Coba jelasin Rujukan dari Laurentia dalam bahasa melayu dong

Paleogeography of the Southwestern US , paleogeographic history of southwestern Laurentia, goes back to 1.7 billion years ago.

Mesozoic Paleogeography and Tectonic History, Western North America  – Paleogeographic history of western Laurentia, goes back to the Permian period.

USGS Interior Plains Region web site

The Dynamic Earth, United Plates of America from The Smithsonian National Museum of Natural History