Acta Geologica Polonica最新文献

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Oligocene crabs (Decapoda: Brachyura) from the Asmari Formation in Yasuj area (SW Iran) 伊朗西南部Yasuj地区Asmari组渐新世蟹类(十足目:短肢目)
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2023-06-27 DOI: 10.24425/agp.2023.145615
A. Bahrami, À. Ossó, M. Yazdi, Heshmatollah Ansari
{"title":"Oligocene crabs (Decapoda: Brachyura) from the Asmari Formation in Yasuj area (SW Iran)","authors":"A. Bahrami, À. Ossó, M. Yazdi, Heshmatollah Ansari","doi":"10.24425/agp.2023.145615","DOIUrl":"https://doi.org/10.24425/agp.2023.145615","url":null,"abstract":": Bahrami, A., Ossó, À., Yazdi, M. and Ansar, H. 2023. Oligocene crabs (Decapoda: Brachyura) from the Asmari Formation in Yasuj area (SW Iran). Acta Geologica Polonica , 73 (2), 189–200. Warszawa. New findings of crustacean decapod brachyurans from the Rupelian period (lower Oligocene) in Iran are presented in this study. In particular, Lophoranina sp. and Palaeocarpilius cf. P. rugifer Stoliczka, 1871, from the Rupelian strata were found in two previously unexplored localities, Abshar and Vezg near Yasuj in the south-western region of Iran. The discovery contributes to fill the gap in the record of brachyuran decapod crustaceans in Iran during the Eocene and Miocene periods. The presence of both genera in the Oligocene of Iran suggests a certain degree of faunal similarity among brachyurans on both sides of the Tethys Realm.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44396255","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}
引用次数: 0
Interaction between tectonics, plutonism and mineralization of the Duna Pb-Ba ore deposit regarding fluid inclusion study (Central Alborz, Iran) 关于流体包裹体研究的Duna Pb-Ba矿床的构造、深成作用和成矿作用之间的相互作用(伊朗阿尔博兹中部)
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2023-06-27 DOI: 10.24425/agp.2022.143597
Alireza Sadeghi, Saeid Hakimi Asiabar, N. Nezafati, Alireza Ganji, Soumyajit Mukherjee
{"title":"Interaction between tectonics, plutonism and mineralization of the Duna Pb-Ba ore deposit regarding fluid inclusion study (Central Alborz, Iran)","authors":"Alireza Sadeghi, Saeid Hakimi Asiabar, N. Nezafati, Alireza Ganji, Soumyajit Mukherjee","doi":"10.24425/agp.2022.143597","DOIUrl":"https://doi.org/10.24425/agp.2022.143597","url":null,"abstract":": Sadeghi, A., Asiabar, S.H., Nezafati, N., Ganji, A. and Mukherjee, S. 2023. Interaction between tectonics, plu-tonism and mineralization of the Duna Pb-Ba ore deposit regarding fluid inclusion study (Central Alborz, Iran). Acta Geologica Polonica , 73 (2), 201–222. Warszawa. This article discusses the impacts of overprinting of tectonic and plutonic events on the mineralization of the Duna Pb-Ba ore deposit, according to geologic settings and fluid inclusion studies. The Duna carbonate-hosted deposit contains a significant amount of Ag (18.9–264.3 ppm ), Cu (77–41600 ppm), Sb (32.7–11000 ppm), Sr (63.5– 15100 ppm), and Fluid inclusions with 7.34–23.65 wt.% NaCl equivalent. The homogenization temperature of about 110–285°C, as well as the paragenesis of the minerals shows a difference compared with other Pb-Zn deposits such as the Irish-type and MVT. The ore mineralization in the Duna mine occurred as stratabound, open space-filling, and along the brecciated fault zones. The concordant (stratabound) type of mineralization, with salinity and homogenization temperature of 18.54 to 23.65 wt.% NaCl equivalent, and 113°C to 165°C respectively, is usually typical of MVT-ore deposits, which in this area evolved during the Early Cimmerian orogeny and was later interrupted by mineralization along younger brecciated fault zones with salinity and homogenization temperature of 7.34 to 23.65 wt.% NaCl equivalent, and 113°C to 285°C respectively. This discordant mineralization, which occurred along the faults, formed by the end of the Late Cretaceous and during the Cenozoic as a result of the intrusion of a plutonic mass, and is comparable to the Irish-type ore deposits.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":"254 2","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41288114","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}
