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1,817 results for “Late Cretaceous”
Fig. 1 in Morphology Of The Late Cretaceous Crocodylomorph Shamosuchus Djadochtaensis And A Discussion Of Neosuchian Phylogeny As Related To The Origin Of Eusuchia
Fig. 1. Holotype of Shamosuchus djadochtaensis AMNH FR 6412.
Fig. 3 in Sankuchemys, a New Side-Necked Turtle (Pelomedusoides: Bothremydidae) from the Late Cretaceous of India
Fig. 3. Key to figure 2.
Data from: A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to high-latitude continental environment
<p>Fossil plants, including large trunks, stems, some branches, and twigs, were collected from the Maastrichtian (68.9 Mya), upper Dorotea Formation in the Magallanes/Austral Basin, 16 km north of the Cerro Guido-Las Chinas complex in the southern Chilean Magallanes region. These fossil trunks range from 0.2 m to 2.2 m in length. Petrographic slides were made in three sections (transverse, radial, and tangential) and analysed under a light microscope to study the permineralised fossils. The woods and stems belong to Austroginkgoxylon gen. et sp. nov., Agathoxylon antarcticum, Podocarpoxylon paradoxi sp. nov., Podocarpoxylon mazzonii, Palmoxylon subantarcticae, and Nothomalvaceoxylon magallanense gen.et sp. nov. The growth rings of gymnosperms and anatomical characters of angiosperms were analysed to obtain palaeoecological data. Interactions between gymnosperm roots growing into the secondary xylem of an angiosperm (nurse logs) are recorded. The data obtained from the fossil woods suggest warm and humid conditions in this southern South American locality during the Late Cretaceous, providing a unique opportunity to study continental environments at high southern latitudes, which are poorly represented on a global scale.</p>
Morphometric analysis of the Late Cretaceous Placenticeras of Alabama, USA: Sexual dimorphism, allometry, and implications for taxonomy
<p>A traditional typological approach to taxonomy often does not adequately account for intraspecific variation and can result in taxonomic oversplitting. For many groups, including ammonoids of the <em>Placenticeras</em> genus, intraspecific variation documented in recent studies (e.g., ontogenetic changes, sexual dimorphism, polymorphism) challenges the historic proliferation of species names. Here, we used a population approach to taxonomy and quantitatively evaluated morphometric variation in a sample of Late <em>Cretaceous</em> (Santonian -Campanian) <em>Placenticeras</em> from Alabama and adjacent counties.</p> <p>We used linear mixed models (LMMs) to characterize how morphological variables scale with conch size across the sample, exploiting mixed longitudinal data to evaluate individual variation in growth and inform interpretations of multivariate analyses. Extended LMMs incorporating geological formation evaluated morphological changes through time. Principal component analysis and clustering analysis were then used to evaluate the number of distinct clusters that emerged in multivariate morphospace independent of previous taxon name assignments.</p> <p>Discontinuous scaling relationships and distinct clusters in multivariate space suggest sexual dimorphism characterized by differences in adult size, and secondarily, shape. Previous <em>Stantonoceras</em> and <em>Placenticeras</em> assignments broadly overlap in our morphospace, failing to justify this historic distinction (as sexual dimorphs, or as genera or subgenera). <em>Placenticeras</em> conch morphology and ornament placement changed through time, suggesting a potential utility for coarse (stage-level) biostratigraphy. However, temporal changes were not associated with distinct clusters in morphospace and our data fail to support the plethora of reported species names. As few as one or two (successive) species may be present in our sample (representing 130 years of collection effort). In addition to highlighting the need for a significant taxonomic revision of the <em>Placenticeras</em> genus, this study demonstrates the utility of LMMs for distinguishing between different sources of morphological variation, improving interpretations of morphospace under a population approach to taxonomy, and maximizing the amount of ontogenetic information that can be obtained non-destructively.</p>
FIGURE 6 in New occurrences of Belonostomus (Teleostomorpha: Aspidorhynchidae) from the Late Cretaceous of the North American Gulf Coastal Plain, USA
FIGURE 6. Belonostomus sp. SMU 77677. 1, ventral view; 2, lateral view. Scale bars equal 10 mm.
