Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two.

2018年2月13日 · Between 100 and 70 million years ago, the entire continent was divided by a shallow sea. This sea was once filled with colossal marine lizards, long-necked plesiosaurs, toothed birds, and the occasional diving Pteranodon. The sea divided the land into two smaller continents: A ppalachia in the east and Laramidia in the west. As residents of the ...

Geologists have assigned the names “Laramidia” to western North America and “Appalachia” to eastern North America during this period of Earth’s history. Paleogeographic reconstruction of the Western Interior Seaway during the Cretaceous.

This map shows the ancient western interior seaway that divided the "lost continent" of Laramidia from Appalachia, and distribution of dinosaurs found in the rich "dinosaur boneyard."

To the west of the Western Interior seaway, a tectonically and volcanically active land called Laramidia (Archibald, 1996) sourced rivers that flowed eastward to the seaway's western shoreline.

2010年9月22日 · This map shows the ancient western interior seaway that divided the "lost continent" of Laramidia from Appalachia, and distribution of dinosaurs found in the rich "dinosaur boneyard."

During most of the Late Cretaceous (100.5 to 66 million years ago) the eastern half of North America formed Appalachia (named for the Appalachian Mountains), an island land mass separated from Laramidia to the west by the Western Interior Seaway.

Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two.

2013年11月6日 · Tyrannosauridae, a clade of large-bodied theropod dinosaurs restricted to the Late Cretaceous of Laramidia and Asia, represents an ideal group for investigating Laramidian patterns of evolution.

Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the Western Interior Seaway.