Micropaleontology最新文献

{"title":"From the archives: The Micropaleontologist correspondents","authors":"J. A. Van Couvering","doi":"10.47894/mpal.67.6.07","DOIUrl":"https://doi.org/10.47894/mpal.67.6.07","url":null,"abstract":"A look back at the first contributors to this journal.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445858","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}

{"title":"Paleoenvironmental inferences based on benthic foraminifera from the Uitpa Formation (Guajira, Colombia)","authors":"Sofia Barragán Montilla, Alberto Sanchez Quinonez","doi":"10.47894/mpal.67.5.03","DOIUrl":"https://doi.org/10.47894/mpal.67.5.03","url":null,"abstract":"The Uitpa Formation is a lithostratigraphic unit that crops out in the Guajira peninsula, northeastern Colombia in the Cocinas Basin. This formation consists mainly of marly and argillaceous mudstones of gray to light brown color, intercalated with sandstone and calcarenite beds. The lower contact with de Siamana Formation is unconformable, and at the top the contact with the Jimol Formation is conformable at Uitpa. These units contain an abundant and diverse fauna of planktic and benthic foraminifera that has not been studied in detail yet. In this research, two outcrop sections from the upper Guajira containing the Uitpa Formation were analyzed: the Pisuuluu hill and Jososuwou creek sections. Planktic foraminifera were extracted and taxonomically classified, allowing to assign an age of Chattian (Late Oligocene) (planktic foraminifera biozones O6 - O7). This investigation presents for the first time in Colombia a paleoenvironmental reconstruction integrating various methodologies using quantitative and qualitative analyses in benthic foraminifera. From these analyses an outer neritic to upper bathyal paleodepth was inferred, with environments characterized by high organic matter inputs in eutrophic conditions for both sections. Oxygenation levels were higher in the Pisuuluu hill section, represented by high diversity heterogeneous assemblages, while for the Jososuwou creek section oxygenation was very low producing stressed environments and low diversity homogeneous assemblages.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445305","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}

{"title":"Fish Microremains from the Cutoff Formation (Roadian, Middle Permian) of the Guadalupe Mountains, West Texas, USA","authors":"A. Ivanov, A. Bakaev, M. Nestell, G. Nestell","doi":"10.47894/mpal.67.4.03","DOIUrl":"https://doi.org/10.47894/mpal.67.4.03","url":null,"abstract":"A new assemblage of diverse fish microremains from the Roadian Williams Ranch Member of the Cutoff Formation in the Guadalupe Mountains, West Texas is described. The chondrichthyan remains comprise symmoriiforms Stethacanthulus decorus, Kungurodus sp. and indeterminate taxa; ctenacanthiform Glikmanius myachkovensis; euselachian Sphenacanthus sp. and Hybodontiformes indet.; anachronistids Cooleyella amazonensis, Cooleyella sp. and Reifella lata Ivanov, n. gen., n. sp.; jalodontids Adamantina foliacea, Isacrodus marthae and Isacrodus sp.; indeterminate euchondrocephalian and chondrichthyans. Actinopterygian remains include the elonichthyid Alilepis texasensis Bakaev, n. sp., indeterminate platysomids and acrolepidids, indeterminate taxa and other osteichthyans. The assemblage includes the widely geographically distributed taxa Cooleyella amazonensis, Stethacanthulus decorus and Adamantina foliacea. The occurrence of last two species in the Cutoff Formation represents their youngest record in the world. Possible migration paths are proposed for Alilepis.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"52 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445535","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}

{"title":"Pseudoactinoporella Conrad 1970 (Family Bornetellaceae) revisited: A Lower Cretaceous corticated and capitulum-shaped, stalked Tethyan Dasycladale","authors":"F. Schlagintweit, K. Rashidi, I. Bucur, Hossain Kohkan, A. Akbari","doi":"10.47894/mpal.67.4.04","DOIUrl":"https://doi.org/10.47894/mpal.67.4.04","url":null,"abstract":"Based on material from the area of Rafsanjan, Central Iran (P.? iranica Bucur et al.), and southeastern France (type-species P. fragilis Conrad), the genus Pseudoactinoporella Conrad is revisedwith respect to thallusmorphology and suprageneric classification. Reported as possessing a cylindrical or presumably club-shaped thallus, Pseudoactinoporella was assigned to the tribe Salpingoporellinae. In fact, P.? iranica represents a species displaying a capitulum-shaped, stalked thallus whose original description refered to the stalk only. The stalk of P.? iranica shows a spinose aspect due to individualized laterals and is well calcified. The “head” (capitulum) only preserves a thin wall displaying a pattern of cup-like depressions each with a central pore communicating with the fully cemented interior and interpreted as a cortex. P. fragilis is typically presented by trumpet-shaped fragments belonging to the stalk and the transition to the unpreserved (eroded? uncalcified?) “head”. For both species, a goniosporate reproduction type (= ampullae disposed laterally along the ramifications) is assumed herein. Due to these characteristics, it appears reasonable to leave apart the generic uncertainty of P. iranica as expressed in the original description. Consequently, Pseudoactinoporella is removed from the Salpingoporellinae and assigned to the family Bornetellaceae and the tribe Bornetelleae.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445591","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}

