Pub Date : 2024-08-03DOI: 10.1134/s003103012460032x
A. V. Mazaev
Abstract
Eleven imprints of chiton valves from the Sakmarian of the Shakhtau reef massif (Bashkir Cis-Urals) are assigned to a new species Ochmazochiton uralensis sp. nov. Previously, the genus Ochmazochiton was known only from the type species described from the Lower and Middle Permian of Texas. Due to the unique preservation of the studied material, the structure of the aesthete pores is shown for the first time, and the structure of the insertion plates, the important morphological characters of the genus Ochmazochiton, the earliest representative of the order Chitonida, is clarified.
{"title":"New Species of the Genus Ochmazochiton (Mollusca, Polyplacophora) from the Lower Permian Reef Limestones of Shakhtau (Southern Cis-Urals)","authors":"A. V. Mazaev","doi":"10.1134/s003103012460032x","DOIUrl":"https://doi.org/10.1134/s003103012460032x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Eleven imprints of chiton valves from the Sakmarian of the Shakhtau reef massif (Bashkir Cis-Urals) are assigned to a new species <i>Ochmazochiton uralensis</i> sp. nov. Previously, the genus <i>Ochmazochiton</i> was known only from the type species described from the Lower and Middle Permian of Texas. Due to the unique preservation of the studied material, the structure of the aesthete pores is shown for the first time, and the structure of the insertion plates, the important morphological characters of the genus <i>Ochmazochiton</i>, the earliest representative of the order Chitonida, is clarified.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"91 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-20DOI: 10.1134/s0031030123600099
Chung-Il Ri, Sang-Ho Kim, Yi-Dan Zhu, Xuan-Wang, Won-Hak Jo
Abstract
Dendrolites that are characterized by dendritic fabrics on the basis of mesostructure are dominated by isolated dendritic clusters of calcimicrobes and are distinct from the laminated stromatolite. Dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section in Dongping County of Shandong province make up huge microbial reef with the thickness of 60 m that are developed in the sea-level falling period, which represent a spectacularly sedimentological phenomenon. Dendrolites are made from calcimicrobes belong to fossils of the Epiphyton group and Hedstroemia group. Microscopically, the bifurcating filamentous tip show bent or broken phenomenon, and the edges of thallus received partially negligible encrustation. This can reflect biological response to extreme environments. In addition, the morphological features of shrub thalli growing upwards and the branched morphology that shows the basic dendritic growth structure in particular, truthfully show the basic characteristics of dendrolites. This phenomenon can reflect the biological properties of microorganisms trying to maintain their own growth structures. The micritic crusts may reflect that the study area dendrolites were formed by sophisticated calcification of EPS that form microbial biofilms in microbial mats dominated by cyanobacteria. Therefore, microbial reef predominated by dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section are a typical example of demonstrating the fundamental characteristics of dendrolites different from clotted thrombolite, and further, provide some clues for the study of the biological attributes and responses between microorganisms and environments.
{"title":"The Role of Cyanobacteria in the Formation of Dendrolites: An Example from the Miaolingian Dendrolites, North China","authors":"Chung-Il Ri, Sang-Ho Kim, Yi-Dan Zhu, Xuan-Wang, Won-Hak Jo","doi":"10.1134/s0031030123600099","DOIUrl":"https://doi.org/10.1134/s0031030123600099","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dendrolites that are characterized by dendritic fabrics on the basis of mesostructure are dominated by isolated dendritic clusters of calcimicrobes and are distinct from the laminated stromatolite. Dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section in Dongping County of Shandong province make up huge microbial reef with the thickness of 60 m that are developed in the sea-level falling period, which represent a spectacularly sedimentological phenomenon. Dendrolites are made from calcimicrobes belong to fossils of the <i>Epiphyton</i> group and <i>Hedstroemia</i> group. Microscopically, the bifurcating filamentous tip show bent or broken phenomenon, and the edges of thallus received partially negligible encrustation. This can reflect biological response to extreme environments. In addition, the morphological features of shrub thalli growing upwards and the branched morphology that shows the basic dendritic growth structure in particular, truthfully show the basic characteristics of dendrolites. This phenomenon can reflect the biological properties of microorganisms trying to maintain their own growth structures. The micritic crusts may reflect that the study area dendrolites were formed by sophisticated calcification of EPS that form microbial biofilms in microbial mats dominated by cyanobacteria. Therefore, microbial reef predominated by dendrolites in the top part of the Miaolingian Zhangxia Formation at the Dongping section are a typical example of demonstrating the fundamental characteristics of dendrolites different from clotted thrombolite, and further, provide some clues for the study of the biological attributes and responses between microorganisms and environments.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"158 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030123600245
A. S. Bakaev, A. V. Sergeev, N. G. Zverkov
Abstract
A dorsal vertebra of an ichthyosaur is described from the fluvial deposits of the Kama River (Votkinsk District, Udmurt Republic, Russia). This vertebra belonged to a fairly large ichthyosaur about 5–6 m long, apparently one of the largest ichthyosaurs known from European Russia. The find is redeposited, and it is problematic to establish its exact age: most likely, the vertebra was brought by the Kama River from Jurassic–Cretaceous outcrops located upstream.
