Leonid E. Popov

Leonid E. Popov
National Museum Wales · Department of Natural Sciences

PhD, DSc

About

311
Publications
64,326
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5,621
Citations
Additional affiliations
July 2013 - July 2015
National Museum Wales
Position
  • Researcher
March 1997 - December 2012
National Museum Wales
August 1993 - March 1997

Publications

Publications (311)
Article
Full-text available
The Cambrian successions at the Chihuarruita Hill outcrop, Sonora, Mexico, have yielded two successive linguliform brachiopod assemblages that are transitional between Cambrian Stage 4 and the newly recognized global Wuliuan Stage. The lowermost assemblage includes Dictyonina sp., Paterina sp., Eothele sp., Hadrotreta rara ? (Cooper), and Linnarsso...
Chapter
Chu‐Ili, now in Kazakhstan, was a substantial independent equatorial microcontinental terrane in Ordovician times, with a small Precambrian core fringed by several island arcs. Its mid‐Ordovician (late Darriwilian to early Katian) faunas were a major evolutionary hotspot within an equatorial archipelago at a period when Palaeozoic sea levels and te...
Article
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Two massive precipitation events of polymetallic ore deposits, encrusted by a mixture of authigenic carbonates, are documented from the Cambrian of the semi-enclosed Baltoscandian Basin. δ34S (‒9.33 to ‒2.08‰) and δ33S (‒4.75 to ‒1.06‰) values from the basal sulphide breccias, sourced from contemporaneous Pb–Zn–Fe-bearing vein stockworks, refect su...
Article
Recent reconnaissance geological mapping, identification of unconformities and chronostratigraphic dating of Miaolingian to Ordovician strata in the eastern Alborz Mountains have led to recognition of synsedimentary uplift episodes associated with block tilting and partial erosion of the Cambrian Mila and Ordovician Simeh Kuh, Qumes and Lashkarak f...
Article
During the Early Ordovician Epoch, the Mediterranean brachiopod Province was extensive in the higher-latitude sectors of the globe in the Southern Hemisphere. The latter was much occupied by the massive continent of Gondwana, which stretched from north of the Equator S-wards to cover the South Pole. The Mediterranean Province can be separated into...
Article
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Graptolites have been collected from sections through Lower Ordovician strata in northern Iran. At the Saluk Mountains, in the Kopet–Dagh region, mudrocks yielded fragmentary tubaria of Rhabdinopora sp. cf. R. flabelliformis , indicating the presence of lower Tremadocian strata there; stratigraphically, they lie between two limestone beds with the...
Article
The Silurian (Aeronian) post-extinction recovery brachiopod fauna of Iran and Afghanistan is characterized by a proliferation of the Stegocornu Brachiopod Association, which includes prominent endemic rhynchonellide and spiriferide components. A local variety of that association, recently recovered from the Shabdjereh Formation of Kerman Province,...
Article
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An assemblage of orthoconic cephalopods collected from oolitic ironstones at the base of the Pelmis Formation (New) of the Saluk Mountains of the southern Kopet-Dahg Region of north-eastern Iran indicate that the base of the Pelmis Formation is likely to be Darriwilian in age. Preservation of the assemblage suggests that it is time averaged and may...
Article
The first Cambrian (Miaolingian to Furongian) rhynchonelliform brachiopods are described from the Chingiz–Tarbagatai early Palaeozoic island arc system in eastern Central Kazakhstan. The Miaolingian (Wuliuan) assemblage from the volcano-sedimentary Athei Formation includes the kutorginide Bellistrophia askarensis sp. nov. Popov and Nikitina, protor...
Article
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Keywords Ordovician Orbital forcing Astrochronology Cyclostratigraphy Biostratigraphy Review of current progress in Mid to Late Ordovician astrochronological studies exposes some important issues related to cyclostratigraphical studies, including the completeness and correlation of successions, and the connection between inferred astronomical cycle...
Article
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Limestones of the Xihaoping Member of the Dengying Formation in the Xiaoyangba section, South China, yield the oldest known Cambrian brachiopod–trilobite association. In this member, the trilobite Parabadiella cf. huoi co-occurs with the new brachiopod species Eoobolus incipiens sp. nov. The association provides potential for correlation of lower C...
Article
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A moderately diverse assemblage of micromor-phic linguliform brachiopods, including Tapuritreta gri-bovensis sp. nov., Wahwahlingula? pankovensis sp. nov., Acrothele sp., Anabolotreta? sp., Orbithele? sp. and Stilp-notreta sp., is for the first time described from the Cam-brian Karpinsk Formation (Miaolingian, Guzhangian) of the South Island of Nov...