引用次数: 0
A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France 英格兰Cenomanian白垩系的标志带folgen地层学及其延伸至德国和法国北部
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2023-06-27 DOI: 10.24425/agp.2023.145616
Christopher Vincent Jeans
{"title":"A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France","authors":"Christopher Vincent Jeans","doi":"10.24425/agp.2023.145616","DOIUrl":"https://doi.org/10.24425/agp.2023.145616","url":null,"abstract":": Jeans, C.V. 2023. A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France. Acta Geologica Polonica , 73 (2), 135–180. Warszawa. A novel stratigraphical scheme within the Folge Concept is described for the Cenomanian Chalk of England that is particularly suitable for investigating the regional changes in the lithofacies, diagenesis, geochemistry, and mineralogy of the sediments of the Chalk Sea leading up to the Cenomanian–Turonian Oceanic Anoxic Event. It is based on “isochronous” marker bands defined largely by calcitic macrofossil assemblages, and it avoids problems caused by the poor or non-preservation of ammonite assemblages and lateral changes in chalk lithofacies. Eight folgen are based on one, two, or more marker bands. Their sequences, lithologies and calcitic macrofossil assemblages are described from 33 exposures in the Northern Chalk Province of England. The folgen are named, in ascending order, the Belchford, Stenigot, Dalby, Bigby, Candlesby, Nettleton, Louth and Flixton, after villages in Lincolnshire and Yorkshire, England. The folgen are traced throughout the Transitional and Southern Chalk provinces of England. They are present in the Cenomanian chalk of northern Germany and northwest France. Regionally, an individual folge may display considerable vertical and lateral variation in general lithology and lithofacies whilst still maintaining their defining marker bands. The possibility of further refinement to the scheme is discussed.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47308025","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}
引用次数: 0
145611 one hundred and forty-five thousand six hundred and eleven
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2023-04-14 DOI: 10.24425/agp.2023.145611
{"title":"145611","authors":"","doi":"10.24425/agp.2023.145611","DOIUrl":"https://doi.org/10.24425/agp.2023.145611","url":null,"abstract":"","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944746","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}
引用次数: 0
Causes of groundwater level and chemistry changes in an urban area; a case study of Warsaw, Poland 市区地下水位和化学变化的原因;以波兰华沙为例
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2023-04-03 DOI: 10.24425/agp.2022.142645
{"title":"Causes of groundwater level and chemistry changes in an urban area; a case study of Warsaw, Poland","authors":"","doi":"10.24425/agp.2022.142645","DOIUrl":"https://doi.org/10.24425/agp.2022.142645","url":null,"abstract":": Krogulec, E., Gruszczyński, T., Kowalczyk, S., Małecki, J.J., Mieszkowski, R., Porowska, D., Sawicka, K., Trzeciak, J., Wojdalska, A., Zabłocki, S. and Zaszewski, D. 2022. Causes of groundwater level and chemistry changes in an urban area; a case study of Warsaw, Poland. Acta Geologica Polonica , 72 (4), 495–517. Warszawa. The presented studies focus on changes in groundwater levels and chemistry, and the identification of important factors influencing these changes on short-and long-term scales in urban areas. The