{"title":"First Find of an Ichthyosaur from Udmurtia (Cis-Ural Region, Russia)","authors":"A. S. Bakaev, A. V. Sergeev, N. G. Zverkov","doi":"10.1134/s0031030123600245","DOIUrl":"https://doi.org/10.1134/s0031030123600245","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A dorsal vertebra of an ichthyosaur is described from the fluvial deposits of the Kama River (Votkinsk District, Udmurt Republic, Russia). This vertebra belonged to a fairly large ichthyosaur about 5–6 m long, apparently one of the largest ichthyosaurs known from European Russia. The find is redeposited, and it is problematic to establish its exact age: most likely, the vertebra was brought by the Kama River from Jurassic–Cretaceous outcrops located upstream.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"33 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030123600294
V. V. Mitta
Abstract
A new genus Alatyroceras is established for the species A. nageli (Mitta) (type species of the genus), A. keuppi (Mitta), A. efimovi (Mitta), and A. infimum (Gulyaev et Kiselev), in Central Russia characterizing the interval correlated with the Upper Bathonian Variabile and Calyx zones of East Greenland. According to the refined data, the Keuppi Zone of the Russian Platform includes (from bottom to top) the efimovi, nageli, and keuppi faunal horizons. The genus Alatyroceras [M] completes the phylogenetic lineage Arcticoceras → Alatyroceras in the subfamily Arctocephalitinae; the name Costacadoceras Rawson is common to all microconchs of the subfamily.
{"title":"The Genus Alatyroceras gen. nov. (Ammonoidea: Cardioceratidae, Arctocephalitinae) from the Upper Bathonian (Middle Jurassic) of the Russian Platform","authors":"V. V. Mitta","doi":"10.1134/s0031030123600294","DOIUrl":"https://doi.org/10.1134/s0031030123600294","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A new genus <i>Alatyroceras</i> is established for the species <i>A. nageli</i> (Mitta) (type species of the genus), <i>A. keuppi</i> (Mitta), <i>A. efimovi</i> (Mitta), and <i>A. infimum</i> (Gulyaev et Kiselev), in Central Russia characterizing the interval correlated with the Upper Bathonian <i>Variabile</i> and <i>Calyx</i> zones of East Greenland. According to the refined data, the <i>Keuppi</i> Zone of the Russian Platform includes (from bottom to top) the <i>efimovi</i>, <i>nageli</i>, and <i>keuppi</i> faunal horizons. The genus <i>Alatyroceras</i> [M] completes the phylogenetic lineage <i>Arcticoceras</i> → <i>Alatyroceras</i> in the subfamily Arctocephalitinae; the name <i>Costacadoceras</i> Rawson is common to all microconchs of the subfamily.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"61 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030124010040
V. V. Mitta
Abstract
The data on the taxonomic composition and stratigraphic distribution of ammonites of the families Perisphinctidae and Parkinsoniidae from the Bajocian and Lower Bathonian of the Kuban-Urup interfluve are summarized. The age of Infragarantiana primitiva (Wetzel), the oldest species of Perisphinctoidea in the Northern Caucasus originating from the Lower Bajocian Humphriesianum Zone, is clarified. New information on species of the genera Leptosphinctes, Vermisphinctes, Planisphinctes (subfamily Leptosphinctinae) and Caumontisphinctes (subfamily Parkinsoniinae) is provided.
