REVUE DE MICROPALEONTOLOGIE最新文献

{"title":"A preliminary investigation of Eocene larger benthic foraminifera assemblages from Alpine and molasse-type deposits of the Hellenic peninsula (Greece)","authors":"Vasiliki-Grigoria Dimou ,&nbsp;Olga Koukousioura ,&nbsp;Margarita D. Dimiza ,&nbsp;Maria V. Triantaphyllou ,&nbsp;György Less ,&nbsp;Fotini Pomoni-Papaioannou ,&nbsp;Georgios Syrides","doi":"10.1016/j.revmic.2020.100468","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100468","url":null,"abstract":"<div><p>Larger Benthic Foraminifera (LBF) from five localities in Greece were studied in order to define the morphological features of various nummulitid forms and to describe the foraminiferal assemblages in different geotectonic environments. The selected sites belong to molasse-type formations in Kirki/Thrace Basin and Vasiliki Trikala/Mesohellenic Trough, and carbonate deposits in Alpine Pindos, Ionian and Tripolis geotectonic units.</p><p><span>Taxonomic studies combined with biometric data, when possible, enabled us to identify different morphotypes. In the molasse-type deposits of Thrace Basin (Kirki Thrace), </span><em>N. perforatus</em> was found along with <em>N. maximus</em> and <em>Assilina exponens</em> suggesting correlation with biozone SBZ 16/17, while in the Mesohellenic Trough deposits (Vasiliki Trikala) the association included <em>N. perforatus</em> group, <em>Operculina gomezi</em> group and <em>Silvestriella tetraedra</em><span><span>, indicating a Bartonian age, SBZ 17-18A. In outcrops found within Pindos unit (Perivoli Grevena) three different assemblages have been observed in the microbreccious olistholiths, suggesting three distinguished deposits forming quasi-continuous succession spanning from early to middle and up to late Eocene. The Ionian unit (Manoliasa Ioannina) presented a mixed redeposited fauna including late Eocene, early </span>Paleogene and planktonic foraminifera clasts. Finally, the Tripolis unit (Dervenakia and Tripolis) association was interpreted as Bartonian in age, defined by the presence of </span><em>Operculina gomezi</em> group and <em>N. perforatus</em> group.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"70 ","pages":"Article 100468"},"PeriodicalIF":0.9,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100468","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89997603","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}

{"title":"On the status of the radiolarian genus Spongoliva Haeckel, 1887 and the description of the genus Spongolivella n. gen","authors":"Paulian Dumitrică","doi":"10.1016/j.revmic.2020.100477","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100477","url":null,"abstract":"<div><p><span>The author erects a new genus<span> for the Quaternary artiscin radiolarian species </span></span><em>Spongoliva ellipsoides</em> Popofsky 1912. The genus <em>Spongoliva</em> Haeckel 1887 is a <em>nomen dubium</em><span> because none of its six species has been illustrated and, above all, its type species is Eocene in age, an epoch when the artiscins had not yet appeared.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"70 ","pages":"Article 100477"},"PeriodicalIF":0.9,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100477","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91657327","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}

{"title":"The Cenomanian–Turonian boundary event in Egypt: Foraminiferal turnover and carbon isotopic change","authors":"Sherif M. El Baz ,&nbsp;Ahmed A. Kassem","doi":"10.1016/j.revmic.2020.100463","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100463","url":null,"abstract":"<div><p>This study deals with the integration between geochemical data (carbon isotope and, total organic carbon) and foraminiferal turnover to track the Oceanic Anoxic Event 2 (OAE2) from the OCT-A8st1 well, which located in October field, central part of Gulf of Suez, Egypt. The studied well is subdivided into two formations, namely the Galala (Early–Late Cenomanian) and Abu Qada (Late Cenomanian–Early Turonian). Concerning the foraminiferal assemblage, agglutinated foraminifera dominate the Galala Formation, while planktonic taxa only occur within a few levels in the Abu Qada Formation. Due to the absence of keeled planktonic forms, the biostratigraphic framework is established on the integration between benthonic and planktonic foraminifera. Three biozones are recognized, including <em>Thomasinella aegyptia–Merlingina cretacea</em> Interval Zone (Early–Middle Cenomanian), <em>Thomasinella fragmentaria–Praebulimina aspera</em> Interval Zone (Middle–Late Cenomanian), and <em>Whiteinella archaeocretacea</em> Taxon Range Zone (Late Cenomanian–Early Turonian). Therefore, the Cenomanian–Turonian boundary interval (CTBI) is placed within the lower part of the Abu Qada Formation, which is characterized by the presence of black shales and low richness of both foraminifera and ostracods. A remarkable increase in TOC values is observed close to the CTBI. Also, the carbon isotope curve shows a distinctive positive δ¹³C anomaly at the same level of the maximum TOC. The comparison between the recorded δ¹³C data and those obtained from other sections worldwide, indicates that the base of the Turonian is placed directly above the δ¹³C excursion. Furthermore, the recorded foraminiferal community shows evidence for the deepening of the environment and extension of the oxygen minimum zone during the CTBI. This conclusion is based on a sequence of bioevents starting with the disappearance of some agglutinated benthic foraminifera, followed by the dominance of opportunistic groups including buliminids, whiteinellids and heterohelicids. Consequently, the studied well may be considered as a local reference section for OAE2.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100463"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100463","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91992493","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}

