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Upper Miocene deposits at the southern margin of the Guadalquivir Foreland Basin (central Betic Cordillera, S. Spain). Implications for the closure timing of the Atlantic-Mediterranean connections 瓜达尔基维尔前陆盆地南缘上中新世沉积(西班牙南部贝提克山脉中部)。对大西洋-地中海航线关闭时间的影响
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REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-10-01 DOI: 10.1016/j.revmic.2022.100690
Julio Aguirre , Juan C. Braga , José A. Martín-Pérez , José M. Martín , Ángel Puga-Bernabéu
{"title":"Upper Miocene deposits at the southern margin of the Guadalquivir Foreland Basin (central Betic Cordillera, S. Spain). Implications for the closure timing of the Atlantic-Mediterranean connections","authors":"Julio Aguirre ,&nbsp;Juan C. Braga ,&nbsp;José A. Martín-Pérez ,&nbsp;José M. Martín ,&nbsp;Ángel Puga-Bernabéu","doi":"10.1016/j.revmic.2022.100690","DOIUrl":"10.1016/j.revmic.2022.100690","url":null,"abstract":"<div><p>Mixed siliciclastic-carbonate deposits accumulated in several satellite sub-basins at the southern margin of the Guadalquivir Basin, the foreland basin of the Betic Cordillera (S. Spain). The prevailing coarse-grained sediments and deposition in shallow-water settings make it difficult to establish the precise age of the complete successions. For this reason, in previous studies, these deposits were attributed to the late Tortonian, although a Messinian age was not totally ruled out. The age of the upper Miocene deposits in the central part of the Guadalquivir Basin is here re-evaluated based on the analysis of several sections distributed in different areas: Antequera, Iznájar-Cuevas de San Marcos, Teba, and Bobadilla Estación. According to planktonic foraminifer and nannoplankton assemblages, the marine sedimentary infill of this sector of the southern margin of the Guadalquivir Basin is late Tortonian-early Messinian (late Miocene) in age. The occurrence of marine deposits characterized by the dominance of <em>Globorotalia miotumida</em> group, dextrally-coiled <em>G. scitula</em>, and the presence of <em>G. margaritae, Globigerina multiloba, Discoaster quinqueramus, Amaurolithus primus, A. amplificus</em>, and <em>Reticulofenestra rotaria</em> at the northern end of the Guadalhorce Corridor, the last active gateway in the Betic Cordillera connecting the Atlantic and the Mediterranean, indicates that it remained open until the early Messinian.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"76 ","pages":"Article 100690"},"PeriodicalIF":0.9,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S003515982200085X/pdfft?md5=10d87cb7bc53bdd2e6588e83368a0b3a&pid=1-s2.0-S003515982200085X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115612796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Uvigerina agglutinata n.sp. a new Holocene benthic foraminifer with an outer agglutinated layer from the central Red Sea 凝集绒毛菌一种新的全新世底栖有孔虫,外层有黏结层,来自红海中部
IF 0.9
REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-10-01 DOI: 10.1016/j.revmic.2022.100689
Abduljamiu O. Amao , Mashaer A. Alfaraj , Michael A. Kaminski
{"title":"Uvigerina agglutinata n.sp. a new Holocene benthic foraminifer with an outer agglutinated layer from the central Red Sea","authors":"Abduljamiu O. Amao ,&nbsp;Mashaer A. Alfaraj ,&nbsp;Michael A. Kaminski","doi":"10.1016/j.revmic.2022.100689","DOIUrl":"10.1016/j.revmic.2022.100689","url":null,"abstract":"<div><p><span>This paper describes a new deep-sea foraminifer which has possibly evolved a way to use sediment particles from its surroundings to increase its density. The benthic foraminifer recovered from Red Sea planktonic ooze shares some similarities with two well-established </span><em>Uvigerina</em> species <em>Uvigerina auberiana</em> d'Orbigny, 1826 and the extinct <em>Uvigerina auberiana var. attenuata</em> Cushman &amp; Renz, 1941. However, it differs from the two species mainly by the incorporation of sediment grains into its external wall. <em>Uvigerina agglutinata</em><span> n.sp. is characterized by its initially triserial coiling, which changes to biserial in the middle part and eventually becomes uniserial in final whorl. The most diagnostic feature of this species is the incorporation of different shapes and sizes of detrital calcium carbonate grains into its outer wall.