
Mehdi YazdiUniversity of Isfahan · Department of Geology
Mehdi Yazdi
PhD
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126
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Introduction
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December 1989 - August 2015
Publications
Publications (126)
The Late Miocene-Early Pliocene bivalve Placuna placenta (Linnaeus, 1758) is reported for the first time from Southern Iran. The shells of this species are extremely thin and fragile, and mostly disarticulated in our material, affected by compression, bioerosion, encrustation, and abrasion. In the Qeshm Island, mid-late Miocene samples from Rahgost...
3 1-شناسی زمین گروه شناسی فسیل و شناسی چینه دکتری دانشجوی ایران اصفهان، اصفهان، دانشگاه 2-ایران اصفهان، اصفهان، دانشگاه علوم، دانشکده شناسی، زمین گروه شناسی، فسیل و شناسی چینه دانشیار 3-ایران اصفهان، اصفهان، دانشگاه علوم، دانشکده شناسی، زمین گروه شناسی، فسیل و شناسی...
TST و HST سکانسي مرز يک با که بوده نوع از SB2 مي جدا هم از برش در شوند. باختر داراي اول سکانس زفره سيستم تراکت TST و HST سکانسي مرز يک با و بوده نوع از SB1 از شامل که دوم سکانس تراکت سيستم LST ، TST و HST مي جدا بوده گردد شامل که دوم سکانس از و بوده...
The Albian- Cenomanian deposits of
the Kazhdumi Formation at Zagros
Basin (Firuzabad section and Central
Iran (Fasakhod section), represents a
carbonate sedimentary succession and
contain rich and diverse invertebrate
macro fauna. Detailed studies on
about 200 specimens of invertebrate
macro fauna revealed from two stratigraphic
intervals led to re...
The study presents new records of brachiopods from the Lower Miocene deposits of the Qom Formation from two sections, Bagh and Ramsheh in the Isfahan province, Central Iran. Three species, i.e. Argyrotheca bitnerae, Joania cordata, and Platidia anomioides, have been identified in the investigated material. All species are present in the Bagh sectio...
New findings of crustacean decapod brachyurans from the Rupelian period (lower Oligocene) in Iran are presented in this study. In particular, Lophoranina sp. and Palaeocarpilius cf. P. rugifer Stoliczka, 1871, from the Rupelian strata were found in two previously unexplored localities, Abshar and Vezg near Yasuj in the southwestern region of Iran....
In the present work, we report the discovery of several carapaces of Zanthopsis sp. from the Lower Eocene of Central Iran, which represent the easternmost record of the genus. In addition, we discuss on the similarities of the different species and/or morphotypes of the genus, and conclude that the European species could be ascribed to the “Zanthop...
The study presents the first record of Early Oligocene brachiopods from the Lower Red Formation of the Isfahan Province, Central Iran. The assemblage comprises six brachiopod taxa, belonging to five genera, Novocrania Lee and Brunton, Thecidellina Thomson, Argyrotheca Dall, Joania Álvarez, Brunton and Long, and Platidia Costa. Two species are descr...
The presence of trace fossils and their diversity in Miocene deposits of western Makran accretionary prism (SE Iran) was the center of this research. The trace fossil contents of Cheraghsuz and Sardasht (with Middle Miocene in age) and Gowharan (with Early Miocene in age) stratigraphic sections were analyzed. The recognized specimens of the Cheragh...
In this paleological study we focused on a
coralline red algae-rich shoal grainstone
facies in the Lower Miocene (Aquitanian)
carbonates of the Qom Formation in the
Vartun sectionin central Iran. The identified
coralline red algae are mainly non-geniculate,
although very rare geniculate forms
of corallines were also recognized in thin
section analy...
From the lower Miocene (Burdigalian) of the Qom Formation, exposed in three sections (Kuh-e-Donbeh, Bagher-Abad, and Vartun) in Central Iran, a deca-pod crustacean assemblage is described. The specimens exhibit two modes of preservation: carapaces (either isolated or with attached appendages) and isolated cheliped elements. All studied specimens ar...
Abstract
Exceptional occurrence of The Late Triassic Monotid ‘shell bed’ in West Isfahan is a considerable event. Monotis is a thin shell ‘flat clam’ of Monotidae Family. Its globally widespread, short range and crowdy abundance in thin shell bed sedimentary layers, make it useful Index fossil for Upper Triassic Biochronostratigraphy. The Triassic...