{"title":"Molecular and morphological taxonomy of living Ammonia and related taxa (Foraminifera) and their biogeography","authors":"B. Hayward, M. Holzmann, J. Pawłowski, J. H. Parker, Tushar Kaushik, Makoto S. Toyofuku, M. Tsuchiya","doi":"10.47894/mpal.67.3.01","DOIUrl":"https://doi.org/10.47894/mpal.67.3.01","url":null,"abstract":"Globally, one of the two most common shallow-marine and estuarine foraminiferal genera is Ammonia. Over the past 50 years, the majority of workers have identified specimens in this genus as belonging to just 1-3 cosmopolitan species - A. beccarii, A. tepida and A. parkinsoniana. This has been partly because of the problems of discriminating the Ammonia species based entirely on shell morphology and partly because of a 1974 laboratory study that claimed to have shown that all morphologies were merely ecophenotypic variants of one species - a conclusion that molecular studies have proven to be unequivocally wrong. In this study we recognize, describe and figure sixty-seven living species and infraspecies of Recent Ammonia and two closely-related genera (Acarotrochus, Pseudoeponides) from around the world and summarize their ecological and biogeographic distribution. Twenty-six species and two subspecies are recognized by DNA sequencing and shown to be morphologically distinguishable. A further 39 morphospecies and one subspecies, that have not yet been sequenced, have sufficiently distinct morphology to be recognized. Canonical variates analysis using 42 measured or assessed morphological characters shows that the majority of these species can be readily discriminated by their test morphologies, although a few of the less-ornamented molecular species are verging on being pseudocryptic. Molecular sequencing of the type species of Challengerella (C. bradyi) and Helenina (H. anderseni) places them within our Ammonia clade. Here we continue to recognize the morphologically highly distinct genera Pseudoeponides (subjective senior synonym of Helenina) and allied Acarotrochus. Twenty new species or subspecies are described (molecular T types in brackets): Ammonia abramovichae (T8), A. akitaae, A. aoteana australiensis (T5A), A. arabica (T26), A. ariakensis quiltyi, A. buzasi (T11), A. fajemilai, A. goldsteinae, A. goodayi, A. haigi (T25), A. hattai, A. jorisseni (T23), A. justinparkeri, A. kitazatoi (T10), A. morleyae (T12), A. shchedrinae, A. turgida almogilabinae (T22M), Acarotrochus lippsi, Pseudoeponides hottingeri and P. dubuissoni. Aneotype is designated for A. veneta (Schultze 1854) (T1). We recognize 67 Ammonia and related taxa in this study but speculate that there may be 30 or more additional living species that we are not yet confident to discriminate without molecular sequencing. Ammonia species live in most parts of the world between 62 degrees N (Faeroe Islands) and 55 degrees S (Strait of Magellan), where seasonal sea-surface temperatures are 4-10 degrees C and above. One estuarine species (A. veneta, T1) is cosmopolitan, euryhaline and eurythermic. Several species are widespread in one or two ocean regions (e.g., Atlantic and Mediterranean; South Pacific), whereas the majority are endemic to smaller areas (e.g., eastern Mediterranean; Caribbean-Gulf of Mexico). Eleven biogeographic \"provinces\" are recognized by cluster analysis of presence","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445365","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}

{"title":"The Paleocene of IODP Site U1511, Tasman Sea: A lagerstatte deposit for deep-water agglutinated foraminifera","authors":"M. Kaminski, L. Alegret, S. Hikmahtiar, A. Waśkowska","doi":"10.47894/mpal.67.4.02","DOIUrl":"https://doi.org/10.47894/mpal.67.4.02","url":null,"abstract":"Deep-water agglutinated Foraminifera (DWAF) are investigated from Paleocene sediments recovered from IODP Hole U1511B in the northeastern Tasman Sea. The recovered foraminifera display exceptional three-dimensional preservation: they are relatively unaltered by sediment diagenesis and compaction.We examined 27 samples fromCores U1511B-45R to -47R, and recovered over 70 species of DWAF. The assemblage consists entirely of “cosmopolitan” forms originally described from the Carpathians, Caucasus, Trinidad, and the western Tethys, implying that there is no provinciality among DWAF faunas in the world ocean.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445477","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}

