Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
36
datasets available to search
ShareScore release 0.9.0
Dataset results
36 results for “Katian”
Data for: Insights for modern invasion ecology from biotic changes of the Clarksville Phase of the Richmondian Invasion (Ordovician, Katian)
<p>The frequency of biotic invasions in modern ecosystems is increasing due to global trade moving taxa outside their native ranges and climate change facilitating establishment of taxa in previously inhospitable regions. Thus, developing a holistic understanding of biotic invasions and how they impact ecosystems over different timescales—from annual to geologic time scales—is vital. Herein we examine a geologically brief invasion event, the Clarksville Phase of the Richmondian Invasion. Prior analyses have established general ecological and evolutionary patterns across the entire Richmondian Invasion, but recent sequence stratigraphic refinement makes analysis of individual invasion pulses possible for the first time. We examine biotic change across the Clarksville Phase and identify invasion impacts on diversity, paleocommunity composition, and niche stability. Invader arrival and success were strongly linked to increased propagule pressure facilitated by sea level changes. Invaders initially colonized deep subtidal environments and then moved offshore facilitated by rapid niche evolution during the invasion interval. Invasive taxa that attained the largest population sizes belonged to previously underutilized ecological guilds. Overall, the introduction of the invasive taxa resulted in increased diversity that was maintained into the post-invasion interval accompanied by a change in community composition in which the invaders became dominant paleocommunity members. Combined these analyses document a biotic invasion facilitated by climate change which increased local diversity through invaders occupying underutilized ecospace and competition-related niche contraction on millennial time scales. Developing a long-term perspective to accompany shorter-term studies facilitates predicting the long-term impacts of modern invasions and creating better-informed policies and practices. </p>
Micro-CT analysis of Katian radiolarians from the Malongulli Formation, New South Wales, Australia, and implications for skeletogenesis
<p><span>A diverse and well-preserved radiolarian assemblage from the Malongulli Formation, New South Wales, Australia contains 13 species representing ten genera and six families. One new genus: <em>Wiradjuri</em> n. gen. is introduced to accommodate pre-Devonian single-shelled entactiniid taxa and one new species: <em>Secuicollacta</em> <em>malongulliensis</em> n. sp. is recorded together with some previously described forms. The micro-structure of the 'rotasphaerid structure/primary unit' and the 'ectopic spicule' are investigated to validate their roles as fundamental units in the Secuicollactidae together with comprehensive documentation of the previously enigmatic <em>Pseudorotasphaera</em> internal skeleton.</span></p> <p><span>The results of this investigation suggest that, among all radiolarian genera that survived the </span>Late Ordovician Mass Extinction <span>event (LOME) and transitioned into the Silurian, <em>Secuicollacta</em>, <em>Haplotaeniatum</em>, and <em>Palaeoephippium</em> maintained stable body plans during the transition and were more successfully established. The selective advantages these lineages had during the LOME, were most likely spontaneous outcomes of the mode of structural development involving sequential skeletogenesis and a tendency to evolve towards simpler body plans. </span></p>
Data from: Katian (Late Ordovician) trilobites of the North Qilian Mountains and their palaeogeographical implications for the Proto-Tethys Archipelagic Ocean (PTAO)
Open the record for dataset details and reuse information.
Shifting speciation mode and biogeographic patterns during the Late Ordovician (Sandbian-Katian) in Laurentian brachiopods (Atrypida, Anazygidae)
Open the record for dataset details and reuse information.
Data for: Insights for modern invasion ecology from biotic changes of the Clarksville Phase of the Richmondian Invasion (Ordovician, Katian)
Open the record for dataset details and reuse information.
Micro-CT analysis of Katian radiolarians from the Malongulli Formation, New South Wales, Australia, and implications for skeletogenesis
Open the record for dataset details and reuse information.
Data from: Trepostomate bryozoans from the upper Katian (Upper Ordovician) of Morocco: gigantism in high latitude Gondwana platforms
A study of the Upper Ordovician trepostomate bryozoans belonging to the families Amplexoporidae and Monticuliporidae, from the eastern Anti-Atlas of Morocco, is presented here. They occur in the marly to fine-grained limestone, intermediate unit of the Khabt-el-Hajar Formation, late Katian in age, representing outer-ramp depositional environments. They inhabited the highest paleolatitude known for a bryozoan fauna during the Ordovician, estimated at more than 65–70ºS. A total of 11 species of the genera Anaphragma, Atactoporella, Homotrypa, Monotrypa, Monticulipora, and Prasopora are described. Three species are already known from the equatorial-tropical paleocontinents of Baltica, Laurentia, and Siberia: Anaphragma mirabile, Monotrypa jewensis, and Prasopora falesi. Four new taxa are described:Anaphragma undulata, Atactoporella moroccoensis, Monticulipora globulata, and Monticulipora irregularis. The two species of Anaphragma and the one of Atactoporella display significantly larger zoarial sizes than congeneric species, representing gigantism among bryozoans. Polar gigantism is rejected for the two species of Anaphragma as is gigantism related to photosynthetic endosymbionts. An alternative proposal for their giant size is their long zoarial life span due to their well-balanced, robust branching form, with a relatively wide basal supporting surface, adapted to unconsolidated substrates in environments below wave base. Their great stability in outer-ramp environments, with infrequent storms, would allow the zoaria to grow for an extended time and reach large sizes before being overturned and buried. Atactoporella moroccoensis, has both zoaria and zooecia gigantic, suggesting a hypothesis of polar gigantism.