The Givetian to Famennian (Middle-Upper Devonian) Bahram Formation deposits (Bondar and Shahzadeh
Mohammad sections) in the Kerman region, Central Iran were sampled for conodonts. The conodonts were
described, their distribution investigated, and the studied sections were correlated. In the previous conodont-
based papers, the age of the Bahram For...
The Baqer-Abad section, northeast Isfahan Province, Central Iran has a thickness of 220 m representing mainly shallow-water palaeoenvironments with fossiliferous abundance and biodiversity. The zonal division in this section includes ten Famennian zones as follows, from the bottom to the top: triangularis Zone, crepida Zone, Lower rhomboidea Zone,...
The second fossil isopod from Iran is herein reported. Additional specimens of the small lobster Huhatanka iranica Bahrami and Vega in Yazdi et al. (2010) are also revised. The afore-mentioned allows differentiating this species from the only other known species, H. kiowana (Scott, 1970) from the Albian of Kansas, USA. Some indeterminate callianass...
A comprehensive study of the palaeoenvironmental and post-mortem conditions of Cenozoic clypeasteroids from the Miocene (Aquitanian) of the Qom Formation in the Esfahan–Sirjan Basin (central Iran) is based on test morphology, taphonomy, test surface preservation, echinoid abundance and echinoid sedimentary fabrics (density, orientation, and cluster...
The paleontology and paleoecology of coralline red algal assemblages of Asmari carbonate platform in north-west Zagros basin (Lurestan province) are described. The Asmari Formation was deposited during the Burdigalian to Langhian interval. This Formation unconformably overlies Eocene dolomites of Shahbazan Formation and is conformably underlain by...
A study of bryozoans and brachiopods from the Varton, Zefreh and Kuh-e-Charkheh sections from the Esfahan-Sirjan fore-arc basin of the Qom Formation of Central Iran has yielded 30 bryozoan taxa, including one new species Gigantopora vartonensis , and six brachiopod species. Both assemblages co-occur with large oyster shells with some of the ventral...
Environmental contamination with heavy metals is of concern as plants have the ability to absorb chemical toxicants facilitating the entry of toxic metals into the food chain. Lettuce (Lactuca sativa Linn.) was cultured in four nutrient solutions containing different concentrations of cadmium (0, 3, 6, and 9 mmol). The impact of heavy metal on the...
Crops can become contaminated when grown in soils containing heavy metals. Cadmium is a heavy metal that poses a significant health risk to humans. The purpose of this study was to evaluate the effect of cadmium on lettuce (Lactuca sativa Linn)and the contamination risk of lettuce grown in cadmium environments. The results showed that photosynthesi...
These palaeoecological investigations were carried out on foraminiferal assemblages from the Qom Formation in the Bagher-Abad section, northeast of Isfahan, Central Iran. Foraminiferal analysis of the lower limestone part of the succession revealed correlation with the Chattian zone SBZ (Shallow Benthic Zone) 23, and the overlaying marly strata rev...
در این پژوهش بهلحاظ ارزش والای آثار معماری سنگی ایران و ضرورت حفظ و نگهداری آنها برای آیندگان، پژوهشی بر ارتقای خواص مکانیکی سنگ آهکی (سنگ آهک ماسهدار) بهکاررفته در معماری پاسارگاد از طریق استفاده از مادۀ نانوسیلیکات (SiO2) بهعنوان استحکامبخش برای بهبود خواص مکانیکی سنگ و درنتیجه افزایش عمر این نوع سنگها انجام گرفت. در این راستا خواص جذب آب...
The Mesozoic fauna of southwestern Asia remains poorly understood. Here, we report on an assemblage of marine invertebrates and vertebrates from the Lower Cretaceous Dariyan Formation of Iran. The Dariyan Formation consists of 60 m of carbonates deposited in shallow seas. These deposits exhibit a high abundance of foraminifera that belong to nine g...
Facies analysis and paleoenvironmental reconstruction of the Burdigalian to Langhian Asmari Formation, outcropping in the Khorram Abad Anticline, in the north-west of the Zagros Basin allow us to interpret the carbonate ramp history during the Early–Middle Miocene time span. The biota producing sediments in this system are dominated by the rhodalga...
