Rivista Italiana Di Paleontologia E Stratigrafia最新文献_第3页

THE DISTRIBUTION RANGE OF CALCAREOUS NANNOFOSSIL SPECIES RETICULOFENESTRA PSEUDOUMBILICUS IN THE MIOCENE: AN EXAMPLE OF ECOLOGICAL INFLUENCE ON EVOLUTIONARY DEVELOPMENT 中新世钙质纳米化石的分布范围:生态对进化发展的影响

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-02-09 DOI: 10.54103/2039-4942/17769

Amalia Notaro, I. Raffi, Daniele Reghellin

{"title":"THE DISTRIBUTION RANGE OF CALCAREOUS NANNOFOSSIL SPECIES RETICULOFENESTRA PSEUDOUMBILICUS IN THE MIOCENE: AN EXAMPLE OF ECOLOGICAL INFLUENCE ON EVOLUTIONARY DEVELOPMENT","authors":"Amalia Notaro, I. Raffi, Daniele Reghellin","doi":"10.54103/2039-4942/17769","DOIUrl":"https://doi.org/10.54103/2039-4942/17769","url":null,"abstract":"Reticulofenestra pseudoumbilicus is a Neogene calcareous nannofossil species whose highest stratigraphic occurrence (Top) is a reliable biohorizon in the Pliocene, calibrated at 3.82 Ma. The species is present in the stratigraphic record from at least the Middle Miocene, within an interval around the biohorizon Top Sphenolithus heteromorphus, calibrated at 13.53 Ma, but its lower distribution range is not precisely delineated. The study of nannofossil assemblages in sediment cores from Integrated Ocean Drilling Program IODP Site U1338 (eastern equatorial Pacific) indicates a lower stratigraphic position for the evolutionary emergence (Base) of R. pseudoumbilicus, detected in the Early Miocene with an estimated age of 16.46 Ma. This age results from a new astronomically tuned chronology, which dates the deepest sediments at Site U1338 to 16.67 Ma. Base R. pseudoumbilicus is followed above by a temporary disappearance of the taxon until a re-entrance after ~3 Myr. This lengthened stratigraphic range has been confirmed by data from other locations at low and mid-latitudes in the Atlantic. The distribution range of R. pseudoumbilicus, lasting ~13 Myr during the Neogene, is thus characterized by a variable pattern of repeated occurrences and disappearances. Comparison to benthic foraminifera δ18O and δ13C records suggests a control by global climatic/environmental conditions on these events, particularly by temperature variations. The recurrent presence of R. pseudoumbilicus at stratigraphically different intervals could represent an example of iterative evolution, expressed as repeated speciation events that are in part influenced by complex external factors related to the dynamic climate and environmental evolution during the Miocene.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44235340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PALEOCLIMATE AND PALEOENVIRONMENT IN NORTH-WESTERN ITALY (SOUTHERN ALPS) DURING THE LAST GLACIAL STAGE: THE SMALL-MAMMAL RECORD FROM THE BUCO DEL FRATE CAVE (PREVALLE – BRESCIA) 末次冰川期意大利西北部（阿尔卑斯山南部）的古气候和古环境：来自布科-德尔弗拉特洞穴（PREVALLE-BRESCIA）的小型哺乳动物记录

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-25 DOI: 10.54103/2039-4942/18113