{"title":"Globidiscus n. gen. (Foraminifera, Neodiscidae): A new Late Guadalupian genus from the Karakaya Complex, Northwest Anatolia (Turkey)","authors":"C. Okuyucu","doi":"10.47894/mpal.67.6.02","DOIUrl":"https://doi.org/10.47894/mpal.67.6.02","url":null,"abstract":"The Karakaya Complex in northern Turkey is classically subdivided into two units (Upper and Lower Karakaya Complex) and located in the Sakarya Composite Terrane. The Upper Karakaya Complex includes different blocks and tectonic slices within a Triassic matrix. A new genus of miliolid foraminifera (Cornuspiroidea, Neodiscidae) is established from the late Capitanian (latest Guadalupian) neritic limestone block from the Upper Karakaya Complex. The new genus Globidiscus is characterized by a large, inflated lenticular in the axial and subglobular in transverse section and involute test with well-developed flosculinisation and a porcelaneous wall with buttresses. It was probably derived from the Praeneodiscus-Neodiscus lineage in late Capitanian (Guadalupian).","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445695","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}

{"title":"Benthic foraminiferal biogeography in the southeast Caribbean Sea","authors":"B. Wilson, H. Carvajal-Chitty","doi":"10.47894/mpal.67.1.02","DOIUrl":"https://doi.org/10.47894/mpal.67.1.02","url":null,"abstract":"The SE Caribbean Sea is not ubiquitously oligotrophic. It is subject to the Caribbean Current, which is an extension of the Guiana Current and flows NW across the sea. It is also impacted by outflow from the Orinoco River, which produces a hypopycnal plume that is transported across the sea by the Caribbean Current, and by local upwelling, which occurs at distinct focuses. This paper uses non-metric multidimensional scaling (NMDS) to examine the impact of this oceanographic complexity on the distributions, based on species presence/absence, of neritic to upper bathyal benthic foraminifera. Sites within the ambit of the Orinoco Plume (Orinoco offshore, Trinidad East Coast Marine Area [ECMA], Trinidad North Coast Marine Area [NCMA), offshore NW Tobago, Bequia) are closely grouped by NMDS, despite the NCMA being subject to minor upwelling and Bequia only seasonally laying within the plume. The Paria and Araya Peninsula areas, though geographically close and both subject to upwelling, do not cluster closely. This indicates that the two upwelling focuses induced some biogeographic separation. The Isla La Tortuga, being bathed with oligotrophic water, plotted far from the eutrophic Orinoco Plume sites. The upwelling Paria Peninsula site, adjacent to the Orinoco Plume, yielded seventeen species of Bolivina (the greatest species richness for this genus of any of our sites), whereas Isla La Tortuga yielded only four. The Trinidad NCMA, likewise a site of upwelling, presented the second highest number of species of Bolivina, yielding twelve. That the Plataforma Deltana site plotted far from all others reflects its bathyal position beyond the Orinoco Plume.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70444718","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}

{"title":"A memorial to Robert D. Liska (1931-2021)","authors":"W. Berggren","doi":"10.47894/mpal.67.4.06","DOIUrl":"https://doi.org/10.47894/mpal.67.4.06","url":null,"abstract":"Robert D. Liska passed away on January 24, 2021. He died peacefully at home in the presence of his much-loved wife of 64 years. Born in 1931, Bob earned his MSc in Geology at San Diego State University. In 1963 Bob joined Texaco in Long Beach, California as a geologist. Two years later he joined Texaco International in Colombia, and in 1973 moved to Trinidad. Bob had a long association with Micropaleontology Press, and published several papers in Micropaleontology and in the Journal of Foraminiferal Research in the 1980’s and 1990’s. Bob leaves behind the legacy of his lifelong passion for micropaleontology and stratigraphy: his extensive and unique microfossil collection which will be housed at University College London, and his equipment which was donated to Texas A&M.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445347","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}

{"title":"Reophax bruneiensis n. sp. from the shallow-water environment of Brunei Darussalam","authors":"Sulia Goeting, A. Benedetti, A. Briguglio","doi":"10.47894/mpal.67.5.06","DOIUrl":"https://doi.org/10.47894/mpal.67.5.06","url":null,"abstract":"A new species of Reophax is documented from the shallow marine settings offshore Brunei Darussalam. The new taxon differs from other recent species of Reophax by its selective agglutination consisting mainly of tests of megalospheric specimens of Amphistegina. Reophax bruneiensis n.sp. differs from other known species in having a selectively agglutinated wall, few numbers of chambers increasing rapidly in size, and a terminal aperture not supported by any neck. This new species possibly acts as detritivore within the bottom sediments characterized by differentiated calcareous bioclasts and clay-sized siliciclasts derived by the river supply.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70446106","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}