded, grey and weathered cream colored limestones in two localities. In Navia section, the Tirgan Formation conformably overlies the Zard – Shurijeh Formation with sharp lithological changes. However, as a result of being located in the core of an anticline, this boundary is not determined in Ghezelghan section. The Tirgan Formation disconformably underlies the Abderaz Formation in Navia section while conformably underlies the Sarcheshme Formation at Ghezelghan section. As a result of biostratigraphical investigations, 58 species belonging to 68 genera of foraminifera were identified in the Tirgan Formation. Based on benthic foraminifera two biozones were determined as follows: 1. Palorbitolina lenticularis Taxon Range Zone 2. Novalesia producta – Orbitolina spp. assemblage zone According to the determined biozones and fossils associations, the age of the Tirgan Formation is Barremian – Early Aptian in both sections. The comparison of the Tirgan Formation, in two-mentioned sections, shows some differences. In terms of biostratigraphy, there is not any significant distinctions, except for thickness difference in biozones. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  6 - Biostratigraphy and paleoecology of the Asmari Formation at Tang-e Shivi, north-west flank of Nowdan Anticline in north of Kazerun (Interior Fars) and age correlation with three another sections in Costal Fars and Izeh Zone
  ٍٍElahe Sattari
  Abstract In this research, the Asmari Formation΄s benthic foraminifera at Tang-e Shivi north-western flank of Nowdan Anticline in north of Kazerun (Interior Fars), with geographic coordinates E: 51° 44' 58'' and N: 29° 47' 42'', have been studied in order to introduce More

  Abstract In this research, the Asmari Formation΄s benthic foraminifera at Tang-e Shivi north-western flank of Nowdan Anticline in north of Kazerun (Interior Fars), with geographic coordinates E: 51° 44' 58'' and N: 29° 47' 42'', have been studied in order to introduce assemblage zones, age and paleoecology and correlate the age of the Asmari Formation with sections in Costal Fars and Izeh Zone (Firozabad, Dill, Shagabil). Its upper and lower boundaries are comfortable with Gachsaran and Pabdeh formations. Three assemblage zones at the studied section were recognized based on benthic foraminifera and biostratigraphy study. Detected biozones reflect Oligocene (Rupelian and Chattian) and Miocene (Aquitanian) age for this studied deposits with 348 meters thickness. Assemblage zone 1, with Firozabad section and assemblage zone 2 with 3 other sections and assemblage zone 3 with Dill anticline are correlatable. Environmental parameters such as: salinity, light, nutrients, temperature and depth, have played a role concerning the distribution of foraminifera. Accordingly, the Asmari Formation deposited in a normal salinity to hyper salinity water, aphotic to euphotic and oligophy to eutrophy zones. Grain supported microfacies (O4, O5, B, L1, L2, L4, L5 and L7), support reservoir quality for the Asmari Formation in subsurface areas, next to the studies section. The carbonate grain association types of the study section are nanofer, rodalgal, foralgal and foramol. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  7 - Biostratigraphy and Microfacies of the Asmari Formation in The Zagros Basin:Age and Environmental Correlation
  تهمینه خانعلی
  In this research ,biostratigraphy,microfacies and paleoenvionment of the Asmari Formation in the fars provingce(Tang-e Abolhayat,Naura anticline, south-west of Firozabad,Khormuj anticline),High Zagros(Shoorom anticline), IZeh zone (Mokhtar anticline),Dezfu More