محوطههای بازِ تاریخی ساختهشده از سنگ در ایران، در مقایسه با دیگر آثار، تعداد تعداد نسبتا محدودی هستند؛ اما این آثار باقیمانده ارزش و قدمت بالایی دارند و نکات پژوهشنشدۀ بسیاری در آنها وجود دارد. از آنجا که بیشتر این محوطههای سنگی در ایران قدمتی حدودا دوهزارساله دارند، مدتزمان زیادی در معرض عوامل آسیبرسان قرار گرفتهاند. اطلاعاتی در زمینۀ انوا...
This research is focused on a poorly studied Jurassic sequence in the eastern part of Alborz and Western Koppeh Dagh basins. The foraminifera are reported from Callovian (Middle Jurassic) to Tithonian (Upper Jurassic) sediments of the Farsian and Chaman Bid formations. The benthic foraminiferal associations belong to the families Ammodiscidae, Epis...
سنگهای به کار رفته در مجموعه میراث جهانی پاسارگاد در ظاهر به لحاظ بافت و رنگ متفاوت هستند و از نظر ظاهري شامل سه نوع سنگ متفاوت ميشوند. به همين دليل، ممکن است دارای رفتارهای متفاوت فیزیکی و شیمیایی نیز باشند. تخریبهای سطحی صورت گرفته در اين سنگها با وجود شرایط یکسان محیطی، شکلهای متفاوتی دارند. هدف از این پژوهش تشخیص ماهیت شیمیایی سنگهای این م...
در دو دهه اخیر برخی از مواد صنعتی در جهت مصارف حفاظتی و مرمتی در حوزه آثار تاریخی، بهینهسازی شدهاند و به عنوان پوششدهنده برای افزایش دوام آثار در مقابل عوامل محیطی رواج یافتهاند. هدف این پژوهش شناسایی یک ماده استحکامبخش سطحی، مناسب سنگ آهکی کرم رنگ در مجموعه تاریخی پاسارگاد است. بدین ترتیب، از بین جدیدترین مواد، سه ماده متفاوت که همخوانی بیش...
The architectural remains at Pasargadae were built of three different stones classified according to their colors (beige, dark-gray, and green-gray). The stones show different macroscopic features, such as texture and decay patterns. The aim of this study is to identify the composition of the stones and to evaluate the main decay factors through pe...
Tubes of the characteristic serpulid species Rotularía spirulaea (Lamarck, 1818) are widespread in the Eocene of the Neo-Tethyan Realm. Here they are described from the state of Iran for the first time. Their ultrastructure and the mode of life, paleogeography and palaeoecology of this species are discussed. Rotularia spirulaea occurs in Eocene lim...
Conodont fauna from the Kesheh and Dizlu sections in the North Isfahan province were investigated. Shallow-water and/or near-shore conodonts, mainly belonging to the icriodid–polygnathid biofacies, dominate the conodont fauna. Due to the depositional setting which is characterised by predominantly shallow-water palaeoenvironments and the lack of so...
The aim of this study is to bridge a gap in the existence of Trilobites in the marine Permian successions of Iran by exploring a stratigraphic section of the Permian in Jamal Formation (Dizlu section). Based on comprehensive field studies and laboratory investigations three Trilobite specimens were identified in the study area including Pseudophill...
Fossil insects are very rarely found in sediments of deep marine origin. Nevertheless they can be of great interest to trace past events such as trans-oceanic migrations. Here we document the first fossil insects from Iran, viz. several alate ants dead during mating swarms and a migratory locust, found in the pelagic Oligocene sediments of the Zagr...
In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the basis of the recognized foraminifera, the age of Qo...
Grinding stones are often of considerable importance in knowledge of traditional societies. However, Grinding tool labels are seldom related to actual morphology, tool design or use-wear modification. Also, they have received minimal analytical attention by archaeologists. In this study, fourteen tools so-called Farming tools or grinding stones wer...
This paper aimed to study Lower Miocene (Burdigalian) mixed carbonate–siliciclastic deposits within an Upper Cenozoic synorogenic conglomerate–dominated succession in north of Shalamzar in the Zagros foreland basin, Iran. The deposits are composed of nine facies: foraminiferal mudstone, silty mudstone, sandy mudstone, fossiliferous sandy mudstone,...