results may be useful for rational and sustainable groundwater planning and management in cities. The studies concerned three aquifers: (1) the shallow Quaternary aquifer, (2) the deep Quaternary aquifer, and (3) the Oligocene aquifer in the capital city of Warsaw (Poland). The spatial variability of groundwater recharge was determined and its changes in time were characterized. The characteristics of groundwater levels were based on long-term monitoring series. The results indicate that urban development has caused overall reduction in infiltration recharge (from 54 to 51 mm/ year), which is particularly clear in the city suburbs and in its centre, where land development has significantly densified during the last 30 years. Studies of groundwater levels indicate variable long-term trends. However, for the shallowest aquifer, the trends indicate a gradual decrease of the groundwater levels. In the case of the much deeper Oligocene aquifer, groundwater table rise is observed since the 1970s (averagely c. 20 m), which is related with excessive pumping. Based on the studied results, the groundwater chemistry in the subsurface aquifer indicates strong anthropogenic influence, which is reflected in multi-ionic hydrogeochemical types and the occurrence of chemical tracers typical of human activity. The Oligocene aquifer is characterized by a chemical composition indicating the influence of geogenic factors.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45941998","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}
引用次数: 0
Early Pliocene calcareous and siliceous microfossils of the Sawai Bay Formation, Car Nicobar Island, northern Indian Ocean 印度洋北部卡尔尼科巴岛Sawai湾组上新世早期钙质和硅质微体化石
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2020-11-27 DOI: 10.24425/agp.2020.134554
A. Chakraborty, Amit K. Ghosh, K. Mccartney, S. Saxena, R. Dee, L. Roy
{"title":"Early Pliocene calcareous and siliceous microfossils of the Sawai Bay Formation, Car Nicobar Island, northern Indian Ocean","authors":"A. Chakraborty, Amit K. Ghosh, K. Mccartney, S. Saxena, R. Dee, L. Roy","doi":"10.24425/agp.2020.134554","DOIUrl":"https://doi.org/10.24425/agp.2020.134554","url":null,"abstract":"The present contribution provides a study of calcareous nannofossils and siliceous microfossils from the Sawai Bay Formation on Car Nicobar Island, northern Indian Ocean. Two stratigraphically short sediment intervals near Sawai Bay have been examined. Qualitative and quantitative microfossil analyses show the Sawai Bay ‘A’ Section to be devoid of siliceous microfossils, while 24 well-preserved calcareous nannofossil taxa are identified. The Sawai Bay ‘B’ Section yields 18 calcareous nannofossil, 33 radiolarian and 25 diatom taxa. The calcareous nannofossil index taxa ( Ceratolithus armatus Muller, 1974a and C. cristatus  Kamptner, 1950) indicate both sections to be from zones NN12 (CN10b) and NN13 (CN10c) of early Pliocene (Zanclean) age. The radiolarian taxa, i.e., Didymocyrtis avita Riedel, 1953, Euchitonia spp., Siphocampe lineata (Ehrenberg) Nigrini, 1977, Stichocorys peregrina Riedel, 1953, Semantis spp. and Stylochlamydium sp. are common in the Sawai Bay ‘B’ Section, which is assigned to Zone RN9. Most of the diatom taxa are represented by representatives of the genera Actinocyclus Ehrenberg, 1837, Azpeitia Peragallo in Tempere and Peragallo, 1912, Coscinodiscus Ehrenberg, 1839a, Grammatophora Ehrenberg, 1841 and Triceratium Ehrenberg, 1839b, with the benthic diatom species Triceratium favus Ehrenberg, 1839b being predominant (~35% of the total diatom count). Siliceous microfossils are also represented by silicoflagellates dominated by Dictyocha spp. and sponge spicules dominated by astrophorids.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41865498","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}
