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migration

Comportement & Physiologie

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Comptonatus is an iguanodontid ornithopod dinosaur that lived about 125 million years ago, in the Early Cretaceous of what is now Europe. It was a medium sized herbivore at about 7 m in length, and weighed around 1 t in body mass. Fossilized footprints found near the original specimen indicate that Comptonatus was likely a herding animal. Comparisons between Comptonatus and other iguanodontids that lived around the same time and region show a high rate of diversity. This indicates there may have been pressure for speedy evolutionary adaptation in the region, or perhaps a high volume of migration.
Taxons Comptonatus

Comptonatus is an iguanodontid ornithopod dinosaur that lived about 125 million years ago, in the Early Cretaceous of what is now Europe. It was a medium sized herbivore at about 7 m in length, and weighed around 1 t in body mass. Fossilized footprints found near the original specimen indicate that Comptonatus was likely a herding animal. Comparisons between Comptonatus and other iguanodontids that lived around the same time and region show a high rate of diversity. This indicates there may have been pressure for speedy evolutionary adaptation in the region, or perhaps a high volume of migration.

migration Crétacé Crétacé inférieur spécimen +3
Identifier: ridpathshistoryo01ridp (find matches) Title: Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. Year: 1897 (1890s) Authors: Ridpath, John Clark, 1840-1900 Subjects: World history Ethnology Publisher: New York, Merrill & Baker Contributing Library: Mugar Memorial Library, Boston University Digitizing Sponsor: Boston University View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: the belief that the ap-pearance of man on the planet wouldoccur at the earliest practicable moment(so to speak), and that mankind wouldcontinue to nourish to the latest practi-cable date. It is one of the novel con- 82 GREAT RACES OF MANKIND. tradictions in the philosophy of a certainschool of thinkers that they would haveus believe that the earth, fitted up as itwere for the dwelling place of man, laygreen and virgin, waiting for his ap-pearance through eons of useless time—all this for no better reason than to sat-isfy the preconceptions of some impossi-ble system of chronology. Such short-sighted views of nature consistent with the astronomical andgeological preparation of the globe.Reason and fact alike require us to ac-cept as early a date for the appearanceof man as the design of the world andits conditions of habitability will admit.The results of reason must be acceptedin a world governed by law. That thedate of mans appearance was coinci-dent, or nearly coincident, with the Text Appearing After Image: .ANDSCAPE OF THE LOWER OOLITE (BEFORE THE AGE OF MAN).—Drawn by Riou. and of man we may at once dismiss asbelonging to the ignorance and blindnessRight reason de- of a former age. WhiledaTeforappS- the demands of right reason anceofman. ft0 not call for a limitless extension of man-life into the past, andwhile such a view is contradicted by sci-entific data which may not be doubted,a rational concept of the human race inrelation with the planetary life uponwhich it is maintained does call for aswide and far-reaching an arena as is astronomical changes in the characterof the earths orbit heretofore described,can not well be doubted by any onewhose mind has been freed from nar-row preconceptions on the subject.That our race career, measuring back-ward through the brief historical andtraditional periods of our ethnic life, hasextended far enough into the past tocover a considerable part of the planetlife with which it is associated, is a con-clusion warranted by every condition of TIME Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

Identifier: ridpathshistoryo01ridp (find matches) Title: Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. Year: 1897 (1890s) Authors: Ridpath, John Clark, 1840-1900 Subjects: World history Ethnology Publisher: New York, Merrill & Baker Contributing Library: Mugar Memorial Library, Boston University Digitizing Sponsor: Boston University View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: the belief that the ap-pearance of man on the planet wouldoccur at the earliest practicable moment(so to speak), and that mankind wouldcontinue to nourish to the latest practi-cable date. It is one of the novel con- 82 GREAT RACES OF MANKIND. tradictions in the philosophy of a certainschool of thinkers that they would haveus believe that the earth, fitted up as itwere for the dwelling place of man, laygreen and virgin, waiting for his ap-pearance through eons of useless time—all this for no better reason than to sat-isfy the preconceptions of some impossi-ble system of chronology. Such short-sighted views of nature consistent with the astronomical andgeological preparation of the globe.Reason and fact alike require us to ac-cept as early a date for the appearanceof man as the design of the world andits conditions of habitability will admit.The results of reason must be acceptedin a world governed by law. That thedate of mans appearance was coinci-dent, or nearly coincident, with the Text Appearing After Image: .ANDSCAPE OF THE LOWER OOLITE (BEFORE THE AGE OF MAN).—Drawn by Riou. and of man we may at once dismiss asbelonging to the ignorance and blindnessRight reason de- of a former age. WhiledaTeforappS- the demands of right reason anceofman. ft0 not call for a limitless extension of man-life into the past, andwhile such a view is contradicted by sci-entific data which may not be doubted,a rational concept of the human race inrelation with the planetary life uponwhich it is maintained does call for aswide and far-reaching an arena as is astronomical changes in the characterof the earths orbit heretofore described,can not well be doubted by any onewhose mind has been freed from nar-row preconceptions on the subject.That our race career, measuring back-ward through the brief historical andtraditional periods of our ethnic life, hasextended far enough into the past tocover a considerable part of the planetlife with which it is associated, is a con-clusion warranted by every condition of TIME Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

