translate English to French: By 460 million years ago, North America and Europe were pressing together, raising the Appalachian Mountains and closing the Iapetus Sea. Some blocks of oceanic crust and mantle were transported west and raised to the surface of the earth.
Bien plus tard, les glaciers ont remodelé la région, créant des fjords et effectuant des coupes transversales dans les montagnes qui ont révélé leur passé géologique.