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"76 ","pages":"Article 100689"},"PeriodicalIF":0.9,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114147279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Neorbitolinopsis conica (Matsumaru in Matsumaru and Furusawa, 2007) comb. nov., a Lower Cretaceous marker from the Orbitolina Limestone of Central Iran Neorbitolinopsis conica (Matsumaru in Matsumaru and Furusawa, 2007)梳子。11月,伊朗中部Orbitolina石灰岩的下白垩统标志
IF 0.9
REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-07-01 DOI: 10.1016/j.revmic.2022.100680
Felix Schlagintweit , Koorosh Rashidi
{"title":"Neorbitolinopsis conica (Matsumaru in Matsumaru and Furusawa, 2007) comb. nov., a Lower Cretaceous marker from the Orbitolina Limestone of Central Iran","authors":"Felix Schlagintweit ,&nbsp;Koorosh Rashidi","doi":"10.1016/j.revmic.2022.100680","DOIUrl":"10.1016/j.revmic.2022.100680","url":null,"abstract":"<div><p><span>New biostratigraphic data about the Lower Cretaceous “</span><em>Orbitolina</em> limestone” (Shah Kuh Formation) that transgressively overlies the Anarak Metamorphic Complex in Central Iran is provided from a section near Anarak. The presence of the <em>Praeorbitolina</em><span> biozone at the base documents an early Aptian age. In the late Aptian, the “</span><em>Orbitolina</em><span> limestone” is topped by an emersion surface. This level/event might correspond to the beginning of the supra-regional late Aptian sea-level lowstand. It is followed by carbonates ascribed to the Albian Bazyab Formation, although no precise age indicator has been observed. From the Shah Kuh Formation, the previously unrecorded species </span><em>Paleodictyoconus conica</em> (rect. <em>conicus</em>) Matsumaru in Matsumaru and Furusawa, 2007 (early-late Aptian of Japan) is described and taxonomically revised as <em>Neorbitolinopsis conica</em> (Matsumaru) comb. nov. A literature review (including other records from Iran under different names or in open nomenclature) leads to the conclusion that <em>Neorbitolinopsis conica</em> represents a marker for the upper Bedoulian to Gargasian stratigraphic interval in this area. The studied section also provides the first record of <em>Palorbitolinoides</em> Cherchi &amp; Schroeder from the early Aptian of Central Iran.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"75 ","pages":"Article 100680"},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129649971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Ostracoda (Crustacea) from the Lower Jurassic of northeastern Thailand: stratigraphic and paleoenvironmental implications 泰国东北部下侏罗统介形类(甲壳类):地层和古环境意义
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REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-07-01 DOI: 10.1016/j.revmic.2022.100611
Anisong Chitnarin , Rattanaphorn Hanta , Patteera Ketmuangmoon , Marie-Béatrice Forel
{"title":"Ostracoda (Crustacea) from the Lower Jurassic of northeastern Thailand: stratigraphic and paleoenvironmental implications","authors":"Anisong Chitnarin ,&nbsp;Rattanaphorn Hanta ,&nbsp;Patteera Ketmuangmoon ,&nbsp;Marie-Béatrice Forel","doi":"10.1016/j.revmic.2022.100611","DOIUrl":"10.1016/j.revmic.2022.100611","url":null,"abstract":"<div><p><span>Freshwater ostracods were recovered from limestone strata belonging to the Nam Phong Formation exposed at Ban Non Tum section in Chaiyaphum Province, northeastern Thailand. The examined rocks were collected above the oldest known dinosaur footprints site in Thailand. All recovered ostracods belong to the Superfamily Darwinuloidea and were attributed to three species: </span><em>Suchonellina sarytirmensis</em> (Sharapova) in Mandelstam, 1947, <em>Suchonellina.</em> sp. A and <em>Suchonellina</em> sp. B<em>.</em><span> The ostracods represent the first known record of Jurassic darwinuloideans in Southeast Asia. The ostracod assemblage and microfacies are indicative of deposition in a shallow and low energy fluvio-lacustrine regime.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"75 ","pages":"Article 100611"},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132460671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Latentifistularia and other radiolarian species from the lower Smithian (Lower Triassic) Lang Son Formation, NE Vietnam 越南东北部下史密斯(下三叠统)谅山组的潜瘘虫和其他放射虫种
