Romain Amiot

Romain Amiot
French National Centre for Scientific Research | CNRS · Institut national des sciences de l'univers (INSU)

PhD

About

105
Publications
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Introduction
Romain Amiot currently works at the Institut national des sciences de l'univers (INSU), French National Centre for Scientific Research. Romain does research in Paleontology, Paleoclimatology and Geochemistry.

Publications

Publications (105)
Article
Four complete isolated neurocrania excavated during the nineteenth century in the Autun Basin (Sa^one-et-Loire, France) were used by Heyler & Poplin (1982) to erect two species: the symmoriiform Bibractopiscis niger and the xenacanthiform Orthacanthus commailli. However, the specimens have not been mechanically prepared and only a portion of their...
Article
Full-text available
Strategies used by marine vertebrates to regulate their body temperature can result in local variations, and the knowledge of these regional heterothermies is crucial for better understanding the thermophysiologies of extant and extinct organisms. In order to investigate regional heterothermies in vertebrates, we analysed the oxygen isotope composi...
Poster
Chondrichthyans, or cartilaginous fishes, are represented by the sharks, rays, skates, and chimaeras. Many of them, like the eel-like Xenacanthiformes and their closest relative ‘Ctenacanthiformes’, or the odd-finned Symmoriiformes, are known only as fossils, so their evolutionary history is debated. Studies on the neurocranium (the part of the sku...
Article
Full-text available
The Gauls, who occupied most of Western Europe during the Second Iron Age (500 BCE–50 BCE), exploited their environ- ment through farming and trading of local resources. The study of carbon (δ13C), nitrogen (δ15N), and sulfur (δ34S) stable isotopes of 8 humans and 12 animals from the Gallic site of Thézy-Glimont, Picardie, France, provides an insig...
Conference Paper
Les Xenacanthiformes sont un ordre de chondrichtyens, ou poissons cartilagineux. Ils sont apparus au Carbonifère inférieur en Europe et se sont rapidement répandus dans le monde. Leur diversité maximale est enregistrée autour de la transition Carbonifère-Permien en Europe. Ils étaient l'un des rares ordres de chondrichtyens à traverser l'extinction...
Preprint
Strategies used by marine vertebrates to regulate their body temperature can result in local variations, and the knowledge of these regional heterothermies is crucial for better understanding the thermophysiologies of extant and extinct organisms. In order to investigate regional heterothermy in vertebrates, we analysed the oxygen isotope compositi...
Article
The endocranial structures of the sebecid crocodylomorph Zulmasuchus querejazus (MHNC 6672) from the Lower Paleocene of Bolivia are described in this article. Using computed tomography scanning, the cranial endocast, associated nerves and arteries, endosseous labyrinths, and cranial pneumatization are reconstructed and compared with those of extant...
Conference Paper
Xenacanthiformes forms an Order of elasmobranchs or stem-chondrichthyans known from the early Carboniferous to the upper Triassic. Their maximum diversity occurs around the Carboniferous-Permian boundary, notably in Europe. In France, they are known since the 19th century in the Autun basin (Saône-et-Loire), particularly in the Muse oil-shale bed....
Article
Full-text available
The evolution of thermometabolism in pseudosuchians (Late Triassic to the present) remains a partly unsolved issue: extant taxa (crocodilians) are ectothermic, but the clade was inferred ancestrally endothermic. Here we inferred the thermometabolic regime of two neosuchian groups, Goniopholididae (Early Jurassic to Late Cretaceous) and Dyrosauridae...
Conference Paper
Les chondrichtyens inclus aujourd’hui les requins, les raies et les chimères, mais ne sont que le pale reflet de leur diversité passée. Nombre d'entre eux, tels les Xenacanthiformes et leur proche parent les ‘Ctenacanthiformes’, ou encore les Symmoriiformes ne sont connus qu’à l’état fossile. La rareté de fossiles plus ou moins complets rend l’étud...
Article
The Xenacanthiformes from Central and Eastern European deposits have been extensively studied, but the systematics of the species from the French Carboniferous–Permian Autun Basin (Saône-et-Loire) remains debated. Numerous xenacanthiform remains are still identified under the doubtful genus ‘Expleuracanthus’, and many of them consist of isolated do...
Presentation
The internal endocranial structures of an undescribed atoposaurid crocodylomorph from the Sao Khua Formation (Cretaceous: Berriasian-Barremian) in the North-East of Thailand are investigated. The specimen is comparable in size and external morphology to Theriosuchus grandinaris Lauprasert et al. 2011 but is preserved with the braincase uncrushed, c...