F. Bona, M. Baioni, E. Cilli

{"title":"PALEOCLIMATE AND PALEOENVIRONMENT IN NORTH-WESTERN ITALY (SOUTHERN ALPS) DURING THE LAST GLACIAL STAGE: THE SMALL-MAMMAL RECORD FROM THE BUCO DEL FRATE CAVE (PREVALLE – BRESCIA)","authors":"F. Bona, M. Baioni, E. Cilli","doi":"10.54103/2039-4942/18113","DOIUrl":"https://doi.org/10.54103/2039-4942/18113","url":null,"abstract":"The palaeoclimatic and palaeoenvironmental data obtained by the study of the Buco del Frate cave small-mammals indicate that, around 40,000 years ago (MIS3), the eastern part of the province of Brescia, immediately to the west of Lake Garda, was characterised by the presence of open taiga environment and watercourses crossing the plain facing the cave.\u0000Specifically, the palaeoclimatic conditions of this part of north-western Italy around 40,000 years ago – compared to climate data for the years 1960-90 measured at Ghedi, 20 km southwest of the Buco del Frate cave – involved average temperatures some 4° C cooler and rainfall some 30% lower.\u0000Based on the collected data we show that the western part of the Po Valley, west of Lake Garda, was characterized by a steppe-like environment, not too different from the almost contemporaneous site of Settepolesini di Bondeno (Ferrara), defined as \"mammoth steppe\".\u0000We also note that the western Po Valley, if compared with deposits from high- and medium-mountain contexts in the same area, was characterized by a more steppe-like environment. Indeed, the mountain settings, in perhaps more sheltered areas, indicate the presence of environments with more trees (or, at least, bushes).","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47770397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SPATHIAN (LOWER TRIASSIC) CONODONTS FROM THE TIROLITES CASSIANUS BEDS IN PALEOTETHYS-ISSUED NORTH DOBROGEA OROGEN (ROMANIA) 罗马尼亚古特提斯-北多布罗格造山带古特提斯-北多布罗格造山带铁罗岩cassianus地层中的Spathian(下三叠统)牙形刺

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-24 DOI: 10.54103/2039-4942/17656

T. Kolar-Jurkovšek, YAN-LONG Chen, E. Grădinaru, B. Jurkovšek

引用次数: 0

FIRST THEROPOD RECORD FROM THE MARINE BATHONIAN OF JAISALMER BASIN, TETHYAN COAST OF GONDWANAN INDIA 来自印度冈瓦南特提斯海岸jaisalmer盆地海相深海的第一个兽脚亚目记录

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-23 DOI: 10.54103/2039-4942/18306

Archana Sharma, Christophe Hendrickx, Sanjay Singh

{"title":"FIRST THEROPOD RECORD FROM THE MARINE BATHONIAN OF JAISALMER BASIN, TETHYAN COAST OF GONDWANAN INDIA","authors":"Archana Sharma, Christophe Hendrickx, Sanjay Singh","doi":"10.54103/2039-4942/18306","DOIUrl":"https://doi.org/10.54103/2039-4942/18306","url":null,"abstract":"Middle Jurassic theropods have a scanty record worldwide, especially from Gondwana. In India, where Jurassic theropods are particularly rare and only represented by a few isolated teeth and some badly preserved bones, there is currently no record of theropods from the Middle Jurassic of western India. Here we report the first theropod dental material from Middle Jurassic marine carbonate rocks of the Jaisalmer Basin, north-western India. The specimen consists of an incomplete shed tooth crown recovered from bioclastic intraformational conglomerate bed of the Bathonian Fort Member of the Jaisalmer Formation. A cladistic analysis performed on a dentition-based data matrix revealed that the isolated crown likely pertained to a non-coelurosaur averostran possibly from the mesial dentition of a ceratosaurid, a non-spinosaurid megalosauroid, or an allosauroid. This shed tooth provides evidence that at least one taxon of medium to large-bodied theropod lived on the Tethyan coast of NW India during the Middle Jurassic. This contribution marks the Jaisalmer Basin as a new promising area in India for dinosaurian remains from the Jurassic Gondwana.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46723116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

LOPINGIAN (LATE PERMIAN) PALYNOMORPHS FROM THE CADEBY FORMATION, CADEBY QUARRY, YORKSHIRE, UK 英国约克郡卡德比采石场卡德比组Lopingian(晚二叠世)岩形岩

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-19 DOI: 10.54103/2039-4942/17850