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REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-07-01 DOI: 10.1016/j.revmic.2022.100610
Osamu Takahashi , Takumi Maekawa , Paulian Dumitrica , Phong Duc Nguyen , Toshifumi Komatsu
{"title":"Latentifistularia and other radiolarian species from the lower Smithian (Lower Triassic) Lang Son Formation, NE Vietnam","authors":"Osamu Takahashi ,&nbsp;Takumi Maekawa ,&nbsp;Paulian Dumitrica ,&nbsp;Phong Duc Nguyen ,&nbsp;Toshifumi Komatsu","doi":"10.1016/j.revmic.2022.100610","DOIUrl":"10.1016/j.revmic.2022.100610","url":null,"abstract":"<div><p><span><span><span>Well-preserved Early Triassic </span>radiolarians were recovered from lower Smithian (lower Olenekian) beds in NE Vietnam. The radiolarian assemblage consists only of Paleozoic </span>relict species of Latentifistularia and some entactinarians. Three latentifistularian species, </span><em>Ruzhencevispongus vietnamensis</em> nov. sp., <em>Tetragregnon chilangensis</em> nov. sp., and <em>Tetragregnon langsonensis</em><span> nov. sp., belonging to the families Ruzhencevispongidae Kozur and Tetratormentidae Nestell and Nestell are erected herein. The entactinarian family Triassothamnidae nov. fam. and one new genus and two new species of </span><em>Langsonsphaera pseudocubica</em> nov. gen. nov. sp. and <em>Stigmosphaerostylus amabilis</em> nov. sp. are also described. In this region, the Paleozoic-type radiolarian groups Latentifistularia and Entactinaria survived across the Permian–Triassic boundary and were present during the Induan–early Olenekian interval. Thus, in the eastern Tethyan seaway near the equator, the true extinction of some Paleozoic radiolarian groups took place at the middle of the Early Triassic, immediately after the Smithian, rather than during the Permian–Triassic crisis.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"75 ","pages":"Article 100610"},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132211339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
What's in a name? Revision of Peneroplis turonicus Said and Kenawy, 1957 (benthic foraminifera), an inappropriately-named taxon from the Cenomanian of the southern Neotethys margin 名字里有什么?Peneroplis turonicus Said and Kenawy, 1957(底栖有孔虫目),新特提斯南缘Cenomanian的一个命名不适当的分类群
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REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-07-01 DOI: 10.1016/j.revmic.2022.100612
Felix Schlagintweit , Mohsen Yazdi-Moghadam
{"title":"What's in a name? Revision of Peneroplis turonicus Said and Kenawy, 1957 (benthic foraminifera), an inappropriately-named taxon from the Cenomanian of the southern Neotethys margin","authors":"Felix Schlagintweit ,&nbsp;Mohsen Yazdi-Moghadam","doi":"10.1016/j.revmic.2022.100612","DOIUrl":"10.1016/j.revmic.2022.100612","url":null,"abstract":"<div><p><em>Peneroplis turonicus</em><span><span> Said and Kenawy is a poorly known benthic foraminifer that was originally described based on isolated specimens from the </span>Upper Cretaceous<span> of Egypt. Specimens from the Cenomanian Sarvak Formation of Iran indicate the presence of a finely agglutinated test wall displaying a pseudo-keriothecal texture, therefore, excluding this taxon from the porcelaneous Miliolida, namely family Peneroplidae. Based on the test morphology, wall structure and foraminal features, the species is herein tentatively assigned to </span></span><em>Neodubrovnikella</em> Schlagintweit and Rashidi (order Loftusiida), with the new combination <em>Neodubrovnikella turonica</em> (Said and Kenawy). A critical literature review leads to the conclusion that <em>N. turonica</em> represents a southern Neotethys Cenomanian marker taxon reported so far from Italy, Slovenia, Croatia, Kosovo, Greece, Lebanon, Syria, Morocco, Egypt, Turkey, Iraq, and Iran. Therefore, <em>Neodubrovnikella</em><span> does not represent a Maastrichtian genus as previously assumed but is as old as Cenomanian, disappeared from the fossil record in the proximity of the Cenomanian-Turonian boundary and reappeared after a considerable gap and ghost range.