Data from: Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario
The Brechin Lagerstätte (Katian, Ordovician) from the Lake Simcoe region of Ontario, Canada, contains a diverse array of echinoderms. Here, we describe seven disparid and two hybocrinid crinoids (Subclass Pentacrinoidea, Infraclass Inadunata), including a new disparid species belonging to the Anomalocrinidae (Order Homocrinida). In total, the disparids include Anomalocrinus astrictus n. sp.; Cremacrinus guttenbergensis Kolata, 1975; Cremacrinus inaequalis Billings, E., 1859; Daedalocrinus bellevillensis Billings, W.R., 1883; Eustenocrinus springeri Ulrich, 1925; Iocrinus trentonensis Walcott, 1883; and Isotomocrinus tenuis Billings, E., 1857b; and the hybocrinids include Hybocrinus tumidus Billings, E., 1857a and Hybocystites problematicus Wetherby, 1880. Previously known from only the holotype, three additional specimens of E. springeri expand our understanding of this unusual crinoid. Nomenclatural acts include the following: the recommendation of Warn and Strimple (1977), who designated Daedalocrinus kirki as a junior synonym of Daedalocrinus bellevillensis is followed; Hybocrinus pristinus Billings, E., 1858 is designated a junior synonym of Hybocrinus tumidus; and previous decisions are followed herein to retain Hybocystites eldonensis (Parks, 1908) as a junior synonym of Hybocystites problematicus. Although probably assignable to Anomalocrinus, the aberrant crinoid Glaucocrinus falconeri is designated a nomen dubium. Iocrinus similis (Billings, E., 1857a) is also designated a nomen dubium.
Data from: Katian (Upper Ordovician) conodonts from Wales
Middle and Upper Katian conodonts are previously known in the British Isles from relatively small collections obtained from a few localities. The present study is mainly based on 17 samples containing more than 17,000 conodont elements from an approximately 14 m thick succession of the Sholeshook Limestone in a road cut near Whitland, South Wales that yielded a diverse fauna of more than 40 taxa. It is dominated by representatives of Amorphognathus, Aphelognathus/Plectodina, and Eocarniodus along with several coniform taxa. Representatives of Decoriconus, Istorinus and Sagittodontina are reported from the Ordovician of UK for the first time. The fauna is a typical representative of the British Province of the Atlantic Realm and includes a mixture of taxa of North American, Baltoscandic, and Mediterranean affinities along with pandemic species. Based on the presence of many elements of Amorphognathus ordovicicus and some morphologically advanced specimens of A. superbus, the Sholeshook Limestone is referred to the lower A. ordovicicus Zone. Most of the unit is also coeval with Zone 2 of the Cautleyan Stage in the British regional stage classification, and Stage Slice Ka3 of the middle Katian Stage in the global stratigraphical classification, an age assignment consistent with data from trilobites, graptolites, and chitinozoans. The unusually large collection of M elements of Amorphognathus provides insight into the complex morphological variation of this element of some Katian species of this genus. The Sholeshook conodont fauna is similar to those of the Crûg and Birdshill limestones but differs in several respects from the slightly older ones from the Caradocian type area in the Welsh Borderland. Although having some species in common, the Sholeshook conodont fauna clearly differs from coeval Baltoscandic faunas, and is even more different in composition compared with equivalent North American Midcontinent faunas.
Data from: An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids
Open the record for dataset details and reuse information.
Data from: Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario
Open the record for dataset details and reuse information.
Data from: Katian (Upper Ordovician) conodonts from Wales
Open the record for dataset details and reuse information.
Data from: Trepostomate bryozoans from the upper Katian (Upper Ordovician) of Morocco: gigantism in high latitude Gondwana platforms
Open the record for dataset details and reuse information.
FIGURE 1 in Diverse endobiotic symbiont fauna from the late Katian (Late Ordovician) of Estonia
FIGURE 1. Map illustrating the exposure of the Ordovician in Estonia and location of studied localities. 1- Saxby North, 2- Saxby, 3- Hosholm, 4- Paluküla, 5- Vohilaid, 6- Sutlema.
Fig. 11. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 11. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 201009. A1, A2, transverse sections. A3, longitudinal section. B. NIGP 201008. B1, B2, transverse sections. B3, longitudinal section.
Text-fig. 4. Palaeogeographical reconstruction of the Katian (after Popov et al. 2011, modified) showing geographical distribution of the Middle and Late Ordovician craniides and craniopsides. White arrow = Boda Event expansion of craniiates and craniopsides to Perunica; black arrow = Hirnantian low-latitude expansion of the Hirnantia Fauna. in Lingulate And Craniate Brachiopods From The Top Of The Králův Dvůr Formation (Latest Katian) And Their Contribution To Palaeogeography
Text-fig. 4. Palaeogeographical reconstruction of the Katian (after Popov et al. 2011, modified) showing geographical distribution of the Middle and Late Ordovician craniides and craniopsides. White arrow = Boda Event expansion of craniiates and craniopsides to Perunica; black arrow = Hirnantian low-latitude expansion of the Hirnantia Fauna.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.