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.
340
datasets available to search
ShareScore release 0.9.0
Dataset results
340 results for “Late Oligocene”
FIGURE 5 in A new group of late Oligocene mysticetes from México
FIGURE 5. Tlaxcallicetus guaycurae (MU EcSj5/06/31), cranium, frontal view.
FIGURE 6 in A new group of late Oligocene mysticetes from México
FIGURE 6. Tlaxcallicetus guaycurae (MU EcSj5/06/31), cranium, posterior view.
FIGURE 4 in A new group of late Oligocene mysticetes from México
FIGURE 4. Tlaxcallicetus guaycurae (MU EcSj5/06/31), cranium, ventral view.
Text-fig. 1. Location of the study area. in The Late Oligocene Macroflora Of Zsámbék, Central Hungary
Text-fig. 1. Location of the study area.
Latest Eocene to mid-late Oligocene calcareous nannoplankton assemblage relative abundance counts and coccolith size measurements: IODP Site U1553
<p>Calcareous nannoplankton are a major group of calcifying marine phytoplankton. Their distribution, productivity and cellular morphological traits are important factors in the role of calcareous nannoplankton in marine ecosystem functions, including the production and export of organic and inorganic carbon. </p> <p>Using morphometric and assemblage data collected from latest Eocene to mid-late Oligocene sediments International Ocean Discovery Program (IODP) Site U1553, Campbell Plateau in the high latitude southwestern Pacific Ocean, we reconstructed the size structure and associated biogeochemical traits (size-fractionated and total community particulate organic and inorganic carbon) of the community through the Oligocene to investigate the impact of climate-driven changes in community composition on calcareous nannoplankton biogeochemistry.</p> <p> </p> <p>The datasets presented in this data record are associated with the manuscript:</p> <p>Sheward, R. M., Herrle, J. O., Fuchs, J., Gibbs, S. J., Bown, P. R. and Eibes, P. M. Biogeochemical traits of a high latitude South Pacific Ocean calcareous nannoplankton community during the Oligocene, to be submitted to <em>Paleoceanograpy and Paleoclimatology</em> in June 2024.</p> <p> </p> <p>This data record contain two primary datasets generated for this study:</p> <ol> <li>assemblage composition (relative <em>coccolith</em> abundance) of the latest Eocene-earliest Oligocene calcareous nannoplankton community</li> <li>morphometric data for the coccolith size of the ten most common morphogroups in the assemblage in this time interval (<em>Chiasmolithus</em>, <em>Clausicoccus subdistichus</em>, <em>Coccolithus</em>, <em>Cyclicargolithus</em>, <em>Reticulofenestra</em>, <em>Sphenolithus</em>, <em>Discoaster</em> and <em>Zygrhablithus bijugatus</em>).</li> </ol> <p> </p> <p>Correspondence should be addressed to: Rosie Sheward (sheward@em.uni-frankfurt.de).</p>
FIGURE 7. Probably a in New dragonflies and damselflies (Odonata) from the late Oligocene of Enspel (Rhineland-Palatinate, SW Germany)
FIGURE 7. Probably a stem-Libellulidae, PE 2001/5195-LS, hind wing. Scale bar is 10 mm.
Fig. 7 in A new raninoid crab (Decapoda, Brachyura, Raninidae) from the early Oligocene (late Rupelian) of Italy
Fig. 7 -?Ranina bouilleana A. Milne Edwards, 1872. MNHN R03540 (x 0.9).
FIGURE 9 in Angiosperm pollen grains from the Cuayuca Formation (Late Eocene to Early Oligocene), Puebla, Mexico
FIGURE 9. Index taxa recovered from the Cuayuca Formation, Puebla.
Figure 13 in Craniodental anatomy of late Oligocene archaeohyracids (Notoungulata, Mammalia) from Bolivia and Argentina and new phylogenetic hypotheses
Figure 13. Archaeohyrax suniensis sp. nov., partial mandible, MNHN-BOL-V 009682. Scale bar = 1 cm.
Figure 15 in Craniodental anatomy of late Oligocene archaeohyracids (Notoungulata, Mammalia) from Bolivia and Argentina and new phylogenetic hypotheses
Figure 15. Archaeohyrax suniensis sp. nov., paratype, MNHN-BOL-V 007147. Scale bar = 1 cm.