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"75 ","pages":"Article 100612"},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131696908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Diversity of polycystine radiolarians in sediment traps from the Ionian, North Aegean and Cretan Seas: A preliminary account 爱奥尼亚、北爱琴海和克里特海沉积物圈闭中多胱氨酸放射虫的多样性:初步说明
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REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-04-01 DOI: 10.1016/j.revmic.2022.100606
Taniel Danelian , Mathias Meunier , Martin Tetard , Elisavet Skampa , Maria Triantaphyllou , Spyros Stavrakakis , Alexandra Gogou
{"title":"Diversity of polycystine radiolarians in sediment traps from the Ionian, North Aegean and Cretan Seas: A preliminary account","authors":"Taniel Danelian ,&nbsp;Mathias Meunier ,&nbsp;Martin Tetard ,&nbsp;Elisavet Skampa ,&nbsp;Maria Triantaphyllou ,&nbsp;Spyros Stavrakakis ,&nbsp;Alexandra Gogou","doi":"10.1016/j.revmic.2022.100606","DOIUrl":"10.1016/j.revmic.2022.100606","url":null,"abstract":"<div><p><span>The presence and diversity of polycystine radiolarians<span><span> in the North-Eastern Mediterranean Sea is explored for the first time through the analysis of sinking particles obtained from sediment traps moored in three open marine sites. In total, thirty species are identified for which we provide appropriate references and illustrations to clarify the species concept followed in this study; 13 of the identified species are Spumellarians, 16 are Nassellarians and one is an Entactinarian. The highest diversity is recorded in the Ionian site, in which 23 species were observed during November 2014, with approximately as many Nassellarian species as Spumellarians; a large number of species are in common with the fauna reported from the </span>Adriatic Sea, off Dubrovnik, but interestingly, 16 others are not. The lowest levels of radiolarian diversity, with 3 to 4 species at best, were observed in the north Aegean and Cretan Sea sites. Our observations improve also the paleobiogeographic knowledge of two polycystine species, one of which (</span></span><em>Gonosphaera primordialis</em><span> Jørgensen) was known previously from the high latitudes of both the northern and southern hemisphere and the other (</span><em>Qiuripylolena chikuchik</em> Zhang and Suzuki) from the Pacific ocean.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"74 ","pages":"Article 100606"},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122467260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Non-marine ostracods from the Late Jurassic–Early Cretaceous of Araripe, Jatobá and Tucano Norte basins, northeast Brazil Ostracodes non marins Jurassique Superieur–Cretace Inferieur des bassins d'Araripe, Jatobá et Tucano Norte, nord-est Bresil Araripe晚侏罗纪-早白垩世非海洋介形虫,jatoba和Tucano Norte basins,巴西东北部Araripe盆地上侏罗纪-下白垩世非海洋介形虫,jatoba和Tucano Norte,巴西东北部
IF 0.9
REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-04-01 DOI: 10.1016/j.revmic.2022.100605
Débora Soares Almeida-Lima , Enelise Katia Piovesan , Juliana Guzmán , Daniele de Melo Mendes , Virgínio Henrique de Miranda Lopes Neumann