引用次数: 2
Professor Piotr Roniewicz (1936–2019). In memoriam Piotr Roniewicz教授(1936–2019)。纪念
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2020-11-19 DOI: 10.24425/agp.2020.132261
A. Wysocka, E. Głowniak, M. Szulczewski, S. Rudowski, J. Giżejewski, P. Karnkowski, J. Pinińska, G. Pieńkowski, Stanisław Skompski, E. Słaby, A. Kalinowska, G. Sawicki
{"title":"Professor Piotr Roniewicz (1936–2019). In memoriam","authors":"A. Wysocka, E. Głowniak, M. Szulczewski, S. Rudowski, J. Giżejewski, P. Karnkowski, J. Pinińska, G. Pieńkowski, Stanisław Skompski, E. Słaby, A. Kalinowska, G. Sawicki","doi":"10.24425/agp.2020.132261","DOIUrl":"https://doi.org/10.24425/agp.2020.132261","url":null,"abstract":"Piotr Roniewicz was born in 1936 in Warsaw, however his family roots were in Stanislawow (nowadays Ivano-Frankivsk, Ukraine). He completed his university studies at the Faculty of Geology of the University of Warsaw in 1959, gaining a Master’s Degree. He began his geological career at this Faculty already as a 4th year student. In 1981–1984 he was the Vice-Dean and later in 1984–1990 – the Dean of the Faculty. Professor Roniewicz worked there until his retirement in 2006.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48320831","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}
引用次数: 0
Gastropods [Trochoidea: Trochidae Rafinesque, 1815 and Calliostomatidae Thiele, 1924 (1847)] from the middle Miocene of Ukraine, Central Paratethys 乌克兰中新世中期的腹足纲动物[Trochoidea:Trochidae Rafinesque,1815和Callitomatidae Thiele,1924(1847)],中副特提斯
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2020-11-19 DOI: 10.24425/agp.2019.126462
Ewa Nosowska
{"title":"Gastropods [Trochoidea: Trochidae Rafinesque, 1815 and Calliostomatidae Thiele, 1924 (1847)] from the middle Miocene of Ukraine, Central Paratethys","authors":"Ewa Nosowska","doi":"10.24425/agp.2019.126462","DOIUrl":"https://doi.org/10.24425/agp.2019.126462","url":null,"abstract":"Over three thousand specimens representing the superfamily Trochoidea Rafinesque, 1815 [Trochidae Rafinesque, 1815 and Calliostomatidae Thiele, 1924 (1847)] from the upper Upper Badenian = Kosovian = lower Serravallian (middle Miocene) marine deposits of Ukraine, housed in the collections of the Polish Academy of Sciences Museum of the Earth in Warsaw (MZ), are studied herein. The abundant material has allowed for investigations of the intraspecific variation and revision of earlier determinations. As a result, 21 species belonging to 5 genera have been identified, described and illustrated, of which one is new [Clanculus (Clanculopsis) krachi sp. nov.] and one is left in open nomenclature. Granulifera O. Anistratenko, 2000 is considered a junior subjective synonym of Clanculopsis Monterosato, 1879; Granulifera pulla O. Anistratenko, 2000 is considered a junior subjective synonym of Monodonta tuberculata Eichwald, 1830; Gibbula sytovae Amitrov, 1961 is considered a junior subjective synonym of Trochus miocaenicus Mayer, 1853; Gibbula volhynica Friedberg, 1928 is considered a junior subjective synonym of Trochus novemcinctus von Buch, 1830; and Trochus buchii du Bois de Montpereux, 1831 is suppressed in favour of the senior subjective synonym Trochus puschii Andrzejowski, 1830. The geographic distribution and stratigraphic ranges of the taxa are given. Six species are known only from the Polish-Ukrainian part of the Fore-Carpathian Basin. The protoconch features are systematically studied in the Trochidae and Calliostomatidae from this area for the first time.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43370016","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}
引用次数: 1
The erratic rocks of the Upper Cretaceous Chalk of England: how did they get there, ice transport or other means? 英格兰上白垩纪白垩的不稳定岩石:它们是如何到达那里的,冰运输还是其他手段?