M. Stephenson, D. McLean

{"title":"LOPINGIAN (LATE PERMIAN) PALYNOMORPHS FROM THE CADEBY FORMATION, CADEBY QUARRY, YORKSHIRE, UK","authors":"M. Stephenson, D. McLean","doi":"10.54103/2039-4942/17850","DOIUrl":"https://doi.org/10.54103/2039-4942/17850","url":null,"abstract":"Seventeen samples from the Cadeby Formation (Lopingian, Permian, EZ1) of Cadeby Quarry near Doncaster, South Yorkshire, UK, yielded organic residues including phytoclasts, cuticle, unstructured tissue and generally well-preserved palynomorphs. The palynomorph assemblages are dominated by taeniate and non-taeniate bisaccate pollen including Klausipollenites schaubergeri, Limitisporites rectus, Lueckisporites virkkiae and Taeniaesporites noviaulensis. The assemblages are generally similar to those from the English Midlands described from Kimberley Railway Cutting and the Haughton Hall Borehole, Nottinghamshire and those from the Marl Slate Formation (lower EZ1) of the Durham Sub-basin at Claxheugh Rock and Crime Rigg Quarry and to the mid EZ1 of the Salterford Farm Borehole and Woolsthorpe Bridge Borehole. The excellent preservation of the assemblages allows the recognition that Dicappipollenites Tiwari & Vijaya 1995 is a junior synonym of Lueckisporites Potonié & Klaus emend. Clarke 1965. \u0000The presence of rare microphytoplankton and microforaminiferal test linings indicate a neashore marine environment. The clastic (and organic) content of the Cadeby Formation, part of a dominantly carbonate succession, may represent erosion and transport of material from the hinterland reflecting a wetter climatic period, though the alternation of clastic and carbonate sedimentation in the section at Cadeby suggests some wet/dry palaeoclimatic cyclicity.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45829320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RECONSTRUCTING KUNGURIAN (CISURALIAN, PERMIAN) TERRESTRIAL ENVIRONMENTS WITHIN A MEGACALDERA IN THE SOUTHERN ALPS (N-ITALY) USING LITHOFACIES ANALYSIS, PALYNOLOGY AND STABLE CARBON ISOTOPES 利用岩相分析、孢粉学和稳定碳同位素重建了南阿尔卑斯(n -意大利)一个巨型火山口内的昆古里亚(顺苏拉、二叠纪)陆地环境

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-01-12 DOI: 10.54103/2039-4942/17938

F. Vallé, H. Nowak, E. Kustatscher, Sally Erkens, G. Roghi, C. Morelli, K. Krainer, N. Preto, C. Hartkopf-Fröder

{"title":"RECONSTRUCTING KUNGURIAN (CISURALIAN, PERMIAN) TERRESTRIAL ENVIRONMENTS WITHIN A MEGACALDERA IN THE SOUTHERN ALPS (N-ITALY) USING LITHOFACIES ANALYSIS, PALYNOLOGY AND STABLE CARBON ISOTOPES","authors":"F. Vallé, H. Nowak, E. Kustatscher, Sally Erkens, G. Roghi, C. Morelli, K. Krainer, N. Preto, C. Hartkopf-Fröder","doi":"10.54103/2039-4942/17938","DOIUrl":"https://doi.org/10.54103/2039-4942/17938","url":null,"abstract":"During the Permian, climate experienced a change from icehouse to greenhouse conditions. Few multidisciplinary studies have investigated Kungurian (late Cisuralian) tropical terrestrial ecosystem and climate changes. Here, we apply an interdisciplinary approach to two alluvial-lacustrine successions of the Athesian Volcanic Group (Southern Alps, northern Italy) deposited in a Kungurian megacaldera during periods of volcanic quiescence. Sedimentological analysis combined with palynofacies studies allowed the reconstruction of the depositional environments. The study of sporomorph assemblages and stable organic carbon isotopes provided information on plant communities and the climate context. Two different depositional environments were present in the megacaldera: one proximal and one more distal with respect to the source, distinguished by a slightly different composition of the sediments, palynofacies and organic carbon isotopes. The plant community in the area was dominated by xeromorphic-hygromorphic taxa. The δ13Corgvalues are comparable to those of other Cisuralian continental organic matter and plants. The stable carbon isotope values show a small variability, which correlates weakly, but significantly, with the abundance of xeromorphic elements. All observations support deposition during semiarid to arid climate conditions, typical of the mid-late Cisuralian in the area.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43122959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