{"title":"Non-marine ostracods from the Late Jurassic–Early Cretaceous of Araripe, Jatobá and Tucano Norte basins, northeast Brazil Ostracodes non marins Jurassique Superieur–Cretace Inferieur des bassins d'Araripe, Jatobá et Tucano Norte, nord-est Bresil","authors":"Débora Soares Almeida-Lima ,&nbsp;Enelise Katia Piovesan ,&nbsp;Juliana Guzmán ,&nbsp;Daniele de Melo Mendes ,&nbsp;Virgínio Henrique de Miranda Lopes Neumann","doi":"10.1016/j.revmic.2022.100605","DOIUrl":"10.1016/j.revmic.2022.100605","url":null,"abstract":"<div><p><span>The Araripe, Jatobá and Tucano Norte basins, northeast Brazil, have an extensive fossil record. Among the groups found, are the ostracods<span>, which have great relevance for this region due to their significant occurrence and wide diversity during the Upper Jurassic–Lower Cretaceous. These basins contain the rift process record of the Gondwana breakup for the posterior installation of the South Atlantic Ocean, data reinforced by the correlated ostracod non-marine fauna with some African basins. This paper presents a detailed taxonomic and biostratigraphic study of the ostracod species recovered from outcrops from these three basins. A total of 29 species were identified, distributed in eight genera: </span></span><em>Theriosynoecum pricei, Theriosynoecum</em> sp. cf. <em>T.</em> sp. 6, <em>Cypridea acicularis, Cypridea ambigua, Cypridea indiennensis densipunctata, Cypridea sellata, Cypridea semilunaris, Cypridea vianai, Cypridea paraibensis, Cypridea</em> (<em>Morinina</em>?) <em>bibullata bibullata, Cypridea</em> (<em>Morinina</em>?) <em>bibullata tribullata, Cypridea</em> sp. cf. <em>C.</em> (<em>Morinina</em>?) <em>langei, Cypridea</em> sp. cf. <em>Cypridea miritiensis, Cypridea</em> sp. 1, <em>Paracypridea brasiliensis, Paracypridea quadrirugosa quadrirugosa, Paracypridea</em> ex. gr. <em>elegans, Salvadoriella redunca posterior, Reconcavona</em>? <em>jatobaensis, Reconcavona striata, Reconcavona striatula, Reconcavona swaini, Reconcavona</em> aff. <em>R.</em>? <em>polita, Reconcavona</em> sp. cf. <em>R. triebeli, Reconcavona</em> sp.1, <em>Reconcavona</em> sp.2, <em>Rhinocypris</em> sp.1, <em>Darwinula</em>? sp. cf. <em>D. oblonga, Alicenula</em> sp. cf. <em>Alicenula leguminella</em><span>. From the identification of these species, it was possible to infer a stratigraphic range from Tithonian<span> to Barremian, which corresponds to the local RT-001 to RT-007 biozones.</span></span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"74 ","pages":"Article 100605"},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123729067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Morphological evolution of menardiform globorotalids at Western Pacific Warm Pool ODP Hole 806C (Ontong-Java Plateau) Evolution morphologique du groupe de Globorotalia menardii au Site ODP 806C (Ontong-Java Plateau, Pacifique tropical occidental) 西太平洋暖池ODP孔806C (onong -爪哇高原)menorotalia Globorotalia menaridi au站点ODP 806C (onong -爪哇高原,太平洋热带西部)演化形态学
IF 0.9
REVUE DE MICROPALEONTOLOGIE Pub Date : 2022-04-01 DOI: 10.1016/j.revmic.2022.100608
Michael Knappertsbusch
{"title":"Morphological evolution of menardiform globorotalids at Western Pacific Warm Pool ODP Hole 806C (Ontong-Java Plateau) Evolution morphologique du groupe de Globorotalia menardii au Site ODP 806C (Ontong-Java Plateau, Pacifique tropical occidental)","authors":"Michael Knappertsbusch","doi":"10.1016/j.revmic.2022.100608","DOIUrl":"https://doi.org/10.1016/j.revmic.2022.100608","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The morphological evolution was investigated in the tropical Neogene planktonic foraminiferal lineage &lt;em&gt;Globorotalia menardii, G. limbata&lt;/em&gt; and &lt;em&gt;G. multicamerata&lt;/em&gt;&lt;span&gt; during the past 8 million years at ODP Hole 806C (Ontong-Java Plateau, western equatorial Pacific). This research is an extension of several similar studies since 2007 from the Caribbean Sea, the tropical Atlantic and the Eastern Equatorial Pacific. The goal is to find empirical and quantitative confirmation for morphological speciation – splitting or phyletic gradualism or accelerated evolution – in planktonic foraminifera with the above lineage as model objects. The present study from ODP Hole 806C serves as a test to discriminate between these evolutionary scenarios.