The Dizlu and Bagh Sections in the Oligocene - early Miocene Qom Formation (northeast of Isfahan, central Iran) has yielded a rich association of Bryozoa including eleven species belonging to the order Cyclostomata. The description of these eleven species (including three new species (Exidmonea baghi sp.n., Nevianipora isfahani sp.n. and Polyascoso...
For the first time, moderate preserved radiolarian fauna were recovered from early Cretaceous (Dariyan Formation) cherty beds and black shales successions outcropping at Kuh-e Banesh located in high Zagros belt, southwestern Iran. Radiolarian assemblages were recovered from the lower part of Daryian Formation are described and assigned Late Barremi...
Two species of spatangoid echinoid belonging to Heteraster Orbigny, 1853, are described from Lower Cretaceous deposits (Gadvan and Dariyan formations) at the Kuh-e Gadvan and Banesh sections situated in Zagros Mountains, south of Iran. Heteraster couloni (Agassiz, 1839) is confirmed in the Barremian and Heteraster delgadoi (Loriol, 1884) in the lat...
The Zefreh section in central Iran represents a carbonate ramp succession with a general shallow-marine palaeoenvironment. This section represents most of the Bahram Formation (Givetian to at least Middle falsiovalis Zone) and consists of a very heterogeneous succession of medium- to coarse-grained sandstones, skeletal pack- to grainstones with loc...
A bryozoan fauna from the Late Devonian (Frasnian) of the Bahram Formation of the Zefreh section in central Iran contains four species: three trepostomes and one rhabdomesine cryptostome. Two species are new: the trepostome Coeloclemis zefrehensis sp. nov. and the rhabdomesine cryptostome Euthyrhombopora tenuis sp. nov. The trepostome species Cypho...
Miocene coral-bearing limestones, distributed in the western Makran Basin, are attributed to Aquitanian and Burdigalian. This investigation is focused on three Early Miocene coral-bearing limestone sections in western Makran. Remarkably, well-preserved scleractinian corals and other components could be very definitive to reconstruct paleoenvironmen...
Pasargadae is an archaeological site from Achaemenid period (550 BC) which is one of Iran’s UNESCO World Heritage Sites. It included: mausoleum of Cyrus the Great, two royal palaces, fortress and the remains of a temple. Three different types of limestones are distinguished on the basis of their color: beige, green-gray, and dark-gray. In naked eye...
Pasargadae is an Achaemenid archaeological site in south of Iran. There are some remains of stone monuments in this site such as Cyrus Tomb, Tomb of Cyrus' son and successor (Cambyses II), two royal palaces, and the fortress of Toll-e Takht. The monuments have been made out of three different types of carbonate stones in beige, green gray and dark...
Introduction
Due to difficult access to Makran Basin, a few geological investigations have been performed so far. The successions of the Band-e-Chaker Unit in Tejek, Kermestann, and Irer sections were measured and studied. Bioerosion is frequently seen in the corals of the studied sections. Through this paper, we investigate on bioerosion and its r...
In Iran, stone archaeology sites such Persepolis, Pasargadae, and Kangavar (Anahita temple) are exposure to decay and degradation in the absence of scientific investigation. One of the main functions in conservation of historical artifacts is consolidation. Consolidation treatments due to of their potential to cause undesirable effects and irrevoca...
The decapod crustacean Retrocypoda almelai Via Boada, 1959 is reported from Bartonian (middle Eocene) strata of Soh (North of Isfahan, Iran) and represents the most oriental record for the species, hitherto considered endemic and restricted to the western margin of Tethys. This finding is important to understand the paleobiogeographic distribution...
Pasargadae archaeological complex is the first capital of Achaemenid period dated to about 550 BC and is located 135 Km north-east from Shiraz, in Fars province (South of Iran). There are different royal buildings in this archaeological site that ruined as the time goes on and only some stone parts of these buildings left standing. Pasargadae build...
This paper presents a review of palaeoenvironmental reconstructions of scleractinian corals from the Oligo–Miocene Qom Formation in northeastern Esfahan, central Iran. A total of nine genera and four species of colonial corals are identified, including Platycoenia iranica, Goniopora sp., Porites sp., Tarbellastraea reussiana, Solenastrea sp., Favit...