dent migration

Actualités

L'ADN ancien révèle le mystérieux effondrement des constructeurs de mégalithes européens
ADN migration génétique Homo sapiens origine humaine
L'ADN d'une tombe mégalithique française vieille de 5 000 ans révèle que les personnes enterrées avant et après un effondrement démographique n'avaient aucun lien génétique, ce qui indique une migration majeure après une crise dévastatrice. Ce changement a coïncidé avec de nouvelles traditions sociales et la disparition des communautés qui ont construit les monuments de pierre géants d'Europe.
08/07/2026 sciencedaily-fossils ⚙ Traduction automatique
L’« histoire d’amour » de Néandertal n’est pas ce que montre réellement l’ADN
ADN migration reproduction évolution génétique Homo sapiens
Les affirmations selon lesquelles les hommes de Néandertal « préféraient » les femmes Homo sapiens peuvent faire la une des journaux, mais les recherches sous-jacentes ne montrent pas réellement de romance préhistorique. Les preuves génétiques soulignent seulement un modèle inégal de transmission de l’ADN, qui pourrait avoir été façonné par la biologie, la migration ou l’organisation sociale. Des preuves archéologiques suggèrent que les groupes néandertaliens auraient pu suivre des traditions selon lesquelles les femmes se déplaçaient d'une communauté à l'autre, ouvrant la porte à des explications bien plus compliquées que les simples.
07/07/2026 sciencedaily-fossils ⚙ Traduction automatique
Le mystère de l’effondrement de Maya s’approfondit alors que les scientifiques ne trouvent aucune sécheresse sur un site clé
migration Guatemala
Après tout, le mystérieux effondrement de la civilisation maya n’a peut-être pas été provoqué uniquement par la sécheresse. De nouvelles preuves provenant des sédiments lacustres du Guatemala révèlent qu'une ville clé, Itzan, a bénéficié d'un climat stable même si sa population a brusquement disparu. Au lieu d’un effondrement environnemental, les résultats suggèrent quelque chose de plus complexe : un réseau de villes étroitement interconnectées qui s’effondre sous la pression. Alors que la sécheresse frappait les régions voisines, les guerres, les migrations et l'effondrement économique se répercutaient probablement au-delà des frontières.
28/04/2026 sciencedaily-fossils ⚙ Traduction automatique
Les humains ont atteint l’Australie il y a 60 000 ans, révèle une nouvelle étude ADN
ADN migration Australie Guinée étude
Les scientifiques ont découvert des preuves irréfutables selon lesquelles les humains ont atteint la Nouvelle-Guinée et l’Australie il y a environ 60 000 ans, soit plus tôt que ne le suggèrent certaines théories récentes. En retraçant les lignées d’ADN maternel, l’équipe a découvert que ces premiers voyageurs utilisaient probablement au moins deux routes migratoires différentes à travers l’Asie du Sud-Est. Cela témoigne de compétences sophistiquées en matière de navigation et de navigation bien plus tôt qu’on ne le pensait. La recherche aide à clarifier un mystère de longue date sur la façon dont les humains se sont propagés à travers le monde.
09/04/2026 sciencedaily-fossils ⚙ Traduction automatique
Un visage fossile vieux de 1,5 million d’années oblige à repenser les origines humaines
dent migration Éthiopie fossile découverte origine humaine
Des scientifiques ont reconstruit numériquement le visage d'un fossile d'Homo erectus vieux de 1,5 million d'années provenant d'Éthiopie, révélant ainsi une apparence étonnamment primitive. Bien que son boîtier crânien corresponde à celui de l'Homo erectus classique, le visage et les dents ressemblent à des ancêtres humains beaucoup plus anciens. Cette découverte remet en question les idées reçues de longue date sur le lieu et la manière dont Homo erectus a évolué. Cela fait également allusion à un réseau complexe de migrations et à un possible mélange entre les premières espèces humaines.
16/12/2025 sciencedaily ⚙ Traduction automatique
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