Article
Lufeng County in Southwest China is one of the most famous lagerstätten in which Early Jurassic dinosaurs can be found. The reason for the burial of large body size dinosaur fossils at this site is still an enigma, although it could be attributed to either suitable habitats or good preservation conditions. Both of these factors are indirectly regul...
Article
The hard and soft tissue remains of a pre-Hispanic population of the Gran Canaria Island at six different archaeological localities were studied using 14C dating and stable isotope compositions. Radiocarbon dating indicates island occupation ranging from the beginning of the 7th to the mid-14th century. We analyzed the oxygen isotope compositions o...
Article
Full-text available
Recent studies demonstrate that many avialan features evolved incrementally prior to the origin of the group, but the presence of some of these features, such as bird-like brooding behaviours, remains contentious, in non-avialan dinosaurs. Here we report the first non-avialan dinosaur fossil known to preserve an adult skeleton atop an egg clutch th...
Article
We investigated the environmental conditions that prevailed in continental ecosystems recorded in sedimentary deposits of Japan during the Cretaceous through the analysis of oxygen and carbon isotope compositions of phosphate (δ¹⁸Op) and apatite-bound carbonate (δ¹⁸Oc and δ¹³Cc) of vertebrate teeth and bones. Local surface water δ¹⁸Ow values were c...
Article
The Roman Warm Period (from ≈300 BCE to ≈300 CE) is a climatic optimum, which had a key role in the development of the Roman civilization. This study provides new Mean Air Temperatures (MATs) inferred from the oxygen isotope composition of 80 bones and teeth apatite from 8 humans and 8 animals of the Gallic site of Thézy-Glimont, Picardie, France,...
Article
Full-text available
Millions of mummified birds serving for religious purpose have been discovered from archeological sites along the Nile Valley of Egypt, in majority ibises. Whether these birds were industrially raised or massively hunted is a matter of heavy debate as it would have a significant impact on the economy related to their supply and cult, and if hunted...
Article
The late Permian dicynodont Endothiodon is characterized by its specialized feeding system, most notably manifested in its long rows of post-canine teeth and corresponding keratinous surfaces. This specialisation has fuelled discussion of not only the masticatory biomechanics in Endothiodon but also of its diet and ecology. To shed light on the lat...
Article
We describe a large, nearly completely preserved sauropod humerus from the Lower Cretaceous Xinlong Formation of Napai Basin, Fusui County, Guangxi Zhuang Autonomous Region, southern China. It was excavated from the quarry that produced the holotypic specimen of the titanosauriform Fusuisaurus zhaoi. With a preserved length of 183.5 cm, the newly c...
Article
The Canary Islands, east of the North Atlantic Ocean (27°N-29°N), are under the influence of the Canary Current, the descending branch of the North Atlantic Gyre, which is modulated by coastal upwelling off North-West Africa. They constitute strategic sites for palaeoclimatic reconstructions, especially for the Last Interglacial (LIG, 129 to 116 ky...
Article
Teleosauridae and Metriorhynchidae were thalattosuchian crocodylomorph clades that secondarily adapted to marine life and coexisted during the Middle to Late Jurassic. While teleosaurid diversity collapsed at the end of the Jurassic, most likely as a result of a global cooling of the oceans and associated marine regressions, metriorhynchid diversit...
Article
The fossil wood genus Xenoxylon is reported in-situ for the first time in Thailand. It originates from the Indosinian terrane, from the Mesozoic continental redbeds of the Phu Kradung Formation (Khorat Group). Palinspatic reconstruction, palaeobiogeography and correlation with other occurrences of the genus, in southern China as well as in Vietnam,...
Article
Full-text available
Reconstructing the living environment of extinct vertebrates is often challenging due to the lack of proxies. We propose a new proxy to the living environment based on the combined oxygen and sulphur stable isotope analysis of vertebrate hydroxyapatite. We tested this isotopic proxy to 64 biogenic apatite (bones) samples that represent a wide spect...
Article
The study of paleoclimates enables us to improve and better constrain climate models in order to forecast future climate variations. Marine Isotope Stage 11 (MIS11), which began around 425,000 yr BP and lasted about 65,000 yr, is a warm isotope stage of paramount importance, because the astronomical configuration was similar to the one characterizi...
Article
Full-text available
Fossiliferous bioclastic calcarenites of fluvial-aeolian origin were deposited between 4.3 ± 0.7 Ma and 3.78 ± 0.71 Ma in Lanzarote, Canary Archipelago. Climate was characterized by warm and steppic conditions. The fossil assemblage contains land snail shells that recrystallized into calcite as revealed by Raman spectroscopy. Carbon and oxygen isot...