Figure 6 in Late Oligocene mesotheriids (Mammalia, Notoungulata) from Salla and Lacayani (Bolivia): implications for basal mesotheriid phylogeny and distribution
Figure 6. Isolated left petro-tympanic, MNHN-BOL-V 006906, cerebellar view. Scale bar = 1 cm.
Figure 7. Trachytherus alloxus, SAL 235. A, ventral view. B in Late Oligocene mesotheriids (Mammalia, Notoungulata) from Salla and Lacayani (Bolivia): implications for basal mesotheriid phylogeny and distribution
Figure 7. Trachytherus alloxus, SAL 235. A, ventral view. B, left lateral view. Scale bar = 1 cm.
Dataset for terrestrial climate and vegetation change in the western Tasmanian region from the late Eocene to late Oligocene
<p>Datasets accompanying Terrestrial climate and vegetation change in the western Tasmanian region from the late Eocene to late Oligocene by Amoo et al.</p> <p>Supplementary table S1: Raw palynomorph assemblage data, total counts, ODP Site 1168 </p> <p>Supplementary table S2: Sporomorph-based climate estimates including MAT, WMMT, CMMT and MAP </p> <p>Supplementary table S3: Sporomorph diversity indices</p> <p>Supplementary table S4: Nearest living relatives, botanical affinity, and climate range of individual taxa.</p>
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales)
<p><span>The first size reduction (FSR) in the <em>Reticulofenestra-Gephyrocapsa-Emiliania (RGE)</em> lineage (Order Isochrysidales) which occurred in the early Oligocene (~ 32 Ma), is of great significance for understanding the lilliput effect that has affected the coccolithophore communities from late Eocene to this day. We conducted a morphologic analysis on the coccoliths of <em>Reticulofenestra</em> species that lived during the late middle Eocene to early Oligocene (~40-31 Ma), using marine sediments from the South Atlantic Ocean. Our data show increasing size and decreasing abundance of the large species during the late Eocene, leading to their disappearance at the FSR, and a concurrent decrease in the size variability of the small-medium-sized coccoliths whose diameter of the central opening had become very reduced. Although the cosmopolitan late Paleogene through Neogene size decrease in coccolithophores has been linked to the concomitant long-term decline in global <em>p</em>CO2, we suggest here that the FSR was the result of environmental destabilization caused by the expansion of eutrophic environments following the late Eocene establishment of overturning circulation associated with ice build-up on Antarctica. This study also leads us to propose a hypothetical model that links coccolith morphology of species of the <em>RGE </em>lineage and trophic resources in the upper ocean: the small- to medium-sized, r-selected coccolithophores with smaller coccolith central opening live in nutrient-rich waters where they rely mostly on photosynthesis and little on mixotrophy; whereas the larger, K-selected species with larger coccolith central opening live in oligotrophic waters where they are more dependent on mixotrophy.</span></p>
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales)
Open the record for dataset details and reuse information.
Data from: Late Oligocene caviomorph rodents from Contamana, Peruvian Amazonia
The Deseadan South American Land Mammal Age (late Early Oligocene – Late Oligocene) attests to a time of great diversification in the caviomorph rodent fossil record. Nevertheless, Deseadan rodent-bearing localities in Neotropical lowlands are few and poorly known. Here we describe the rodent assemblages from two Late Oligocene localities, near Contamana, Loreto, Peru. Seven taxa are new to science: Palaeosteiromys amazonensis gen. et sp. nov., Plesiosteiromys newelli gen. et sp. nov., Loretomys minutus gen. et sp. nov., Scleromys praecursor sp. nov, Ucayalimys crassidens gen. et sp. nov., Chambiramys sylvaticus gen. et sp. nov. and Chambiramys shipiborum gen. et sp. nov. These rodent faunas show that caviomorphs were relatively diverse in Peruvian Amazonia during the Late Oligocene, with the co-occurrence of at least three extant superfamilies: Erethizontoidea, Octodontoidea and Chinchilloidea. Additionally, they mark the earliest known occurrences of Scleromys, of a small erethizontid closely related to Microsteiromys and of an adelphomyine closely reminiscent of Ricardomys (all taxa previously restricted to Miocene localities thus far). They also document a form potentially related to Eosallamys (previously known from around the Eocene–Oligocene transition at Santa Rosa in Peruvian Amazonia). Finally, the geographical range of Adelphomyinae and of Deseadomys is widely expanded to the lower latitudes of South America for the Deseadan interval. The latter elements, in addition to the record of a very primitive species of Scleromys, suggest the absence of palaeogeographical and palaeoenvironmental barriers within the southern cone of South America before the Oligocene–Miocene transition.