  In this research ,biostratigraphy,microfacies and paleoenvionment of the Asmari Formation in the fars provingce(Tang-e Abolhayat,Naura anticline, south-west of Firozabad,Khormuj anticline),High Zagros(Shoorom anticline), IZeh zone (Mokhtar anticline),Dezful Embayment(Tang-e Anbar sepid, Dill anticline, Khaviz anticline,Aghajari oil field ) and Lurstan province(Mamulan,Sepid-dasht,Dehluran and kabirkuh-Darreshahr0,were reviewed and revised for the comprehensive understanding of age and depositional environments. The Globigerina spp.-Turborotalia cerroazulensis-Hantkenina and Nummulites vascus-Nummulites fichteli assemblage zones (Rupelian) are present in Fars province. The dominated microfacies within the Asmari Formation of the Rupelian time are bioclast planktonic, nummulitidae lepidocyclinidae wackestone-packstone, of an outer and middle ramp depositional setting. The Archaias asmaricus-archaias hensoni-Miogypsinoides complanatus assemblage zone (Chattian)is present in Fars ,High zagros,Izeh and Dezful Embayment provinces. The dominated microfacies within the Asmari Formation of the Chattian time are bioclast perforate-imperforate foraminifera wackestone-packstone and mudstone, of an inner ramp depositional setting . The Miogypsina-Elphidium sp. 14-Peneroplis farsensis assemblage zone(Aquitanian) is present in High Zagros, Izeh ,Dezful Embayment and parts of the Fars and Lurestan provinces.The dominated microfacies within the Asmari Formation of the Aquitanian time are perforate-imperforate foraminifera bioclast wackestone –packstone,grainstone,and mudstone,of an inner ramp depositional setting. The Borelis melo curdica –Borelis melo melo assemblage zone (Burdigalian) is present in most areas. But it slightly occurs in fars province. The microfacies of the Asmari Formation during Burdigalian are similar to those of Aquitanian .In sepid-dasht and Tang-e Anbar Sepid sections due to presence Globigerina spp. Assemblage zone and planktonic forminifera wackestone-packstone facies, an outer ramp depositional setting is also suggested. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  8 - Biostratigraphy of the Gurpi Formation Based on Planktonic foraminifera with emphasis on the Cretaceous-Paleogene boundary in Jahangirabad Section, Kabirkuh Anticline, SW Iran
  Alireza Ashouri Samira Rahimi Abass Sadeghi Abbas Ghaderi
  In this research, biostratigraphy of the Gurpi Formation in Jahangirabad section, SW Iran, has been studied .The thickness of the Gurpi Formation in this section is 263 and consists mainly of argillaceous limestone and limestone. The lower boundary with the Ilam Formati More

  In this research, biostratigraphy of the Gurpi Formation in Jahangirabad section, SW Iran, has been studied .The thickness of the Gurpi Formation in this section is 263 and consists mainly of argillaceous limestone and limestone. The lower boundary with the Ilam Formation is comformable with sharp lithology and upper boundary with the Pabdeh Formation is gradational. In this study, 76 species belong to 17 genera and 8 biozones of planktonic foraminifera were recognized. The biozones consist of Globotruncana ventricosa Zone, Radotruncana calcarata Zone, Globotruncanella havanensis Zone, Globotruncana aegyptica Zone, Gansserina gansseri Zone, Contusotruncana contuosa Zone, Abathomphalus mayaroensis Zone and Pseudoguembelina hariaensis. The age of the Gurpi Formation in this section based on these biozones is Middle Campanian to Late Maastrichtian in this section. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  9 - Biostratigraphy and microfacies of the Dariyan Formation in east of Gachsaran (Anneh anticline)
  Samaneh Solymani-Ahmadi Hosyen Vaziri moghadam Ali Taheri
  In this study, biostratigraphy, micofacies and sedimentary environment of Dariyan Formation in Anneh Anticline, near Hosein-Abad village (east of Gachsaran city) were investigated. Dariyan Formation at this study were consisted of 196 meters of thick, medium and thin More