Article
The Early Ordovician brachiopods of south-west Wales (Pembrokeshire and Carmarthenshire) are identified, in most cases for the first time. That period is termed the local Arenig Stage in Britain, but it is now correlated with the Floian, Dapingian, and earlier half of the Darriwilian, which are more recently established international stages in the...
Article
A moderately diverse Early Devonian (Lochkovian) trilobite and brachiopod association has been recovered from the lower part of the volcano-sedimentary Shakshagaily Formation, exposed on the western side of Lake Balkhash in central Kazakhstan. Its discovery demonstrates the presence of Lower Devonian marine deposits in the region. The trilobite ass...
Article
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The Tremadocian (Early Ordovician) is currently considered a time span of greenhouse conditions with tropical water surface temperature estimates, interpolated from oxygen isotopes, approaching 40 °C. In the mid-latitude Baltoscandian Basin, conodonts displaying low δ18O values, which suggest high temperatures (>40 °C) in the water column, are in c...
Article
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In the Mid to Late Ordovician the area of the Ougarta Range in north-west Africa occupied a position in relative proximity to the South Pole. Eight successive low diversity brachiopod faunas, including the lingulide association dominated by unnamed species of Lingulobolus, the Darriwilian ?Sivorthis fraterna and Tissintia convergens, the Sandbian t...
Article
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A comprehensive review and phylogenetic analysis of genera and species presently assigned to the rhyn-chonelliform superfamily Nisusioidea and family Nisusiidae suggests that this short-lived but important group of bra-chiopods first appeared in peri-Gondwana during the second half of the Cambrian Series 2, before going extinct by the end of Drumia...
Preprint
Full-text available
The Tremadocian (Early Ordovician) is currently considered a time span of greenhouse conditions with tropical water surface temperature estimates, interpolated from oxygen isotopes, approaching 40°C. In the high-latitude Baltoscandian Basin, these data are in contrast with the discovery of glendonite, a pseudomorph of ikaite (CaCO3·6H2O) and valuab...
Article
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The Late Devonian (late Famennian) phacopid trilobites represented by Omegops tilabadensis sp. nov. are described and illustrated from the Khoshyeilaq Formation, eastern Alborz Mountains, North Iran. The species formed a monotaxic trilobite association inhabiting a shallow shelf together with diverse brachiopod communities dominated by the athyridi...
Article
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Background: Our understanding of the ontogeny of Palaeozoic brachiopods has changed significantly during the last two decades. However, the micromorphic acrotretoids have received relatively little attention, resulting in a poor knowledge of their ontogeny, origin and earliest evolution. The uniquely well preserved early Cambrian fossil records in...
Article
Exceptionally preserved, silicified and articulated complete shells of the rhynchonelliform kutorginate brachiopod Nisusia sulcata are redescribed from the middle Cambrian (Series 3) Marjum Limestone, Utah. Cylindroid sausage-like protrusions, emerging posteriorly between the valves, were originally interpreted as faecal in origin, but restudy unde...
Article
The secular increase in δ¹⁸O values of both calcitic and phosphatic marine fossils through early Phanerozoic time suggests either that (1) early Paleozoic surface temperatures were high, in excess of 40 °C (tropical MAT), (2) the δ¹⁸O value of seawater has increased by 7–8‰ VSMOW through Paleozoic time, or (3) diagenesis has altered secular trends...
Article
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Middle Ordovician (Darriwilian) monothalamous agglutinated foraminifers are described for the first time from strata of the Lashkarak Formation of the Simeh-Kuh section, Alborz Mountains, northern Iran. One new genus Damghanites Nestell and Ghobadi Pour with the type species D. lashkarakensis, and three new species Amphitremoida simehkuhensis, Soro...
Article
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The kutorginates are commonly the most abundant rhynchonelliform brachiopod found in the early Cambrian; they are also some of the oldest known rhynchonelliforms, first appearing in the Unnamed Series 2 (Atdabanian equivalent) and becoming extinct sometime in Cambrian Series 3 (Amgaian equivalent). Moreover, kutorginates are the first known member...
Article
Popov, L.E. and Cocks, L.R.M. 2017. Late Ordovician palaeogeography and the positions of the Kazakh ter-ranes through analysis of their brachiopod faunas. Acta Geologica Polonica, 67 (3), 323–380. Warszawa. Detailed biogeographical and biofacies analyses of the Late Ordovician brachiopod faunas with 160 genera, grouped into 94 faunas from individua...
Article
Two trilobite faunas of Late Ordovician (Katian) age are described from the Mayatas Formation in the Stepnyak region of north-central Kazakhstan. The older, oligotaxic fauna derives from flanks of a carbonate build-up, and is dominated by numerous Sphaerexochus specimens. Amphilichas is also relatively common, with Pliomerina and indeterminate asap...
