Laramidia was created 90 million years ago, during the late Cretaceous period, when rising seas flooded the middle of North America and split it in two. Today Laramidia is buried under the western ...

Published in Cretaceous Research, the details of Mexidracon Longimanus point to a greater diversity of ornithomimosaurs in southern Laramidia. The lone specimen of Mexidracon comes from sediment ...

It essentially cut the continent in two, separating two large land masses — Laramidia in the west and Appalachia in the east — and isolating them for around 60 million years. The seaway was a ...