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92 results for “trace fossils”
Data from: Walking on ashes: insect trace fossils from Laetoli indicate poor grass cover associated with early hominin environments
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Data from: Synchrotron-X-ray fluorescence analysis reveals diagenetic alteration of fossil melanosome trace metal chemistry
<p>A key feature of the pigment melanin is its high binding affinity for trace metal ions. In modern vertebrates trace metals associated with melanosomes, melanin-rich organelles, can show tissue- and taxon-specific distribution patterns. Such signals preserve in fossil melanosomes, informing on the anatomy and phylogenetic affinities of fossil vertebrates. Fossil and modern melanosomes, however, often differ in trace metal chemistry; in particular, melanosomes from fossil vertebrate eyes are depleted in Zn and enriched in Cu relative to their extant counterparts. Whether these chemical differences are biological, or taphonomic, in origin is unknown, limiting our ability to use melanosome trace metal chemistry to test palaeobiological hypotheses. Here, we use maturation experiments on eye melanosomes from extant vertebrates and synchrotron rapid scan-X-ray fluorescence analysis to show that thermal maturation can dramatically alter melanosome trace element chemistry. In particular, maturation of melanosomes in Cu-rich solutions results in significant depletion of Zn, likely due to low pH and competition effects with Cu. These results confirm fossil melanosome chemistry is susceptible to alteration due to variations in local chemical conditions during diagenesis and that maturation experiments can provide essential data on melanosome chemical taphonomy required for accurate interpretations of preserved chemical signatures in fossils.</p>
Fig. 2 in Acanthodian fish trace fossils from the Early Devonian of Spitsbergen
Fig. 2. Undichna septemsulcata isp. nov., Early Devonian, Spitsbergen. A. Sandstone slab (PMO 169.565) with two specimens of the fish trace Undichna septemsulcata isp. nov., and numerous arthropod trackways (ichnogenera: Merostomichnites, Diplichnites) preserved as delicate positive hyporelief. B, C. Enlarged section and line drawing of the holotype specimen of Undichna septemsulcata isp. nov., overprinted by two arthropod trackways (Diplichnites). D, E. Enlarged section and line drawing of the second, less well−preserved and narrower specimen.
Data from: Synchrotron-X-ray fluorescence analysis reveals diagenetic alteration of fossil melanosome trace metal chemistry
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Data from: Morphometric analysis of graphoglyptid trace fossils in two dimensions: implications for behavioral evolution in the deep sea
Graphoglyptids are deep-marine trace fossils, often found preserved as casts in positive relief on the base of turbidites. Previous analyses of the behavioral evolution of graphoglyptids suggested they were slowly diversifying, becoming optimized, and getting smaller over time until the Late Cretaceous, when a sudden increase in diversification occurred. This current study quantifies the morphology of approximately 400 different graphoglyptid specimens, ranging in age from the Cambrian to the present, in order to evaluate the behavioral evolutionary interpretations made previously. Results from this study indicate that although some general evolutionary patterns can be discerned, they are not as straightforward as previously reported. Different topological categories of trace fossils represent organisms' responses to evolutionary pressures in unique ways. While burrow widths of meandering traces were becoming smaller over time, as predicted by previous workers, the burrow widths of the network traces were becoming smaller only until the Late Cretaceous, when they started to get larger again. The times of significant evolutionary changes in behavior were not consistent among various topological categories, with some morphological features being affected in the Late Cretaceous and others during the beginning of the Eocene. It is likely that the behavioral evolution of graphoglyptids was influenced by deep-marine global influences linked to climate change, glaciation, and deep-ocean warming. These influences affected each topological group uniquely, suggesting that different species or genera of trace makers were creating each of the topological categories. This is contrary to the hypothesis that all graphoglyptids were created by closely related species.
Data from: Morphometric analysis of graphoglyptid trace fossils in two dimensions: implications for behavioral evolution in the deep sea
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Data from: Analytical tools for quantifying the morphology of invertebrate trace fossils
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FIGURE 5. Paleogallus vialovi Enushchenko and A in Revision of existing classification of fossil insect feeding traces and description of new ichnotaxa from Middle Jurassic sediments of Eastern Siberia (Russia)
FIGURE 5. Paleogallus vialovi Enushchenko and A. Frolov, ichnospec. nov. and Paleoovidus vasilenkoi Enushchenko & Frolov, ichnospec. nov. on the leaf of Ginkgo tapkensis (specimen No Iya-2011-14/17-1b, Holotype).
FIGURE 1 in Revision of existing classification of fossil insect feeding traces and description of new ichnotaxa from Middle Jurassic sediments of Eastern Siberia (Russia)
FIGURE 1. Geographical position and lithological structure of the samples locality with traces of the interaction of Mesozoic insects and plants 1. Coarse sandstones. 2. Medium grained sandstones, 3. Fine sandstones. 4. Siltstones. 5. Mudstones. 6. Coals. 7. Fossil plants. 8. Fossil plants with traces of insect life activity.
FIGURE 13 in Hidden in plain sight: reassessment of the pig-footed bandicoot, Chaeropus ecaudatus (Peramelemorphia, Chaeropodidae), with a description of a new species from central australia, and use of the fossil record to trace its past distribution
FIGURE 13. Principal Component Analysis of cranial a), dental b) and external c) measurements for Chaeropus ecaudatus ecaudatus (squares), C. e. occidentalis (diamonds) and C. yirratji sp. nov. (crosses).
FIGURE 9 in Hidden in plain sight: reassessment of the pig-footed bandicoot, Chaeropus ecaudatus (Peramelemorphia, Chaeropodidae), with a description of a new species from central australia, and use of the fossil record to trace its past distribution
FIGURE 9. Reconstruction of Chaeropus yirratji sp. nov. Artwork by Peter Schouten. Copyright WA Museum.
FIGURE 15 in Hidden in plain sight: reassessment of the pig-footed bandicoot, Chaeropus ecaudatus (Peramelemorphia, Chaeropodidae), with a description of a new species from central australia, and use of the fossil record to trace its past distribution
FIGURE 15. Phylogenetic analyses of Chaeropus taxa using Maximum Likelihood (ML) and Bayesian Inference (BI) approaches for the molecular data.
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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.