  In this study, biostratigraphy, micofacies and sedimentary environment of Dariyan Formation in Anneh Anticline, near Hosein-Abad village (east of Gachsaran city) were investigated. Dariyan Formation at this study were consisted of 196 meters of thick, medium and thin layers of limestone, with orbitolinids, marl and marly limestone. The Daryian Formation is divided into the upper and lower parts, based on the existence of tongue with thin layer of limestone and laminated shale along with interlayer chert, with a large amount of radiolarids and planktonic foraminifera. In study area, Dariyan Formation conformably overlies the Gadvan Formation and is overlain by Kazhdumi Formation. A total of 114 thin sections were extracted from the study area and 22 benthonic foraminifera and 3 planktonic foraminifera have been identified in 4 biozones and 1 subzone: Praeorbitolina cormyi zone, Palorbitolinoides cf. orbiculata subzone, Hedbergella spp. Assemblage zone, Mesorbitolina texana zone, Mesorbitolina gr. subconcava zone. Based on identified zones in the study section, the age of Dariyan Formation is designated between Early Aptian to Albian. Sedimentary environment study of Dariyan Formation in Anneh Anticline led to identification of 9 microfacies related to open marine and lagoon. Due to the lack of a barrier facies, slumping and storm deposits, lump and grapston, an open shelf sedimentary environment was suggested for deposition of the Dariyan Formation in Anneh anticline. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  10 - Biostratigraphy, Paleobathymetry, and identification of new planktonic foraminiferal species of the Abderaz Formation at Qalezo section, west of the Kopeh-Dagh sedimentary basin
  Meysam Shafiee Ardestani Mohammad Vahidinia Fatemeh Farazifar
  In this study, Abderaz Formation at Qalezo section in the west of the Kopeh-Dagh sedimentary basin has been studied. It has consisted mainly of massive limestone, Marl and chalky limestone units at the mentioned section. Abderaz Formation at Qalezo section, the lower co More

  In this study, Abderaz Formation at Qalezo section in the west of the Kopeh-Dagh sedimentary basin has been studied. It has consisted mainly of massive limestone, Marl and chalky limestone units at the mentioned section. Abderaz Formation at Qalezo section, the lower contact with Aitamir Formation is paraconform and the upper contact with Abtalkh Formation is conformed and continuous. The thickness of Abderaz Formation, 216 meters, has been measured. In this investigation have been identified 55 planktonic foraminifera species belong to 15 genera, in a frame of 4 biozones have been recognized. Finally, based on this research was distinguished from latest Early Turonian-Late Santonian ages for this section. In this study four planktonic foraminifera species, Dicarinella bouldinensis (Pessagno 1967), Dicarinella takayanagii Hasegawa 1999, Marginotruncana desioi (Gandolfi 1955), Marginotruncana caronae Peryt 1980 have been introduced for the first time in Iran. Also in this research planktonic foraminifera test geometric in Abderaz Formation at Qalezo section has been studied for sea-level changes. In Lower-Middle Turonian substages, the high frequency of the M1 group and low frequency of M3 group displayed fall seal level at this time. In Late Turonian frequencies of M3 group with accompany of %P was shown rise sea level. In the Coniacian and Santonian stages, the M1 group is dominant and the M3 group is low frequency and all of the mentioned evidence were demonstrates fall sea level. Also, the depth average of the studied section based on Depth = e (3.58718 + (0.03534 × %P)) has been calculating 146 meters which were shown these sediments deposited in Outer Neritic environment. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  11 - (Biostratigraphy and microfacies of the Asmari Formation in south flank of Mish anticline (northeast of Gachsaran
  Saber Ahmadi Ali seyrafian Hosyen vaziri-Moghadam
  Asmari Formation at the section of the south flank of Mish anticline (northeast of Gachsaran), located 22 km northeast of Basht city, in vicinity village Kalagh ¬Neshin is investigated and has a thickness of 281 meters. In this research, biostratigraphy and microfacies More