FIGURE 4 in A new species of Trachytherus (Notoungulata: Mesotheriidae) from the late Oligocene (Deseadan) of Southern Peru and the middle latitude diversification of early diverging mesotheriids
FIGURE 4. Manual elements of Trachytherus spp. A, Trachytherus ramirezi, right distal ulna and radius (with unfused radial epiphysis), carpals (missing trapezium and pisiform) and proximal metacarpals II–V (MUSM 963); B, right carpals (missing trapezoid and pisiform) and damaged Mc I–V (MUSM 965) of small indeterminate species of Moquegua; C, nearly complete right manus of cf. T. spegazzinianus (MUSM 668); left manus of T. alloxus (UF 91933, reversed to show as right). Abbreviations: cun, cuneiform; ln, lunate; Mc, metacarpal; mg, magnum; pis, pisiform; sc, scaphoid; td, trapezoid; tm, trapezium. Scale bar applies to all.
FIGURE 2 in A new species of Trachytherus (Notoungulata: Mesotheriidae) from the late Oligocene (Deseadan) of Southern Peru and the middle latitude diversification of early diverging mesotheriids
FIGURE 2. Holotype Trachytherus ramirezi sp. nov., MUSM 350. A, right lateral view of cranium and mandible; A', detail of external auditory region of A; B, skull in left lateral view to illustrate the damaged side, revealing the mesodont-to-hypsodont premolars, somewhat hypsodont (rooted) M1, and hypselodont M2–3; C, ventral view of skull and palate; and D, occlusal view of jaw and lower dentitions. Abbreviations: bc, braincase; crm, crista meatus; eam, external auditory meatus; ets, epitypmanic sinus; gf, glenoid fossa; msty, metastyle; pgp, post glenoid process; rtp, retrotympanic process; and smf, suprameatal fossa. Scale bar at D applies to all, except the slightly enlarged A'.
FIGURE 1 in A new species of Trachytherus (Notoungulata: Mesotheriidae) from the late Oligocene (Deseadan) of Southern Peru and the middle latitude diversification of early diverging mesotheriids
FIGURE 1. Map of South America showing the approximate locations of sites that have yielded remains of Oligocene mesotheriids: stars are to indicate locations of undescribed/unclassified Tinguirirican mesotheriid materials; octagons indicate the widely dispersed, Deseadan Trachytherus spegazzinianus; and diamonds indicate localities containing all other recognized species of Trachytherus (Deseadan). The dashed oval circumscribes the area we refer to as the "Bolivian Oroclinal Region," an area that contains all four recognized species of Trachytherus (see text for details). Background map modified from NASA image.
FIGURE 7 in A new species of Trachytherus (Notoungulata: Mesotheriidae) from the late Oligocene (Deseadan) of Southern Peru and the middle latitude diversification of early diverging mesotheriids
FIGURE 7. Phylogeny and historical biogeography of the Mesotheriidae. Cladograms of A and B were based upon the phylogenetic analysis in this study for the early diverging, non-mesotheriine mesotheriids (without the Deltran optimization given fig. 6) combined with the analysis of Croft et al. (2004) for the Mesotheriinae (see also Flynn et al. 2003). That of A includes the "published mesotheriid" (PM) dataset only, whereas B, the "undescribed plus published mesotheriids (U+PM), includes undescribed Tinguirirican material. Question marks indicate the uncertainties of affinities of the Tinguirirican taxa and that of an indeterminate mesotheriine Colhuehuapian (see text). Lines from taxon to map of South America are to indicate the general region(s) from which the taxa are known. The reconstructions of ancestral area presented here are based on the single character coding strategy (see Material and Methods). The bold lines of the cladogram indicate the evolution of the BOR distribution on the tree, whereas thin stems indicate distribution in SSA (see text for comments).
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.