Article
A new brachiopod genus and species Simehorthis fascicostellata is described from the upper Darriwilian part of the Lashkarak Formation of eastern Alborz in northern Iran. The taxon appears as a minor component of the Saucrorthis Brachiopod Association and later proliferated as a distinct part of a rich brachiopod-echinoderm fauna in the latest Darr...
Article
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Despite many major advances in recent years, three key challenges remain in bringing clarity to the early history of the phylum: (1) identifying the origin, morphology and life modes of the first brachiopods; (2) understanding the relationships of the major groups to each other and higher sister taxa; and (3) unravelling the roles of the Cambrian a...
Article
A characteristic coarsely pitted ornamentation (with pits larger than 0.015 mm across) can be found on some very enigmatic and rare Lower Ordovician phosphatic-shelled linguliform brachiopods, including the paterinid Lacunites balaschovae Gorjansky and the obolid Foveola maarduensis Gorjansky. Both of these species are poorly understood and known f...
Article
Rocks previously mapped as Devonian at Gerd-Kuh in the Eastern Alborz Mountains of Iran have yielded Middle Ordovician faunas including the brachiopods described here, the first rhynchonelliform brachiopods of Dapingian age ever described from Iran. The shells described are defined as a new Dirafinesquina Benthic Association, and which is the secon...
Article
Well-preserved juvenile specimens of the orthotetide brachiopod Coolinia pecten (Linnaeus, 1758) from the Silurian of Gotland, Sweden, demonstrate evidence of a planktotrophic larval habit. Larval shell morphology indicates the absence of a pedicle sheath: this character is otherwise typical of derived billingsellides, strophomenides and productide...
Article
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Ordovician (Darriwilian to Sandbian) micromorphic linguliform lingulate brachiopods are described from the Guniutan Formation at the Fenxiang section in Hubei province, and the Maocaopu and Cili sections in Hunan province of south-central China, situated on the Yangtze Platform. A total of 7560 specimens from 155 limestone samples (within the inter...
Article
A low diversity brachiopod fauna including Meristella? aksuensis sp. nov., Ouraniorhynchus dronovi gen. et. sp. nov., Nikiforovaena sp., Nucleospira sp., and Protathyris sp. aff. P. sibirica, has been recovered from quartzites assigned to the Burak Member. It is suggested the presence of Early Devonian (Lochkovian) deposits not previously reported...
Article
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The Silurian biostratigraphy, lithostratigraphy, and facies of Central Iran including the Kashmar (Boghu Mountains), Tabas (Derenjal Mountains, Ozbak-Kuh), Anarak (Pol-e Khavand) and Kerman regions is reviewed and updated. The current state of knowledge of the Silurian in the Zagros Basin, Alborz, Kopet-Dagh and Talysh regions, as well as in a few...
Article
The near planispiral euomphaloid gastropod Lesueurilla prima (Barrande in Perner) is a typical part of the cold water Mediterranean fauna in the Lower and Middle Ordovician. It is a signature species in strata of this age in the Prague Basin in the Czech Republic, Montagne Noire in France, and Central Morocco. The species is reported for the first...
Article
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The first Ordovician micromorphic linguliform brachiopods are described from the Province of Mendoza of west-central Argentina. The focus of the study is on carbonate successions exposed in the San Rafael Block, south of the famous Precordillera of San Juan, La Rioja and Mendoza representing the largest area of the so-called Cuyania Terrane. In the...
Article
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Sixteen rhynchonelliform brachiopod taxa, including Anisopleurella antiqua n. sp., Bellimurina fluctuosa n. sp., Dulankarella hyrcanica n. sp., Lepidomena multiplicata n. sp., Orthis dehmollaensis n. sp., Phragmorthis shahrudensis n. sp., and Rogorthis? oriens n. sp., are documented from the lower part of the Lashkarak Formation (Darriwilian, Lenod...
Article
The Early Triassic (late Induan to early Olenekian) Lingula borealis Bittner, from the Russkii Island on the Pacific cost of south-eastern Russia is revised, based on re-examination of the type material. Although this species, like most described Triassic lingulids, has remained very poorly understood due to the lack of information on important cha...
Article
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The Ordovician sedimentary succession of the Pol-e Khavand area, situated on the northern margin of the Yazd block, has important differences from those in other parts of Central Iran. It has been established that the presumably terminal Cambrian to Lower Ordovician volcano-sedimentary Polekhavand Formation, exposed in the Pol-e Khavand area, has n...
Article
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The study of the Upper Ordovician in the Faraghan Mountains, southeastern Iran, reveals for the first time the presence of a low-diversity trilobite fauna in the middle member of the Seyahou Formation. Five genera and nine species have been identified, including Dalmanitina (. Dalmanitina) dargazensis nov. sp. Four species are described under open...