Article
The Abrahamskraal Formation of South Africa has a diverse middle Permian (Guadalupian) fossil tetrapod fauna comprising largely basal therapsids and pareiasaurian parareptiles. Knowledge on the paleoecology of these animals is limited because inferences of many ecological traits in mid-Permian tetrapods are based on deductions from morphology. Whil...
Article
The large range of stable oxygen isotope values of phosphate‐bearing minerals and dissolved phosphate of inorganic or organic origin requires the availability of in‐house produced calibrated silver phosphate of which isotopic ratios must closely bracket those of studied samples. We propose a simple protocol to synthesise Ag3PO4 in a wide range of o...
Article
The chemical and isotopic compositions of biogenic apatite are important geochemical markers, which can suffer modifications during fossilisation. Compared with modern ones, fossil apatites generally exhibit variations in carbonate content, enrichment in fluorine, incorporation of trace elements and an increase in crystallinity parameters. Detailed...
Conference Paper
Full-text available
The late Capitanian mass extinction (˜260 million years ago) represents one of the greatest biotic perturbations of the Phanerozoic and was the earliest mass extinction to affect terrestrial tetrapods and ecosystems. In the past, this extinction has been largely associated with taxonomic loss and ecological restructuring in marine environments but...
Article
Full-text available
The fish-to-tetrapod transition-followed later by terrestrialization-represented a major step in vertebrate evolution that gave rise to a successful clade that today contains more than 30,000 tetrapod species. The early tetrapod Ichthyostega was discovered in 1929 in the Devonian Old Red Sandstone sediments of East Greenland (dated to approximately...
Article
Large predators are overabundant in mid-Cretaceous continental dinosaur assemblages of North Africa. Such unbalanced ecosystem structure involves, among predatory dinosaurs, typical abelisaurid or carcharodontosaurid theropods co-occurring with long-snouted spinosaurids of debated ecology. Here, we report calcium (Ca) isotope values from tooth enam...
Article
Full-text available
The late Capitanian mass extinction (~260 million years ago) represents one of the greatest biotic perturbations of the Phanerozoic and was the earliest mass extinction to affect terrestrial tetrapods and ecosystems. In the past, this extinction has been largely associated with taxonomic loss and ecological restructuring in marine environments but...
Article
Earthquakes or explosive eruptions generate tsunami, which are at the origin of thick and chaotic coastal sediments. These commonly fossiliferous deposits are formed instantaneously at the historical or geological timescale and therefore have the potential to provide snapshot records of past climates. In Crete, near the city of Palaikastro, crops o...
Article
Quantification of paleoprecipitation during the Last Glacial is a key element to reconstruct palae- oclimates. Recently, fossil calcite granules have been identified in loess sequences with high contents in specific horizons. In this study, we explored for the first time the potential of this new bio-indicator as a climatic proxy for precipitation...
Article
Full-text available
Remains of a coelacanth specimen are described from Rhaetian deposits of the Var Department, southeastern France. They comprise the lower part of a branchial apparatus associated with a left lower jaw and a basisphenoid. Osteological features of the angular and basisphenoid and the teeth ornamentation allow the inclusion of the specimen in the maws...
Data
Stable oxygen isotope compositions of phosphate (δ¹⁸Op) and carbonate (δ¹⁸Oc) of Permo-Triassic tetrapod teeth and bones reported along with their stratigraphic position, estimated age, palaeolatitudes and their carbonate content. Asterisks represent diagenetically altered values. DOI: http://dx.doi.org/10.7554/eLife.28589
Article
Full-text available
The only true living endothermic vertebrates are birds and mammals, which produce and regulate their internal temperature quite independently from their surroundings. For mammal ancestors, anatomical clues suggest that endothermy originated during the Permian or Triassic. Here we investigate the origin of mammalian thermoregulation by analysing apa...
Article
Full-text available
In order to determine the incubation temperature of eggs laid by non-avian dinosaurs, we analysed the oxygen isotope compositions of both eggshell carbonate (δ¹⁸Oc) and embryo bone phosphate (δ¹⁸Op) from seven oviraptorosaur eggs with preserved in ovo embryo bones. These eggs come from the Upper Cretaceous Nanxiong Formation of Jiangxi Province, Ch...
Article
The Egyptian civilization arose and developed during the Predynastic period (7300 to 5000 years before present or BP e.g. before 1950), synchronous with a large scale climatic event, the end of the African Humid Period. The decrease in the amount of precipitation associated with this climate change could have started earlier in Ethiopia (maybe as s...
Article
Full-text available
Oxygen isotope compositions of bone phosphate (δ18Op) were measured in broiler chickens reared in 21 farms worldwide characterized by contrasted latitudes and local climates. These sedentary birds were raised during an approximately 3 to 4-month period, and local precipitation was the ultimate source of their drinking water. This sampling strategy...
