Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna
The studied section located in the Djam-Semnan area 55 kms south west Damghan, at the vicinity of the Amrovan rail way station, in the northern flank of Shorab unassymetric anticline. The section is 440 meters thick, including limestone, dolomitic limestone and sandstone with rich fossils contents (...
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| Format: | Article |
| Language: | fas |
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University of Isfahan
2016-09-01
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| Series: | Journal of Stratigraphy and Sedimentology Researches |
| Subjects: | |
| Online Access: | http://jssr.ui.ac.ir/article_20877_130a8d11e5b3f84a5a094791f7bac89c.pdf |
| _version_ | 1811294596986044416 |
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| author | Mehdi Hoveida Ali Bahrami Mehdi Yazdi |
| author_facet | Mehdi Hoveida Ali Bahrami Mehdi Yazdi |
| author_sort | Mehdi Hoveida |
| collection | DOAJ |
| description | The studied section located in the Djam-Semnan area 55 kms south west Damghan, at the vicinity of the Amrovan rail way station, in the northern flank of Shorab unassymetric anticline. The section is 440 meters thick, including limestone, dolomitic limestone and sandstone with rich fossils contents (e.g.: trilobite, coral, brachiopod, crinoid segments and vertebrate remains). The lower boundary is covered with the recent alluvial and the upper boundary disconformably overlain by the red marls and sandstones of the Permian Dorud formation. In order to determine biostratigraphy and bifacies of the deposits of Bahram formation in Shorab section, twenty five samples (4-6 kgs) were collected and processed with conventional actic/formic acid. Nineteen samples were prolific and totally yielded 340 conodont elements. The extracted conodont elements mainly separated out of the carbonate units. Thirty-one species belong to four genera (Polygnathus, Icriodus, Pelecysgnathus and Ancyrodella) were discriminated as: Icriodus excavatus, I. expansus, I. cedarensis, I. subterminus, I. iowaensis, I. alternatus, I. tafilaltensis, I. brevis, I. cf. expansus, I. sp., Polygnathus brevilaminus, Poly. angustidiscus, Poly. pollocki, Poly. cf. webbi, Poly. aspelundi, Poly. politus, Poly. alatus, Poly. webbi, Poly. cf. olgae, Poly. dubius, Poly. xylus, Poly. zinaidae, Poly. sp., Pelekeygnathus inclinathus, Pele. serradentatus, Pele. sp., Ancyrodella pristina, Acny. cf. pristina, Ancy. aff. binodosa, Ancy. sp. Based on the frequency and distribution of the collected elements Late Givetian to Early Famennian age were suggested to the studied interval. Conodonts biofacies (icriodid-polygnathid) confirm the deposition of the Bahram formation of the Shorab section in the shallow carbonate condition. |
| first_indexed | 2024-04-13T05:19:47Z |
| format | Article |
| id | doaj.art-f24c46b40692432e805895ea37130eda |
| institution | Directory Open Access Journal |
| issn | 2008-7888 2423-8007 |
| language | fas |
| last_indexed | 2024-04-13T05:19:47Z |
| publishDate | 2016-09-01 |
| publisher | University of Isfahan |
| record_format | Article |
| series | Journal of Stratigraphy and Sedimentology Researches |
| spelling | doaj.art-f24c46b40692432e805895ea37130eda2022-12-22T03:00:47ZfasUniversity of IsfahanJournal of Stratigraphy and Sedimentology Researches2008-78882423-80072016-09-01323759220877Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont faunaMehdi Hoveida0Ali Bahrami1Mehdi Yazdi2University of IsfahanUniversity of IsfahanUniversity of IsfahanThe studied section located in the Djam-Semnan area 55 kms south west Damghan, at the vicinity of the Amrovan rail way station, in the northern flank of Shorab unassymetric anticline. The section is 440 meters thick, including limestone, dolomitic limestone and sandstone with rich fossils contents (e.g.: trilobite, coral, brachiopod, crinoid segments and vertebrate remains). The lower boundary is covered with the recent alluvial and the upper boundary disconformably overlain by the red marls and sandstones of the Permian Dorud formation. In order to determine biostratigraphy and bifacies of the deposits of Bahram formation in Shorab section, twenty five samples (4-6 kgs) were collected and processed with conventional actic/formic acid. Nineteen samples were prolific and totally yielded 340 conodont elements. The extracted conodont elements mainly separated out of the carbonate units. Thirty-one species belong to four genera (Polygnathus, Icriodus, Pelecysgnathus and Ancyrodella) were discriminated as: Icriodus excavatus, I. expansus, I. cedarensis, I. subterminus, I. iowaensis, I. alternatus, I. tafilaltensis, I. brevis, I. cf. expansus, I. sp., Polygnathus brevilaminus, Poly. angustidiscus, Poly. pollocki, Poly. cf. webbi, Poly. aspelundi, Poly. politus, Poly. alatus, Poly. webbi, Poly. cf. olgae, Poly. dubius, Poly. xylus, Poly. zinaidae, Poly. sp., Pelekeygnathus inclinathus, Pele. serradentatus, Pele. sp., Ancyrodella pristina, Acny. cf. pristina, Ancy. aff. binodosa, Ancy. sp. Based on the frequency and distribution of the collected elements Late Givetian to Early Famennian age were suggested to the studied interval. Conodonts biofacies (icriodid-polygnathid) confirm the deposition of the Bahram formation of the Shorab section in the shallow carbonate condition.http://jssr.ui.ac.ir/article_20877_130a8d11e5b3f84a5a094791f7bac89c.pdfDevonianBahram formationShorab sectionBiostratigraphyBiofaciesSouthwest Damghan |
| spellingShingle | Mehdi Hoveida Ali Bahrami Mehdi Yazdi Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna Journal of Stratigraphy and Sedimentology Researches Devonian Bahram formation Shorab section Biostratigraphy Biofacies Southwest Damghan |
| title | Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna |
| title_full | Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna |
| title_fullStr | Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna |
| title_full_unstemmed | Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna |
| title_short | Biostratigraphy and biofacies of the Devonian deposits of the Kuh-e-Shorab section (southwest Damghan) based on conodont fauna |
| title_sort | biostratigraphy and biofacies of the devonian deposits of the kuh e shorab section southwest damghan based on conodont fauna |
| topic | Devonian Bahram formation Shorab section Biostratigraphy Biofacies Southwest Damghan |
| url | http://jssr.ui.ac.ir/article_20877_130a8d11e5b3f84a5a094791f7bac89c.pdf |
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