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2020-11-19 DOI: 10.24425/agp.2020.134555
C. Jeans, I. M. Platten
{"title":"The erratic rocks of the Upper Cretaceous Chalk of England: how did they get there, ice transport or other means?","authors":"C. Jeans, I. M. Platten","doi":"10.24425/agp.2020.134555","DOIUrl":"https://doi.org/10.24425/agp.2020.134555","url":null,"abstract":"Rare erratic clasts – extraneous rock types – occur in the Upper Cretaceous Chalk, including a local basal facies, the Cambridge Greensand. The underlying Upper Albian Gault Clay and the Hunstanton Red Chalk Formations have also yielded erratics. The discovery of these erratics, their description and the development of hypotheses to explain their origins and significance are reviewed. They became the subject of scientific interest with the interpretation of a particularly large example “The Purley Boulder” by Godwin-Austen (1858) as having been transported to its depositional site in the Chalk Sea by drifting coastal ice. Thin section petrography (1930–1951) extended knowledge of their diverse provenance. At the same time the Chalk Sea had become interpreted as warm, so drifting ice was considered out of context, and the preferred agents of transport were entanglement in the roots of drifting trees, as holdfasts of floating marine algae, or as stomach stones of marine reptiles or large fish. Reconsideration of their occurrence, variable nature and sedimentary setting suggests that there are three zones in the English Chalk where erratics may be less rare (1) near the base of the Cenomanian in the Cambridge area, (2) the Upper Cenomanian–Middle Turonian in Surrey, and (3) the Upper Coniacian and Lower Santonian of Kent. The assemblage from each level and their sedimentary setting is subtly different. Present evidence suggests that the erratics found in the Upper Albian–Lower Cenomanian and the Upper Cenomanian–Middle Turonian zones represent shallow water and shoreline rocks that were transported into the Chalk Sea by coastal ice (fast-ice) that enclosed coastal marine sediments as it froze. The Upper Coniacian and Lower Santonian erratics from  Rochester and Gravesend in Kent are gastroliths.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45767099","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}
引用次数: 1
Acorn barnacles (Crustacea, Thoracica, Balanomorpha) from the Eocene and Oligocene of the Isle of Wight and Hampshire (United Kingdom) and Manche, northern France 怀特岛、汉普郡(英国)和法国北部曼切始新世和渐新世的橡子藤壶(甲壳纲、胸科、Balanomorpha)
IF 1.1 4区 地球科学
Acta Geologica Polonica Pub Date : 2020-10-29 DOI: 10.24425/agp.2020.132263
A. Gale
{"title":"Acorn barnacles (Crustacea, Thoracica, Balanomorpha) from the Eocene and Oligocene of the Isle of Wight and Hampshire (United Kingdom) and Manche, northern France","authors":"A. Gale","doi":"10.24425/agp.2020.132263","DOIUrl":"https://doi.org/10.24425/agp.2020.132263","url":null,"abstract":"Balanomorph cirripedes from the Eocene–Oligocene of the Hampshire Basin (United Kingdom) and the Middle Eocene of the Cotentin Peninsula, Manche (France) are described. A new genus, Vectibalanus , is founded, with the type species Balanus unguiformis J. de C. Sowerby, 1846; assigned to this are also Balanus erisma J. de C. Sowerby, 1846 and Vectibalanus mortoni sp. nov. In addition, a new species of Lophobalanus Zullo, 1984, L. fresvillensis sp. nov., is described. This is the first record of that genus from outside the eastern USA and the oldest species known to date. Cladistic analysis of 24 morphological characters suggests that Vectibalanus unguiformis is sister taxon to a group comprising the most derived balanomorph taxa, and thus represents an important transition in the evolution of the group, with the initiation of development of a complex parietal wall structure. Vectibalanus unguiformis was evidently adapted to low salinity habitats (10–30 ppt), and is the oldest known brackish water barnacle. The other species ( V. erisma, V. mortoni sp. nov.) occupied more clearly marine environments (>30 ppt). Balanomorph barnacles appeared simultaneously in the Priabonian (Upper Eocene) of the Gulf and Atlantic seaboards of the USA and northwest Europe, which probably represents a northerly migration from Tethys.","PeriodicalId":7030,"journal":{"name":"Acta Geologica Polonica","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44763060","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}
引用次数: 0
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