Robert A Depalma

Robert A Depalma
The University of Manchester · Department of Earth and Environmental Sciences

About

18
Publications
30,587
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252
Citations
Citations since 2017
11 Research Items
201 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (18)
Preprint
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The Chicxulub impact triggered a global impact winter at the Cretaceous-Paleogene (K-Pg) boundary 66 million years ago. Yet, the exact killing mechanisms of the K-Pg mass extinction including the wipe-out of non-avian dinosaurs, remain poorly constrained. Here, we present paleoclimate simulations based on new sedimentological constraints from an ex...
Article
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The end-Cretaceous Chicxulub impact triggered Earth’s last mass-extinction, extinguishing ~ 75% of species diversity and facilitating a global ecological shift to mammal-dominated biomes. Temporal details of the impact event on a fine scale (hour-to-day), important to understanding the early trajectory of mass-extinction, have largely eluded previo...
Article
The flat‐end surfaces of dinosaur vertebral centra led to the presumption that intervertebral discs occupied the space between their vertebrae. A set of fused hadrosaur vertebrae allowed that hypothesis to be tested. The Tyrannosaurus rex responsible for this pathology did not escape unscathed. It left behind a tooth crown that had fractured. Fragm...
Article
Full-text available
Significance The Chicxulub impact played a crucial role in the Cretaceous–Paleogene extinction. However the earliest postimpact effects, critical to fully decode the profound influence on Earth’s biota, are poorly understood due to a lack of high-temporal-resolution contemporaneous deposits. The Tanis site, which preserves a rapidly deposited, ejec...
Article
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Most dromaeosaurids were small- to medium-sized cursorial, scansorial, and arboreal, sometimes volant predators, but a comparatively small percentage grew to gigantic proportions. Only two such giant “raptors” have been described from North America. Here, we describe a new giant dromaeosaurid, Dakotaraptor steini gen. et sp. nov., from the Hell Cre...
Article
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Feeding strategies of the large theropod, Tyrannosaurus rex, either as a predator or a scavenger, have been a topic of debate previously compromised by lack of definitive physical evidence. Tooth drag and bone puncture marks have been documented on suggested prey items, but are often difficult to attribute to a specific theropod. Further, postmorte...
Article
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Examination of preserved skin from a duckbill dinosaur revealed disruption of the normal scale pattern and replacement by granulation tissue. Wrinkles radiating outward from the scar document wound contraction similar to that seen in modern injuries. This is the first unequivocal report of dinosaur tissue response to dermal pathology and evidences...
Article
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The first damselfly in Late Cretaceous amber from South Dakota is described and figured.The specimen preserves the forewing apex of a possible hemiphlebiid, a group of relict damselflies today that were apparently widespread and diverse during the Cretaceous.
Article
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Insects, the most diverse of living organisms today, inhabit virtually every terrestrial and freshwater ecosystem on earth. Yet the strata of the Upper Cretaceous Hell Creek Formation, although deposited in a luxuriant subtropical biome during the initial diversification of flowering plants, until now have revealed practically no insect fossils. He...
Article
This research examines a Konzentrat-Lagerstätte, the Bone Butte site, in the Upper Cretaceous Hell Creek Formation of South Dakota. Field data from a diverse multispecific bonebed in Harding County, South Dakota, including sedimentologic, stratigraphic, taphonomic, floral, and faunal observations, are used to reconstruct the depositional history, d...

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