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;In the western equatorial Pacific warm and stable environments prevailed back to Pliocene times, and potential influences of Northern Hemisphere Glaciation are thought to bear less severely on shell size evolution than in the Atlantic Ocean. A slow and gradual pattern of shell size increase is therefore expected in the western tropical Pacific, in contrast to the intermittent rapid menardiform shell size increase during periods of intensified formation of warm water eddies in the southern to tropical Atlantic.&lt;/p&gt;&lt;p&gt;For this study a total of 11,101 specimens from 37 stratigraphic levels extending over the past 8 million years were morphometrically investigated thanks to the &lt;em&gt;AMOR&lt;/em&gt; robot for imaging and microfossil orientation. Of those, 6080 specimens comprise the &lt;em&gt;G. menardii–limbata-multicamerata&lt;/em&gt; plexus. Special attention was given to trends of spiral height (δX) versus axial length (δY) in keel view, for which bivariate contour- and volume-density diagrams were constructed to visualize speciation and evolutionary trends.&lt;/p&gt;&lt;p&gt;The investigation at Hole 806C showed, that &lt;em&gt;G. menardii&lt;/em&gt; evolved in a more gradual manner than in the Atlantic. Contour plots of δX versus δY reveal modest bimodality between 3.18 Ma – 2.55 Ma with a dominant branch consisting of smaller &lt;em&gt;G. menardii&lt;/em&gt; (δX&lt;∼300 μm) persisting until the Late Quaternary, and a less dominant branch of larger &lt;em&gt;G. menardii&lt;/em&gt; (δX&gt;∼300 μm) until 2.63 Ma. There is evidence for cladogenesis – splitting with subsequent morphological divergence in the Late Pliocene &lt;em&gt;G. menardii-limbata-multicamerata&lt;/em&gt;&lt;span&gt; lineage, and which may be linked to changes in the thermocline. Due to the general scarcity of &lt;/span&gt;&lt;em&gt;G. multicamerata&lt;/em&gt; at Site 806, the divergence was less clearly expressed than originally expected. Up-section, bimodality vanished but &lt;em&gt;G. menardii&lt;/em&gt; populations shifted towards extra large shells between 2.19-1.95 Ma.&lt;/p&gt;&lt;p&gt;The morphological evolution of Pacific menardiform globorotalids contrasts the one observed in the Atlantic. This inter-oceanic asymmetry may indicate possible long-distance dispersal of &lt;em&gt;G. menardii&lt;/em&gt;, at least during intermittent phases&lt;em&gt;.&lt;/","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"74 ","pages":"Article 100608"},"PeriodicalIF":0.9,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137312540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Early Pliocene ostracods from the Nocella River Mouth sedimentary succession (NW Sicily, Italy) 意大利西西里岛西北部Nocella河口沉积序列中的早上新世介形类
IF 0.9
REVUE DE MICROPALEONTOLOGIE Pub Date : 2021-12-01 DOI: 10.1016/j.revmic.2021.100530
Francesco Sciuto , Agatino Reitano
{"title":"Early Pliocene ostracods from the Nocella River Mouth sedimentary succession (NW Sicily, Italy)","authors":"Francesco Sciuto ,&nbsp;Agatino Reitano","doi":"10.1016/j.revmic.2021.100530","DOIUrl":"10.1016/j.revmic.2021.100530","url":null,"abstract":"<div><p><span><span>In this article is analysed for the first time the ostracods<span> association from the Early Pliocene (MPL 3 Zone) sandy clayey silt outcropping, along the shore, to the left of the Nocella river mouth (Castellammare Gulf, NW Sicily). The ostracods association is abundant and well preserved and is referred to a not very deep </span></span>paleoenvironment<span> of the Continental Shelf. Some species, belonging to the genera </span></span><em>Cytherelloidea, Eucytherura, Pseudocytherura, Aurila, Pachycaudites, Tenedocythere, Capsacythere, Echinocythereis</em> have been identified, described and figured here for the first time.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"73 ","pages":"Article 100530"},"PeriodicalIF":0.9,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114772547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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