Discovery of Ultra-depleted Melt Inclusion in Late Cretaceous Intraplate Basaltic Andesites in South China
<p>1. Supporting Information, including supplemental methods and figures.</p> <p>2. Datasets:</p> <p>Dataset S1. Compiled data including basaltic rocks from South China, MORBs, and Hawaii OIBs.</p> <p>Dataset S2. Whole-rock major oxide, trace element, and Sr-Nd-Pb-Hf isotopic compositions.</p> <p>Dataset S3. Olivine chemical compositions.</p> <p>Dataset S4. Measured and corrected major element compositions of melt inclusion.</p> <p>Dataset S5. Measured and corrected trace element compositions of melt inclusion.</p> <p>Dataset S6. Pb isotopic compositions of melt inclusion.</p>
Discovery of Ultra-depleted Melt Inclusion in Late Cretaceous Intraplate Basaltic Andesites in South China
<p>1. Suporting informations, including methods, figures, and one table. </p> <p>2. Six Datasets, including one dataset for basaltic rocks from different settings and five datasets for chemical and isotopic compositions of whole-rocks and melt inclusions. </p>
Insect herbivory for Catula gettyi, a late Cretaceous laurel from Utah, USA
<p class="Body">The Upper Cretaceous (Campanian Stage) Kaiparowits Formation of southern Utah, USA, preserves abundant plant, invertebrate, and vertebrate fossil taxa. Taken together, these fossils indicate that the ecosystems preserved in the Kaiparowits Formation were characterized by high biodiversity. Hundreds of vertebrate and invertebrate species and over 80 plant morphotypes are recognized from the formation, but insects and their associations with plants are largely undocumented. Here, we describe a new fossil leaf taxon, <i>Catula gettyi </i>gen et. sp. nov. in the family Lauraceae from the Kaiparowits Formation. <i>Catula gettyi</i> occurs at numerous localities in this deposit that represent ponded and distal floodplain environments. The type locality for <i>C. gettyi</i> has yielded 1,564 fossil leaf specimens of this species, which provides the opportunity to circumscribe this new plant species. By erecting this new genus and species, we are able to describe ecological associations on <i>C. gettyi </i>and place these interactions within a taxonomic context<i>. </i>We describe an extensive archive of feeding damage on <i>C</i>.<i> gettyi</i> caused by herbivorous insects, including more than 800 occurrences of insect damage belonging to five functional feeding groups indicating that insect-mediated damage on this taxon is both rich and abundant. <i>Catula gettyi</i> is one of the best-sampled host plant taxa from the Mesozoic Era, a poorly sampled time interval, and its insect damage is comparable to other Lauraceae taxa from the younger Late Cretaceous Hell Creek Flora of North Dakota, USA.</p>
Text-fig. 1. Geological map of South Bohemian Basins. in Plant Mesofossils From The Late Cretaceous Klikov Formation, The Czech Republic
Text-fig. 1. Geological map of South Bohemian Basins.
Plate IV Daspletosaurus torosus, NMC 8506 in Tyrannosaurs from the Late Cretaceous of western Canada
Plate IV Daspletosaurus torosus, NMC 8506. Forelimb seen in ventral aspect.
Plate III Daspletosaurus torosus, NMC 8506. Forelimb seen in dorsal aspect. in Tyrannosaurs from the Late Cretaceous of western Canada
Plate III Daspletosaurus torosus, NMC 8506. Forelimb seen in dorsal aspect.
Figure 9 in Tyrannosaurs from the Late Cretaceous of western Canada
Figure 9 Daspletosaurus torosus, reconstruction of the palate in ventral aspect, based on NMC 8506.
Figure 7 in Tyrannosaurs from the Late Cretaceous of western Canada
Figure 7 Daspletosaurus torosus, reconstruction of the skull in dorsal aspect, based on NMC 8506.
Data from: Estimates of late Early Cretaceous atmospheric CO2 from Mongolia based on stomatal and isotopic analysis of Pseudotorellia
<p>Our dataset includes 115 leaf cuticles related to two species of <em>Pseudotorellia</em> Florin from three stratigraphically similar samples at the Tevshiin Govi lignite mine in central Mongolia (~119.7–100.5 Ma, Aptian–Albian, Cretaceous). We apply a well-vetted paleo-CO<sub>2</sub> proxy based on leaf gas-exchange principles (the Franks model) to those leaves for paleo-CO<sub>2</sub> reconstruction, which requires leaf stomata and carbon isotope analysis. All cuticle measurements are summarized in this dataset. </p>
FIGURE 14 in Bone histology reveals the first record of titanosaur (Dinosauria: Sauropoda) from the Late Cretaceous of Bulgaria
FIGURE 14 (caption on next page).
FIGURE 9 in Bone histology reveals the first record of titanosaur (Dinosauria: Sauropoda) from the Late Cretaceous of Bulgaria
FIGURE 9 (caption on next page).
FIGURE 10 in Bone histology reveals the first record of titanosaur (Dinosauria: Sauropoda) from the Late Cretaceous of Bulgaria
FIGURE 10 (caption on next page).
FIGURE 11 in Bone histology reveals the first record of titanosaur (Dinosauria: Sauropoda) from the Late Cretaceous of Bulgaria
FIGURE 11 (caption on next page).
FIGURE 6 in Bone histology reveals the first record of titanosaur (Dinosauria: Sauropoda) from the Late Cretaceous of Bulgaria
FIGURE 6 (caption on next page).
Fig. 23 in Osteology and relationships of Libanopycnodus wenzi gen. et sp. nov. and Sigmapycnodus giganteus gen. et sp. nov. (Pycnodontiformes) from the Late Cretaceous of Lebanon
Fig. 23. Pseudopycnodus nardoensis (Taverne, 1997), cloacal region of specimen CLC S-467.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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