Article
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Ghavidel-Syooki, M., Evans, D.H., Ghobadi Pour, M., Popov, L.E., alvaro, J.J., Rakhmonov, U., Klishevich, I.A. & Ehsani, M.D., 15.5.2015. Late Ordovician cephalopods, tentaculitides, machaeridians and echinoderm columnals from Kuh-e Faraghun, High Zagros, Iran. Alcheringa 39, 530-549. ISSN 0311-5518.Late Ordovician (Katian, uppermost Acanthochitina...
Article
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Restudy of the Cambrian–Ordovician boundary beds, traditionally assigned to the Mila Formation Member 5 in Mila- Kuh, northern Iran, for the first time provides convincing evidence of the Early Ordovician (Tremadocian) age of the uppermost part of the Mila Formation. Two succeeding trilobite assemblages typifying the Asaphellus inflatus–Dactyloceph...
Article
Full-text available
The Pole Khavand area southeast of the town of Anarak preserves important clues for understanding geological evolution of Central Iran during the Palaeozoic. New observations confirm the non-conformable relationship between Doshakh metamorphites and overlying unmetamorphosed Lower Palaeozoic sediments, suggesting accretion of the volcanic arc in fr...
Article
A synoptic analysis of previously published material and new finds reveals that Himalayan Cambrian brachiopods can be referred to 18 genera, of which 17 are considered herein. These contain 20 taxa assigned to species, of which five are new: Eohadrotreta haydeni, Aphelotreta khemangarensis, Hadrotreta timchristiorum, Prototreta? sumnaensis and Amic...
Article
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Brachiopods are among the most common components of the Late Ordovician benthic faunal assemblages recorded in the Faraghan Mountains, Zagros Ranges, Iran. A total of 19 species referable to 16 genera are identified, including seven new species; namely Drabovia elegans, Hibernodonta bonehensis, Hedstroemina zakeenensis, Jezercia faraghani, Protomen...
Article
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The cephalopod fauna from the Aeronian Qarebil Limestone of northeastern Iran comprises the first comprehensive record of early Silurian cephalopods from peri-Gondwana. Although consisting of relatively few taxa, the assemblage includes members of the orders Oncocerida, Discosorida, Barrandeocerida and Orthocerida. Coeval records of several of thes...
Article
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A continuous succession comprising upper Cambrian (Furongian) to Lower Ordovician (Tremadocian) conodont biozones is reported for the first time from the Kopet-Dagh Region of northeastern Iran. Seven biostratigraphical units are recognized, including the Proconodontus tenuiserratus and Proconodontus posterocostatus zones; these two lowermost bio...
Article
Full-text available
The Tremadocian of the East Alborz Region is dominated by condensed fine clastic sediments. These beds have yielded low to medium diversity trilobite associations, which belong to the olenid, nileid and raphiophorid biofacies, characteristic of an outer shelf environment. Five successive trilobite biozones can be recognised in the Tremadocian su...
Article
Full-text available
A continuous succession comprising upper Cambrian (Furongian) to Lower Ordovician (Tremadocian) conodont biozones is reported for the first time from the Kopet-Dagh Region of northeastern Iran. Seven biostratigraphical units are recognized, including the Proconodontus tenuiserratus and Proconodontus posterocostatus zones; these two lowermost bio...
Article
Full-text available
A continuous succession comprising upper Cambrian (Furongian) to Lower Ordovician (Tremadocian) conodont biozones is reported for the first time from the Kopet-Dagh Region of northeastern Iran. Seven biostratigraphical units are recognized, including the Proconodontus tenuiserratus and Proconodontus posterocostatus zones; these two lowermost biostr...
Article
Full-text available
The Tremadocian of the East Alborz Region is dominated by condensed fine clastic sediments. These beds have yielded low to medium diversity trilobite associations, which belong to the olenid, nileid and raphiophorid biofacies, characteristic of an outer shelf environment. Five successive trilobite biozones can be recognised in the Tremadocian succe...
Article
Full-text available
ABSTRACT: Brachiopods are among the most common components of the Late Ordovician benthic faunal assemblages recorded in the Faraghan Mountains, Zagros Ranges, Iran. A total of 19 species referable to 16 genera are identified, including seven new species; namely Drabovia elegans, Hibernodonta bonehensis, Hedstroemina zakeenensis, Jezercia faraghani...
Article
Full-text available
Restudy of the Cambrian–Ordovician boundary beds, traditionally assigned to the Mila Formation Member 5 in Mila-Kuh, northern Iran, for the first time provides convincing evidence of the Early Ordovician (Tremadocian) age of the uppermost part of the Mila Formation. Two succeeding trilobite assemblages typifying the Asaphellus inflatus–Dactylocepha...