{"title":"Seasonal living coccolithophore distribution in the enclosed coastal environments of the Thessaloniki Bay (Thermaikos Gulf, NW Aegean Sea)","authors":"Dimiza M.D. ,&nbsp;Koukousioura O. ,&nbsp;Michailidis I. ,&nbsp;Dimou V.-G. ,&nbsp;Navrozidou V. ,&nbsp;Aligizaki K. ,&nbsp;Seferlis M.","doi":"10.1016/j.revmic.2020.100449","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100449","url":null,"abstract":"<div><p><span>Living coccolithophores collected from a yearly time interval, January to December 2016, at the SP1 station of the Thessaloniki Bay, an enclosed coastal environment located in the inner part of the Thermaikos Gulf (Northwestern Aegean Sea) were analyzed to determine their seasonal variation and evaluate the effects of environmental factors on their density, species composition and distribution. Our results showed that coccolithophores constituted a significant component of the phytoplankton<span> community and were characterized by the dominance of few opportunistic species, as an impact of eutrophic environmental conditions. Temperature seasonal cycle and the variations in nutrient inputs from riverine and/or anthropogenic sources seem to control the seasonal pattern of coccolithophores. </span></span><em>Emiliania huxleyi</em> with densities as high as ∼4.0 × 10⁵ cells l⁻¹ predominated during the late spring–early summer, whereas a strong dominance of <em>Gephyrocapsa oceanica</em> with densities ∼2.0 × 10⁵ cells l⁻¹ was observed during the late summer and the autumn. <em>Emiliania huxleyi</em> appeared to dominate the coccolithophore assemblages once more during the winter; while <em>Helicosphaera carteri</em> was continuously present during the wintertime (exceeding ∼2.7 × 10³ cells l⁻¹). <em>Emiliania huxleyi</em><span> was entirely represented by morphotype type A in the studied samples. Morphometric analysis of </span><em>E. huxleyi</em><span> coccoliths indicated that the population is dominated by lightly calcified forms, although an increase of more heavily calcified coccoliths was observed during late autumn-early spring in line with the well-documented seasonal succession pattern of </span><em>E. huxleyi</em> type A forms in the Aegean Sea.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100449"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100449","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92070083","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}

{"title":"New dasycladalean alga with unusual two types of laterals from the Palaocene deposits of Konavle, SE of Dubrovnik (Dinarides, Croatia)","authors":"Branko Sokač,&nbsp;Tonći Grgasović","doi":"10.1016/j.revmic.2020.100464","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100464","url":null,"abstract":"<div><p>A new distinctive calcareous alga <em>Filippoporella barattoloi</em> n. gen n. sp., coming from the rich Lower Palaeogene algal assemblage (partly known from <span>Radoičić, 2004</span>) of the Pločice locality, is described. It is characterized by slightly claviform thallus, bearing whorls with two types of laterals of different form and function. In the lower (older) part of thallus, whorls contain sterile laterals of the <em>Dissocladella</em>-type. Going upwards, globular fertile laterals with several secondaries start to appear, at first irregularly inserted between sterile whorls. In the upper part of the thallus, whorls with different types of laterals alternate quite regularly, giving the appearance to that part of the thallus similar to <em>Chinianella</em>, as distinct from the lower, <em>Dissocladella</em>-type, part. The accompanying algal assemblage points to the uppermost Selandian-Thanetian, which is also confirmed by the accompanying foraminiferal species.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100464"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100464","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91992816","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}

{"title":"Pleistocene ostracods from central and southern Greece: The marine and brackish record","authors":"P. Papadopoulou,&nbsp;M. Tsoni,&nbsp;G. Iliopoulos","doi":"10.1016/j.revmic.2020.100448","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100448","url":null,"abstract":"<div><p>Ostracods<span><span><span> are important palaeoenvironmental tools and for this reason the study of their palaeoecology and geographic distribution must be enhanced in the frame of a unified geographic approach. The PLOSTRAC’s project (Study of Pleistocene ostracods from central and southern Greece: Digital imaging of a palaeoenvironmental tool) main aim is to study the Pleistocene ostracods deriving from sedimentary successions from central and southern Greece and provide a bibliographic database of Pleistocene ostracod-bearing sequences in the study area accompanied by SEM pictures of the identified species. This output can be used as a reference point for future studies not only in Greece but also in the Eastern </span>Mediterranean region as well. This work presents new data from brackish and marine Pleistocene sequences in Peloponnesus, the Ionian Islands (Zakynthos and Cephalonia) and Crete. A total number of 166 taxa were identified from the processed samples. The ostracods belong mainly to the families Trachyleberididae and Hemicytheridae. The studied </span>sedimentary sequences<span> cover the entire Pleistocene Age and range between purely brackish to deep marine assemblages. Moreover, according to both the palaeoenvironmental interpretation of the studied sections and the published literature, across Northern Peloponnesus during the Pleistocene mostly brackish to shallow marine conditions prevailed. Moving to the south and also to the Ionian Islands and Crete deep marine palaeoenvironments were observed.</span></span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100448"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100448","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91992815","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}