Article
Construction work of the Highway A65 led the top of the Burdigalian ‘Molasses de l'Armagnac’ Formation to outcrop in two close localities near the town of Bazas and Marimbault, situated on the western edge of the Aquitaine Basin, France. From this formation, a rich fossil assemblage has been recovered and includes both marine and terrestrial fossil...
Article
The oxygen isotope compositions of bones (n = 11) and teeth (n = 20) from 12 Sudanese individuals buried on Sai Island (Nubia) were analysed to investigate the registration of the evolution of the Nile environment from 3700 to 500 years BP and the potential effects of ontogeny on the oxygen isotope ratios. The isotopic compositions were converted i...
Article
The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited in a non-marine, fluvial environment, has yielded a diverse assemblage of vertebrates. The study of the shark teeth from the Xinlong Formation revealed the presence of teeth of Acrorhizodus khoratensis that do not appear to correspond to a jaw position r...
Article
Full-text available
The Arctic hosts an extraordinary wealth of terrestrial fossil biotas of Late Cretaceous age representing a diverse and highly productive near-polar ecosystem that has no modern analogue. Compared to the rest of the Late Cretaceous Maastrichtian plant diversity was at its lowest and the temperature regime the coolest, yet the semi-open forests supp...
Article
Ontogenetic variation is documented within many dinosaur species, but extreme ontogenetic changes are rare among dinosaurs, particularly among theropods. Here, we analyze 19 specimens of the Jurassic ceratosaurian theropod Limusaurus inextricabilis, representing six ontogenetic stages based on body size and histological data. Among 78 ontogenetic c...
Article
Full-text available
Oxygen and carbon isotope compositions of fossil bird eggshell calcite (δ18Ocalc and δ13Ccalc) are regularly used to reconstruct paleoenvironmental conditions. However, the interpretation of δ18Ocalc values of fossil eggshells has been limited to qualitative variations in local climatic conditions as oxygen isotope fractionations between calcite, b...
Article
Full-text available
Several studies of the marine sedimentary record have documented the evolution of global climate during the Permo-Triassic mass extinction. By contrast, the continental records have been less exploited due to the scarcity of continuous sections from the latest Permian into the Early Triassic. The South African Karoo Basin exposes one of the most co...
Article
Rationale: In ecological studies, the sulfur isotope compositions (δ(34) S values) of soft tissues (e.g. hair, skin, nail, muscle, collagen) allow the determination of both past and present-day living environments of organisms. However, technical limitations have so far prevented reliable sulfur isotope analyses of minerals having low sulfur conte...
Article
Full-text available
A mammalian dentary discovered in the Coniacian Ashizawa Formation (Fukushima, northeastern Japan) is described. The specimen is a fragment of the horizontal ramus of a left edentulous dentary with five alveoli, the distal four of which are plugged with broken roots. Based on the morphologies of the dentary and the roots, it is considered to be of...
Article
Oxygen isotope compositions of tooth enamel increments in theropod dinosaurs are investigated as potential proxies of climate seasonality. Six teeth of large carnivorous theropods collected from four Cretaceous formations deposited under contrasted climates have been sampled. These teeth have been analyzed for the oxygen isotope compositions of the...
Article
Full-text available
Estimating the locomotion type of fossil ground birds is necessary for a better understanding of their ecology. Until now, only one method has allowed us to estimate the locomotion of fossil ground birds, but its application is complicated in the majority of fossil cases because it requires data from the three bones from the same hindlimb of one in...
Article
Full-text available
The vertebrate assemblage from the Early Cretaceous non-marine Xinlong Formation of the Napai Basin, in the south-western part of Guangxi Zhuang Autonomous Region (southern China), is reviewed. The assemblage includes chondrichthyans (at least six species of hybodont sharks including Hybodus, Thaiodus, Heteroptychodus and Acrorhizodus ), actinopter...
Article
The European record of continental vertebrates during the Earliest Cretaceous (Berriasian) is usually based on accumulation assemblages in littoral localities where faunas of various living environments and ecologies are mixed. A recently excavated site located in the southwest of France (Cherves-de-Cognac) corresponds to a hyper-saline lagoonal en...
Article
Full-text available
During the Mesozoic and Cenozoic, four distinct crocodylomorph lineages colonized the marine environment. They were conspicuously absent from high latitudes, which in the Mesozoic were occupied by warm-blooded ichthyosaurs and plesiosaurs. Despite a relatively well-constrained stratigraphic distribution, the varying diversities of marine crocodylom...