THE QUIBAS SITE (MURCIA, SPAIN): NEW HERBIVORES FROM THE EARLY-MIDDLE PLEISTOCENE TRANSITION quibas遗址(西班牙穆尔西亚):早-中更新世过渡时期的新食草动物

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2022-11-15 DOI: 10.54103/2039-4942/16707

A. Rosas, E. Galli, D. Fidalgo, A. García-Tabernero, R. Huguet, Daniel García‐Martínez, P. Piñero, J. Agustí, Alba RICO-BARRIO, J. Vallverdú

{"title":"THE QUIBAS SITE (MURCIA, SPAIN): NEW HERBIVORES FROM THE EARLY-MIDDLE PLEISTOCENE TRANSITION","authors":"A. Rosas, E. Galli, D. Fidalgo, A. García-Tabernero, R. Huguet, Daniel García‐Martínez, P. Piñero, J. Agustí, Alba RICO-BARRIO, J. Vallverdú","doi":"10.54103/2039-4942/16707","DOIUrl":"https://doi.org/10.54103/2039-4942/16707","url":null,"abstract":"The Lower Pleistocene site of Quibas, in Sierra de Quibas (Murcia, Spain) was discovered in 1994 and has since then provided abundant material of typical Epivillafranchian taxa. This biochron belongs to the Early-Middle Pleistocene transition (1.2 – 0.78 Ma), characterised by a change in orbital cyclicity from a 41 kyr cycle to 100 kyr that intensified the climate and culminated in the most important faunal turnover of the Pleistocene regarding large mammals. The Group of Palaeoanthropology of the National Museum of Natural Sciences (CSIC, Spain) and the Institut Català de Paleoecologia Humana i Evolució Social (IPHES-CERCA, Spain) carried out four field seasons from 2015 to 2018. Here we present the large herbivorous mammals recovered from the field, including the first citation of two taxa new to the locality: Stephanorhinus cf. etruscus and Bison cf. voigtstedtensis. We also provide the first description of previously mentioned taxa: Dama cf. vallonnetensis and Sus sp. Together with the remaining herbivores, the faunal community shows a strong European affinity with some regionalism. Compared with other Iberian localities, the site of Quibas stands out for the lack of hominin fossils or any evidence supporting their presence in the area, a peculiar scenario given that the Early-Middle Pleistocene transition broadly speaking sees the arrival of humans into Europe.\u0000 ","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48609113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LOWER PALEOCENE DEEP-WATER AGGLUTINATED FORAMINIFERA FROM THE CONTESSA HIGHWAY SECTION (UMBRIA-MARCHE BASIN, ITALY): TAXONOMY, STRATIGRAPHIC DISTRIBUTION AND ASSEMBLAGE TURNOVER ACROSS THE CRETACEOUS/PALEOGENE BOUNDARY 意大利UMBRIA-MARCHE盆地孔特萨公路段古新世深水凝集有孔虫：白垩纪/古近纪边界的分类学、地层分布和组合翻转

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2022-11-11 DOI: 10.54103/2039-4942/17115