The recently discovered carbonate–siliciclastic intervals within an upper Cenozoic synorogenic conglomeratic succession in the Shalamzar area of the Zagros sedimentary basin in central western Iran contain abundant and diverse assemblages of foraminifera. A total of 32 genera and 34 species of benthic and five genera and eight species of planktic f...
In orther to determine and interpretation of the biofacies and sea level changes of paleoenvironments of Devonian deposits in Shurab section, 25 samples (4-6 km each) have systematically collected. The section is located in the Djam area, Semnan province, 55 km south west Damghan. The section is part of the northern border of the central Iran micro...
Abstract:
The Middle-Upper Devonian carbonate deposits of Bahram Formation in Reza-Abad section (SW Damghan), has yielded a spectacular fossiliferous layer reach of multi lamellar ostracods of Eridostracina suborder for the first time. Eridostracina are a lesser known extinct tropical-subtropical marine ostracods of Palaeocopida Order which ranged...
سنگهای ساب، ابزارهایی برای شکستن، خرد کردن و پودر کردن غلات و دانهها بودند و هستند. در ایران استفاده از این ابزراها در اکثر تپهها و سایتهای تاریخی از عصر نئولیتیک تا دوران اسلامی رواج داشتهاند. در گزارشات و پژوهشهای باستان شناسی این ابزارها نسبت به دیگر ابزارها مورد توجه قرار نگرفته و تا کنون گزارش دقیقی منتشر نشده است، همچنین قابل ذکر است که...
Pasargadae world heritage consists of some stone monuments such as Cyrus Tomb, Tomb of successor (Cambyses II), two royal palaces, and the fortress of Toll-e Takht. The monuments in Pasargadae made out of carbonate stones, the stones are in different physical conditions with respect to deterioration. Some of the “Black Stone” are scaled and exfolia...
Four sections of mainly Middle Devonian (Givetian) shallow-marine rocks at the northern margin of Gondwana (Central Iran) were investigated with a special focus on the Bahram Formation, as the stratigraphic range of the Bahram Formation is uncertain and still under discussion. Generally, the Bahram Formation is discontinuously underlain by the Lowe...
Abstract:
Late Devonian deposits of Bahram Formation in Kuh-e-Shorab section is located in Djam area, 55km southwest Damghan, north Shorab village. The studied deposits belong to the Central Iran domain, the measured profile has about 307 m thick mainly including alternation of limestones, sandstones and dolomites rich in fossil contents such as, b...
The early Miocene Qom Formation is exposed in the Bagh section, northeast Isfahan, Central Iran, where it unconformably overlies
Oligocene deposits and is unconformably overlain by the Upper Red Formation. The formation is mainly represented by carbonate
deposits (marl, marly limestone facies) and subordinate siliciclastic facies. The planktonic...
The study of the conodont fauna from the Bahram Formation in the Sar-e-Ashk section provides new data on the stratigraphy of this unit in the Kerman Province, Central-East Iran. The study area is located in the southwestern part of the Central-East Iran Microplate. The fauna consists of thirteen species and four taxa in open nomenclature, mainly be...
We report on decapod crustaceans from the Eocene of Zagros Basin (Baba-Heydar section, Shahr-e-kurd area, Iran). The studied sample includes crustacean penaeids and scyllarids that have been assigned as follows: Eopabdehus nov. gen., with E. babaheydariensis n. sp. (Penaeidae Rafinesque, 1815), Eogordonella nov. gen., with E. iranianiensis n. sp. (...
The deep-sea hatchetfish clade includes some of the most bizarre stomiiforms, which are characterized by a deep and strongly compressed body, with vertically flattened silvery sides. This peculiar group of mesopelagic fishes consists of three extant and three extinct genera that appeared in the record in the Middle Eocene. A new genus and species o...
Echinoids fauna are common and distributed in the Lower Miocene deposits of the Bagher Abad area, northeast Isfahan, Central Iran. There are six Echinoid taxa belonging to the Echinoidea Class that can be described as: Clypeaster intermedius, Prinocidaris sp. and spines related to: Eucidaris zaemays, Stylocidaris Polyacantha, Spatangoid sp. and Pri...