{"title":"Reprint of “Radiolaria from the lower Cenomanian (Upper Cretaceous) of Crimea. Part 1. Spumellaria”","authors":"Liubov Bragina,&nbsp;Nikita Bragin","doi":"10.1016/j.revmic.2020.100458","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100458","url":null,"abstract":"<div><p><span><span>Well-preserved Late Cretaceous (early Cenomanian) </span>radiolarians were recovered from two sections in Crimea: Bodrak River and Sel’-Bukhra Mountain sections. Abundant and diverse representatives of order Spumellaria were recognized and studied. Four new radiolarian species: </span><em>Becus naidini</em> nov. sp., <em>B. tauricus</em> nov. sp., <em>Praeconocaryomma</em>? <em>bodrakensis</em> nov. sp., and <em>Savaryella</em>? <em>nikishini</em> nov. sp. were described. Moreover, stratigraphical ranges of species <em>Archaeospongoprunum sphaericum</em> Bragina, <em>Crucella lata</em> (Lipman), <em>Patellula cognata</em> O’Dogherty, <em>P. verteroensis</em> (Pessagno), <em>Spongodiscus quasipersenex</em> Bragina were exactly defined (their lower limits are expanded to the lower Cenomanian). The upper limit of stratigraphic range of \"<em>Cenodiscus</em>\" <em>alievi</em><span> Pessagno is expanded to the lower Cenomanian. Our results suggest that two rare taxa \"</span><em>Cenodiscus</em>\" <em>alievi</em> Pessagno (California Coast Ranges) and <em>Spongodiscus quasipersenex</em> Bragina (West Sakhalin Mountains) are reported for the first time in the Tethyan regions.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100458"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100458","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92123557","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}

{"title":"Recent planktonic foraminifera population and size response to Eastern Mediterranean hydrography","authors":"Stergios Zarkogiannis,&nbsp;George Kontakiotis,&nbsp;Assimina Antonarakou","doi":"10.1016/j.revmic.2020.100450","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100450","url":null,"abstract":"<div><p>The eastern Mediterranean Sea is a partially isolated sea where excess evaporation over precipitation or riverine discharge results in large north to south gradients in temperature and salinity. Eastern Mediterranean Sea surface sediment samples from 28 locations spanning from the North Aegean to the Levantine Sea have been examined for recent planktonic foraminiferal distribution. In addition to determining the relative abundance of 12 species that have been identified, the average intraspecific size along with the size of the overall faunal pattern was also examined. The quantitative analysis performed on &gt;125<!--> <!-->μm fraction reveals pronounced and complex changes in planktonic foraminiferal assemblages that do not parallel the intraspecific size variation and sea surface temperature (SST). On the contrary, foraminifera most of the times are slightly larger in the colder and fresher North Aegean and become progressively smaller toward the warmer Levantine Sea. We conclude that the relationship between planktonic foraminifera shell size and abundance or SST are either absent or weaker than previously reported for other regions and that in E. Mediterranean assemblages size may be mainly related to nutrient availability.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100450"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91992817","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}

{"title":"Publisher s notes","authors":"","doi":"10.1016/j.revmic.2020.100478","DOIUrl":"https://doi.org/10.1016/j.revmic.2020.100478","url":null,"abstract":"","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"69 ","pages":"Article 100478"},"PeriodicalIF":0.9,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100478","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92123558","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}

{"title":"Lithology and planktic foraminifera biostratigraphy of Aptian–Albian boundary as encountered in Jebel Sidi Salem (northeastern Tunisia)","authors":"Meriem Hichi ,&nbsp;Nejla Sekatni-Aich ,&nbsp;Mohamed Gharbi ,&nbsp;Mohamed Ben Youssef","doi":"10.1016/j.revmic.2020.100445","DOIUrl":"10.1016/j.revmic.2020.100445","url":null,"abstract":"<div><p>The Aptian–Albian boundary has long been difficult to identify along the foreland basin of the Tunisian Atlas, although ammonites occur in the Fahden Formation. The revision of Aptian–Albian series from Jebel Sidi Salem, in the northeastern part of the Tunisian Ridge, provides new data for the recognition of this boundary. The Jebel Sidi Salem section contains a rich succession of planktic foraminifers’ index species which document a complete marine record of Aptian–Albian boundary with no sign of redeposition. Six zones of planktic foraminifera have been identified through the late Aptian to middle Albian; including <em>Globigerinelloides algerianus</em> Zone, <em>Hedbergella trocoidea</em> Zone, <em>Planomalina cheniourensis</em> Zone, <em>Paraticinella eubejaouensis</em>/<em>Ticinella roberti</em> Zone, <em>Hedbergella planispira</em> Zone and <em>Ticinella primula</em> Zone.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"68 ","pages":"Article 100445"},"PeriodicalIF":0.9,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.revmic.2020.100445","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124215827","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}