  Asmari Formation at the section of the south flank of Mish anticline (northeast of Gachsaran), located 22 km northeast of Basht city, in vicinity village Kalagh ¬Neshin is investigated and has a thickness of 281 meters. In this research, biostratigraphy and microfacies of the Asmari Formation in this section were studied and the results were compared with 5 section of Asmari Formation in similar regions and close to it. By studying on 172 microscopic sections, 3 the biozone for Asmari Formation in the section the study was carried out and the section studied given that is: Lepidocyclina – Operculina – Ditrupa assemblage zone. Archaias asmaricus – Archaias hensoni – Miogypsinoides complanatus assemblage zone. Indeterminate zone. According to the study of benthic foraminifera and biozones, the cut off age is from the late Oligocene (Rupelian-Chattian) to the early Miocene (Aquitanian). Microfacies studies led to identify 10 microfacies and 4 subfacial belonging to the open marine and lagoon (semi-closed and enclosed) environments, which includes the external, intermediate, and interior parts of a hemocalinal ramp. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  12 - Biostratigraphy of the Campanian-Maastrichtian deposits of the Gurpi Formation in Chenar anticline, Lorestan Zone and comparison with adjacent areas
  Iraj Maghfori-Moghaddam ندا  افروزه
  In this research, biostratigraphic studies of the Gurpi Formation were carried out at the Chenareh section (Lorestan Zone). The thickness of Gurpi Formation at the studied section is 140 m and consists of limestobe, marly limestone and marl. The Gurpi Formation conforma More

  In this research, biostratigraphic studies of the Gurpi Formation were carried out at the Chenareh section (Lorestan Zone). The thickness of Gurpi Formation at the studied section is 140 m and consists of limestobe, marly limestone and marl. The Gurpi Formation conformablely (with significant lithological changes) underlies the white limestones of the Ilam Formation and is covered by the sandstone of the Amiran Formation. On the basis of the recognized planktonic foraminifera, 7 biozone were reported as follows: Globotruncanita elevata Partial range Zone (Early Campanian), Globotruncana ventricosa Interval Zone (Middle to Late Campanian), Radotruncana calcarata Total Range Zone (Late Campanian), Globotruncanella havanensis Partial Range Zone (Late Campanian), Globotruncana aegyptiaca Interval Zone (Late Campanian), Gansserina gansseri Interval Zone (Late Campanian-Early Masstrichtian), Contusotruncana contusa Interval Zone (Late Masstrichtian). In the studied section, the Seymareh and Imam Hassan sections are not observed, unlike other sections in the Lorestan basin. The thickness of this formation in Chenareh anticline is much less than other sections in the adjacent areas. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  13 - Biostratigraphy and Lithostratigraphy of Pabdeh Formation is based on planktonic foraminifera in the section of Jahangirabad (south Ilam_ Zagros basin)
  somaye taherizade Mohammad Vahidinia mohammadhossein mahmoudi gharaii
  10.61186/ispg.40920.11.22.66
  After the Late Cretaceous and during the Paleogene, with the sea level rising, the Zagros sedimentary basin is covered with a progressive sea in which the Pabdeh Formation is deposited. The dual function of this formation as a source of oil and its reservoir capacity More

  After the Late Cretaceous and during the Paleogene, with the sea level rising, the Zagros sedimentary basin is covered with a progressive sea in which the Pabdeh Formation is deposited. The dual function of this formation as a source of oil and its reservoir capacity due to the diversity of lithology and its location between the two reservoirs Asmari and Bangistan, and the age of this formation is one of the issues that has attracted the attention of geologists. In order to study the stratigraphic and biostratigraphic rock of the Pabdeh Formation, the Jahangirabad section in the northwest of Zagros sedimentary basin has been selected and sampled. 320 samples were taken, of which 230 samples were prepared by washing method, and 90 samples were prepared by thin section method and examined. Based on studies conducted in the Jahangirabad section, 25 genera and 110 species have been identified, and based on the identified fossils, 27 biozones and 7 sub-biozones have been identified. Based on the identified biozones, the age of the Pabdeh Formation in the Jahangirabad Danian Early-Late Chattian section has been obtained. Pabdeh Formation deposits in the Jahangirabad section have a thickness of 676 m (beginning of purple shale to anhydrite Kalhor) which includes units of purple shale (2 parts), marl limestone with lower limestone, limestone, and marl limestone with limestone It is high. In this section, the lower boundary of the Pabdeh Formation is continuous with shales and marls of Gurpi Formation, and its upper boundary is with continuous limestone of Asmari Formation. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  14 - Biostratigraphy and paleoecology of Family Gavelinellidae in Sanganeh and Aitamir Formations at the Kopeh-Dagh basin
  Maryam Motamedalshariati Mahmoud Jalali
  10.61186/ispg.41339.11.22.89
  The sedimentary basin of Kopeh-Dagh is located in the northeast of Iran. This sedimentary basin has been of interest for a long time because of hydrocarbon materials. Gavelinellids are the most abundant and dominant groups of benthic foraminifera in epicontinenal seas d More