{"title":"Superfamily Perisphinctoidea (Ammonoidea) in the Bajocian–Lower Bathonian of the Kuban River Basin (Northern Caucasus, Russia)","authors":"V. V. Mitta","doi":"10.1134/s0031030124010040","DOIUrl":"https://doi.org/10.1134/s0031030124010040","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The data on the taxonomic composition and stratigraphic distribution of ammonites of the families Perisphinctidae and Parkinsoniidae from the Bajocian and Lower Bathonian of the Kuban-Urup interfluve are summarized. The age of <i>Infragarantiana primitiva</i> (Wetzel), the oldest species of Perisphinctoidea in the Northern Caucasus originating from the Lower Bajocian <i>Humphriesianum</i> Zone, is clarified. New information on species of the genera <i>Leptosphinctes</i>, <i>Vermisphinctes</i>, <i>Planisphinctes</i> (subfamily Leptosphinctinae) and <i>Caumontisphinctes</i> (subfamily Parkinsoniinae) is provided.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"12 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s003103012401009x
Y. D. Zakharov, I. V. Borisov, O. P. Smyshlyaeva, L. G. Bondarenko, A. M. Popov
Abstract
The stratigraphic distribution of early Olenekian ammonoids of the genus Churkites (family Arctoceratidae Arthaber, 1911) from a new locality in South Primorye (Artyomovka River basin, Shtykovskie Prudy) is studied. The new species of Churkites (Ch. ungunensis sp. nov. and Ch. subungunensis sp. nov.) are described based on the material from the lower Olenekian zones of the Khabarovsk Region (T.M. Okuneva’s collection) and South Primorye. The composition of the type species of the genus Churkites (Ch. egregius Zharnikova et Okuneva, 1990) is re-defined. It is proposed to distinguish three phylogenetic lineages within the genera Arctoceras (A. tuberculatum) and Churkites (six species): (I) Arctoceras tuberculatum–Churkites noblei–Ch. egregius, (II) Ch. egregius–Ch. syaskoi and (III) Ch. syaskoi–Ch. subungunensis–Ch. ungunensis.
{"title":"Early Triassic Ammonoids of the Genus Churkites Okuneva, 1990: Phylogenetic Reconstructions and New Finds in South Primorye","authors":"Y. D. Zakharov, I. V. Borisov, O. P. Smyshlyaeva, L. G. Bondarenko, A. M. Popov","doi":"10.1134/s003103012401009x","DOIUrl":"https://doi.org/10.1134/s003103012401009x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The stratigraphic distribution of early Olenekian ammonoids of the genus <i>Churkites</i> (family Arctoceratidae Arthaber, 1911) from a new locality in South Primorye (Artyomovka River basin, Shtykovskie Prudy) is studied. The new species of <i>Churkites</i> (<i>Ch. ungunensis</i> sp. nov. and <i>Ch. subungunensis</i> sp. nov.) are described based on the material from the lower Olenekian zones of the Khabarovsk Region (T.M. Okuneva’s collection) and South Primorye. The composition of the type species of the genus <i>Churkites</i> (<i>Ch. egregius</i> Zharnikova et Okuneva, 1990) is re-defined. It is proposed to distinguish three phylogenetic lineages within the genera <i>Arctoceras</i> (<i>A. tuberculatum</i>) and <i>Churkites</i> (six species): (I) <i>Arctoceras tuberculatum</i>–<i>Churkites noblei</i>–<i>Ch. egregius</i>, (II) <i>Ch. egregius–Ch. syaskoi</i> and (III) <i>Ch. syaskoi–Ch. subungunensis–Ch. ungunensis</i>.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"24 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030123600257
A. S. Biakov
Abstract
The Late Permian pectinid species Aviculopecten volucer Lutkevich et Lobanova (Late Wuchiapingian-Early Changhsingian), previously considered to be a junior synonym of the Middle Permian Vnigripecten phosphaticus (Girty), is reinstated to a valid species. Unusual shell morphology and ornamentation of Aviculopecten volucer make it possible to assign it to a new genus Voluceropecten gen. nov. and a new monospecific family Voluceropectinidae fam. nov. An emended diagnosis of the genus Vnigripecten Muromzeva is presented.
{"title":"A New Family and Genus of Late Permian Pectinids of the Boreal Superrealm (Pectinida: Voluceropectinidae: Voluceropecten)","authors":"A. S. Biakov","doi":"10.1134/s0031030123600257","DOIUrl":"https://doi.org/10.1134/s0031030123600257","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The Late Permian pectinid species <i>Aviculopecten volucer</i> Lutkevich et Lobanova (Late Wuchiapingian-Early Changhsingian), previously considered to be a junior synonym of the Middle Permian <i>Vnigripecten phosphaticus</i> (Girty), is reinstated to a valid species. Unusual shell morphology and ornamentation of <i>Aviculopecten volucer</i> make it possible to assign it to a new genus <i>Voluceropecten</i> gen. nov. and a new monospecific family Voluceropectinidae fam. nov. An emended diagnosis of the genus <i>Vnigripecten</i> Muromzeva is presented.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"48 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030124010106
N. V. Zelenkov
Abstract
Remains of Lyrurus partium Kretzoi, 1962 and “Lagopus” atavus Jánossy, 1974 (tribe Tetraonini, family Phasianidae, order Galliformes) are described from the Lower Pleistocene of the Taurida Cave (Crimea); these are the oldest finds of the grouse in Eurasia outside of Central and Eastern Europe (Bulgaria, Hungary, and Poland). The discovery of the primitive black grouse Lyrurus partium indicates that these birds were part of the savanna-like faunal associations of the Northern Black Sea region (along with Otididae and Struthionidae) in the Early Pleistocene. The origin and evolutionary history of the modern Caucasian black grouse T. mlokosiewiczi Taczanowski, 1875 is discussed. The complete tarsometatarsus of “Lagopus” atavus from the Taurida Cave indicates a separate generic status of this poorly studied Plio-Pleistocene form, which is here transferred to the genus Paralyra gen. nov. Therefore, the presence of ptarmigans (genus Lagopus) in the preglacial Plio-Pleistocene faunas of Eastern Europe is not confirmed.
