Cretaceous–Paleogene boundary
Geological boundary between time periods
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| 2024 |
Cretaceous–Paleogene extinction event
During et al. critically reevaluated previous studies, challenging the methodological approach of the Depalma et al. research and questioning the accuracy of their isotopic data and conclusions.
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| 2024 |
Ornithopoda
Fonseca et al. conducted a phylogenetic analysis of the Ornithopoda clade, producing a new cladogram that further refined the understanding of this dinosaur suborder's evolutionary relationships.
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| 2024 |
Thyreophora
André Fonseca and colleagues provided a formal PhyloCode definition for Thyreophoroidea, further refining the taxonomic classification.
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| 2022 |
Ornithischia
Norman and colleagues conducted a phylogenetic analysis that recovered Silesauridae members as forming an ancestral grade within Ornithischia, supporting earlier evolutionary trends for early ornithischian anatomy.
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| 2022 |
Sauropterygia
Simões et al. develop a new cladogram exploring Sauropterygian relationships, contributing to ongoing research into their evolutionary history.
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| 2021 |
Cretaceous–Paleogene extinction event
Depalma et al. conducted a study suggesting the extinction occurred during the spring-summer range, further refining the timing of the mass extinction event.
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| 2021 |
Ornithopoda
Ornithopoda was given a formal definition under the PhyloCode, specifically defined as 'The largest clade containing Iguanodon bernissartensis but not Pachycephalosaurus wyomingensis and Triceratops horridus'.
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| 2021 |
Ornithopoda
Iguanodontia received a formal definition under the PhyloCode, defining it as the smallest clade containing specific dinosaur species while explicitly excluding Hypsilophodon foxii.
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| 2021 |
Thyreophora
An international research group led by Daniel Madzia registered ornithischian clades under the International Code of Phylogenetic Nomenclature, providing standardized definitions for Thyreophora and Eurypoda.
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| 2021 |
Ornithischia
Daniel Madzia and colleagues revised the internal classification of Ornithischia, creating the new clade Saphornithischia and providing a comprehensive framework for taxonomic definitions.
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| 2021 |
Ornithischia
Paul-Emile Dieudonné and colleagues published a new phylogenetic study that significantly changed understanding of early ornithischian evolution by placing Heterodontosauridae within Marginocephalia.
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| 2020 |
Cretaceous–Paleogene extinction event
Scientific studies date the peak of Deccan Traps eruptions and global heating to approximately 200,000 years before the extinction event, leading paleontologist Michael Benton to conclude the Deccan Traps did not cause the extinction.
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| 2020 |
Thyreophora
David Norman revised the relationships of early thyreophorans in a monograph on Scelidosaurus, suggesting Stegosauria was the most basal branch.
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| January 2020 |
Cretaceous–Paleogene extinction event
Scientists reported that climate modeling of the extinction event favored the asteroid impact over volcanism as the primary cause.
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| October 2019 |
Cretaceous–Paleogene extinction event
Researchers detailed how the asteroid event rapidly acidified the oceans and produced long-lasting climate effects, explaining the mechanisms of the mass extinction.
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| 2018 |
Climate across Cretaceous–Paleogene boundary
A scientific study estimated early Palaeogene annual air temperatures at mid-latitude, averaging 23–29 °C, which is 5–10 °C higher than previous estimates.
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| 2017 |
Ornithopoda
A study naming Burianosaurus proposed a new node-based definition for Iguanodontia, including the last common ancestor of Iguanodon bernissartensis, Dryosaurus altus, Rhabdodon priscus, and Tenontosaurus tilletti.
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| 2017 |
Ornithischia
Matthew G. Baron and colleagues published a phylogenetic study suggesting ornithischians were closest to theropods in the clade Ornithoscelida, challenging the traditional Saurischia-Ornithischia split.
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| 2016 |
Cretaceous–Paleogene extinction event
A drilling project into the Chicxulub peak ring confirmed that the peak ring was composed of granite ejected from deep within the Earth, with minimal gypsum present.
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| 2015 |
Sauropterygia
Cladistic analysis places Sauropterygia within Pantestudines, further refining understanding of their taxonomic positioning.
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| 2013 |
Sauropterygia
M.S. Lee performs an analysis of turtle relationships using both fossil and genetic evidence, which resolves Sauropterygia as a paraphyletic assemblage of stem turtles.
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| 2013 |
Sauropterygia
Neenan and colleagues conduct a fossil evidence-based analysis of Sauropterygian relationships, producing a significant cladogram exploring their evolutionary connections.
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| 2010 |
Sauropterygia
Beginning of the 2010s: Several scientific analyses suggest that Sauropterygians are more closely related to archosaurs (birds and crocodilians) than to lepidosaurs (lizards and snakes).
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This contents of the box above is based on material from the Wikipedia articles Thyreophora, Sauropterygia, Climate across Cretaceous–Paleogene boundary, Cretaceous–Paleogene extinction event, Ornithopoda & Ornithischia, which are released under the Creative Commons Attribution-ShareAlike 4.0 International License.