  The sedimentary basin of Kopeh-Dagh is located in the northeast of Iran. This sedimentary basin has been of interest for a long time because of hydrocarbon materials. Gavelinellids are the most abundant and dominant groups of benthic foraminifera in epicontinenal seas during Cretaceous period which belong to Rotaliinacean foraminifera. They have shown a wide biogeographical distribution and dispersion in many areas of Tethys. Their evolutionary trend during the Cretaceous time was success. The high concentration of marine sedimentary rocks and the absence of igneous activities in the Kope-Dagh sedimentary basinhave caused it to be considered the most suitable basin for the formation and accumulation of hydrocarbons after the Zagros sedimentary basin. This basin has suitable layers of carbonate rocks and porous sandstones to store hydrocarbon materials, also thick layers of shales in this basin can act as suitable source and cap rocks. In this research some genera and species from this family in Sanganeh and Aitamir Formations at five stratigraphic sections including Marave Tappeh, Takal kuh, Sheykh, Gadvecanlou and Kalat from point of biostratigraphical and paleoecological applications have been investigated. In this study, four biozones including Gavelinella flandrini-Gaudryina cf. praedividens assemblage zone, Berthelina intermedia assemblage zone, Berthelina cenomanica Assemblage Zone, Berthelina intermedia-Osangularia schloenbachi Assemblage Zone have been introduced. Based on the reported genera and species of the Gavellinidae family, it can be stated that the studied formations were deposited in the middle and outer part of the continental shelf to the upper part of the continental slope and in aerobic to semi-aerobic environments. The presence of more planktonic foraminifera than benthic foraminifera in the Aitamir Formation, the depth of the basin increases. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  15 - Lithostratigraphy and Biostratigraphy of Pabdeh Formation based on planktonic foraminifera in the Ilam dam section (south Ilam_ Zagros sedimentari basin)
  somaye taherizade Mohammad Vahidinia Mohammadhossein mahmoudi gharaii
  Zagros Sedimentary basin is located in the south and southwest of Iran and Pabdeh Formation is one of the most important Cenozoic units of Zagros Sedimentary basin. In addition, Pabdeh Formation is of special importance as one of the source rocks of Zagros Sedimentary b More

  Zagros Sedimentary basin is located in the south and southwest of Iran and Pabdeh Formation is one of the most important Cenozoic units of Zagros Sedimentary basin. In addition, Pabdeh Formation is of special importance as one of the source rocks of Zagros Sedimentary basin. In order to study the Lithostratigraphic and Biostratigraphic rocks of Pabdeh Formation, the section of Ilam dam in the northwest of Zagros sedimentary basin has been selected and sampled. 360 samples were taken, of which 260 washing samples and 100 thin section samples were prepared. Based on the studies performed on these samples, 25 genera and 105 species have been identified in the Ilam dam section. 26 biozones and 2 sub-biozones have been identified based on the biological zoning of Wade et al., 2011 in the Tethys area. Based on the identified biozones, the age of Pabdeh Formation in the Ilam dam section, Middle Danian-Early Aquitanian has been obtained. The deposits of Pabdeh Formation in the section of Ilam dam have a thickness of 764 m (beginning of Pabdeh to the beginning of Kalhor anhydrite) which includes purple shale units (2 Units), marl limestone with lower limestone, cherti limestone, marl limestone with upper limestone. The lower boundary of Pabdeh Formation in this section is conform and continuous with shales and marls of Gurpi Formation but its upper boundary with the gypsums of the Asmari formation is most likely accompanied by a disconform. Manuscript profile