{"title":"Grouse (Aves: Phasianidae: Tetraonini) from the Early Pleistocene of Crimea, and the Taxonomic Status of Lagopus atavus","authors":"N. V. Zelenkov","doi":"10.1134/s0031030124010106","DOIUrl":"https://doi.org/10.1134/s0031030124010106","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Remains of <i>Lyrurus partium</i> Kretzoi, 1962 and “<i>Lagopus</i>” <i>atavus</i> Jánossy, 1974 (tribe Tetraonini, family Phasianidae, order Galliformes) are described from the Lower Pleistocene of the Taurida Cave (Crimea); these are the oldest finds of the grouse in Eurasia outside of Central and Eastern Europe (Bulgaria, Hungary, and Poland). The discovery of the primitive black grouse <i>Lyrurus partium</i> indicates that these birds were part of the savanna-like faunal associations of the Northern Black Sea region (along with Otididae and Struthionidae) in the Early Pleistocene. The origin and evolutionary history of the modern Caucasian black grouse <i>T. mlokosiewiczi</i> Taczanowski, 1875 is discussed. The complete tarsometatarsus of “<i>Lagopus</i>” <i>atavus</i> from the Taurida Cave indicates a separate generic status of this poorly studied Plio-Pleistocene form, which is here transferred to the genus <i>Paralyra</i> gen. nov. Therefore, the presence of ptarmigans (genus <i>Lagopus</i>) in the preglacial Plio-Pleistocene faunas of Eastern Europe is not confirmed.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"16 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030123600233
M. S. Afanasieva
Abstract
There are important morphological differences between the dominant higher taxa (classes) in associations of radiolarians that inhabited different depths of paleobasins. A similar inversion of dominant radiolarian taxa can be seen in the Early Tournaisian (Mississippian) and the Kungurian (Cisuralian) and may indicate a change in their habitat from deeper conditions dominated by porous Sphaerellaria, to shallower shelf environments, in which spongy-lattice Spumellaria prevailed.
{"title":"Patterns of Change in Radiolarian Associations in the Early Tournaisian (Mississippian) and Kungurian (Cisuralian) in Eastern European Russia","authors":"M. S. Afanasieva","doi":"10.1134/s0031030123600233","DOIUrl":"https://doi.org/10.1134/s0031030123600233","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>There are important morphological differences between the dominant higher taxa (classes) in associations of radiolarians that inhabited different depths of paleobasins. A similar inversion of dominant radiolarian taxa can be seen in the Early Tournaisian (Mississippian) and the Kungurian (Cisuralian) and may indicate a change in their habitat from deeper conditions dominated by porous Sphaerellaria, to shallower shelf environments, in which spongy-lattice Spumellaria prevailed.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"163 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-16DOI: 10.1134/s0031030123600270
D. V. Kochergin, N. V. Granovskaya
Abstract
A silicite horizon corresponding to the global catastrophic event at the Cretaceous–Paleogene boundary was found for the first time in the flysch sequence of the Shapsug section on the southern slope of the Northwest Caucasus. Assemblages of radiolarians and planktonic foraminifers dating the host beds were identified. Mineralogical and analytical data support the presence of tectites, impact minerals, and increased iridium content in the boundary bed of the studied section.
{"title":"The Cretaceous–Paleogene Boundary in the Shapsug Section (Southern Slope of the Northwestern Caucasus)","authors":"D. V. Kochergin, N. V. Granovskaya","doi":"10.1134/s0031030123600270","DOIUrl":"https://doi.org/10.1134/s0031030123600270","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A silicite horizon corresponding to the global catastrophic event at the Cretaceous–Paleogene boundary was found for the first time in the flysch sequence of the Shapsug section on the southern slope of the Northwest Caucasus. Assemblages of radiolarians and planktonic foraminifers dating the host beds were identified. Mineralogical and analytical data support the presence of tectites, impact minerals, and increased iridium content in the boundary bed of the studied section.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"82 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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