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Ceratopsida dinosauriers migrationsmönster under krittiden baserat på paleobiogeografi och fylogeni

På svenska

Author

  • Lydia Rönning

Summary, in Swedish

The infraorder Ceratopsia, or horned dinosaurs, within the clade Dinosauria, shows a specific, restrained migratory pattern. Therefore, the classical view presented by Sereno (1999), of a monodirectal migratory event from Asia to North America via the Bering’s Strait has been commonly accepted in its simplicity. Another hypothe-sis presented during the same time by Chinnery (1998) suggests a migration route from Asia to North America through prehistoric Europe; however, this scenario has largely been rejected due to its bold nature. In order to evaluate the different hypophysis, this study analyses publications dealing with the phylogeny and paleobiogeo-graphy of horned dinosaurs. Yet, problems in mapping the migratory patterns are many: Firstly, several findings that contradict the classical picture have been overlooked. Further, there is a fossil underrepresentation during critical periods and from critical places. Lastly, there are disagreements among scientists, both concerning the relat-ionships within Ceratopsia and in reconstructing the paleogeography of the Cretaceous Period. What can be said at the moment is that the migrations of horned dinosaurs were more complex than the classical idea proposes. The migrations probably were more global, had more routes, more directions, and happened at more stages than have hitherto been assumed.

Publishing year

2017

Language

Swedish

Publication/Series

Examensarbeten i geologi vid Lunds universitet

Document type

Student publication for Bachelor's degree

Topic

  • Earth and Environmental Sciences

Keywords

  • Ceratopsia
  • Cretaceous
  • Migration
  • Beringia
  • Paleobiogeography

Report number

510

Supervisor

  • Johan Lindgren