S. Hikmahtiar, M. Kaminski, Claudia G. Cetean

{"title":"LOWER PALEOCENE DEEP-WATER AGGLUTINATED FORAMINIFERA FROM THE CONTESSA HIGHWAY SECTION (UMBRIA-MARCHE BASIN, ITALY): TAXONOMY, STRATIGRAPHIC DISTRIBUTION AND ASSEMBLAGE TURNOVER ACROSS THE CRETACEOUS/PALEOGENE BOUNDARY","authors":"S. Hikmahtiar, M. Kaminski, Claudia G. Cetean","doi":"10.54103/2039-4942/17115","DOIUrl":"https://doi.org/10.54103/2039-4942/17115","url":null,"abstract":"Deep-water agglutinated foraminifera (DWAF) are investigated from the lower Paleocene of the Contessa Highway Paleocene (CHP) section in the Umbria-Marche Basin in Italy. In the lowermost part of the Paleocene corresponding to the P0–Pα interval and lowermost P1 planktonic foraminifera zones, a total of 46 species of DWAF are identified. A comparison with the uppermost Maastrichtian DWAF assemblages documented by Cetean (2009) results in a combined total of 94 DWAF species over the Cretaceous/Paleogene boundary interval at Contessa Highway. Of these, 49 species are listed as extinction taxa, nine are survivor taxa, 19 are Lazarus taxa, and 17 taxa display first occurrences in the Paleocene. The record of DWAF in the Contessa Highway Paleocene section displays a moderate decrease in diversity across the K/Pg boundary, followed by a gradual recovery in the first meter of the Paleocene. The lower Paleocene record is characterized by blooms of opportunistic species belonging to the genera Reophax, Subreophax, Repmanina, and Spiroplectinella. The K/Pg boundary interval records a major change in the proportions of DWAF morphogroups, from a suspension-feeding community in the Maastrichtian to one dominated by epifaunal detritivores in the lower Paleocene, reflecting a fundamental change in marine primary productivity following the bolide impact. ","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46583808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MIDDLE TRIASSIC (ANISIAN) CEPHALOPODS FROM THE MECSEK MOUNTAINS, HUNGARY 匈牙利梅塞克山中三叠世（ANISIAN）头足类动物

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2022-11-03 DOI: 10.54103/2039-4942/17253

A. Vörös, G. Konrád, Krisztina Sebe

引用次数: 1

UPPER CISURALIAN-LOWER GUADALUPIAN BRACHIOPODS FROM THE QARARI UNIT, BATAIN PLAIN, NORTHEAST OMAN: SYSTEMATICS, PALAEOECOLOGY AND CORRELATION 阿曼东北部巴坦平原石英组上顺滑系-下瓜达鲁普系腕足动物:系统学、古生态学及对比

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2022-10-19 DOI: 10.54103/2039-4942/17732

Marco Viaretti, A. Heward, A. Gementi, L. Angiolini

{"title":"UPPER CISURALIAN-LOWER GUADALUPIAN BRACHIOPODS FROM THE QARARI UNIT, BATAIN PLAIN, NORTHEAST OMAN: SYSTEMATICS, PALAEOECOLOGY AND CORRELATION","authors":"Marco Viaretti, A. Heward, A. Gementi, L. Angiolini","doi":"10.54103/2039-4942/17732","DOIUrl":"https://doi.org/10.54103/2039-4942/17732","url":null,"abstract":"Permian brachiopods from Oman are well-known as valuable tools for correlation and palaeobiogeographical and palaeoclimatic reconstructions. Here, we describe a new brachiopod fauna from the Qarari Unit of the allochthonous Batain Group in northeast Oman. Brachiopods were collected from four localities: Wadi Khawr al Jaramah (WKJ), Jebel Qarari (JQ1), Jebel X (JX3) and Shiya (SH11). The age of the fossiliferous localities is wellconstrained to the late Kungurian-early Roadian by conodonts and fusulines, in agreement with the age suggested by the brachiopod ranges.The brachiopod fauna consists of 339 specimens belonging to 68 species of 8 orders, among which five species are here identified as new. Based on the taphonomic attributes and the analysis of the brachiopod life-styles, the assemblages from the Qarari Unit are interpreted as life assemblages thriving on varied substrates, with limited post-mortem exposure on the sea floor and rapid burial at depths around the storm wave base.Based on the generally high biodiversity indices (Shannon-Wiener and Margalef indices), the Qarari brachiopod fauna can be considered a biodiversity hotspot, only comparable, in term of biodiversity, to the coeval faunas from West Texas and South China. However, palaeobiogeographical affinities of the Qarari brachiopods with these faunas are scanty, as well as the affinities with coeval faunas from the northern Gondwana margin and the Cimmerian and Cathaysian blocks, except for some similarities with the upper Kungurian brachiopods of Myanmar. This may be explained by the fact that the Qarari succession was deposited in the Madagascan arm of Neo-Tethys, and thus rather isolated from the main Gondwanan margin.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41643036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2