most ancient continent, which was formed 3.6 billion years ago, was named Vaalbara.After its collapse has not occurred again and again broke new supercontinent: Ur Kenorland, Nuna, Rodinia, Pannotia.After the collapse of Pannotia dokebriyskogo at the end of the period there was a continent of Gondwana, as well as several mini-continent - Baltica, Siberia and Lawrence.

Laurentia corresponded to the ancient North American platform, which became the basis for the future of the continent of North America.
During the Caledonian orogeny (500-400 million years ago) Lawrence faces another ancient platforms - Eastern Europe.Thus was born the continent Euramerica.At the end of the Paleozoic, in the Permian period, a new supercontinent - Pangaea.Like other ancient continent, Euramerica part of the Pangea.In the form
ation of the supercontinent at the junction of mountain systems platforms emerged, many of which exist at present.In North America, a number of these ancient mountains belong to the Appalachian Mountains.

breakup of Pangea falls on Mesozoic - more precisely, to the Jurassic period (201,3-145 million years ago).Supercontinent was split into two continents - Gondwana and Laurasia.As part of Laurasia was also an ancient Euramerica, including Lawrence - North American ancient platforms.

Laurasia was situated in the northern hemisphere and joins, along with the future of North America, almost all of the territory that are in this hemisphere at the moment, the only exception is the Indian subcontinent.For this reason, the ancient continent, and got its name is a combination of the terms "Eurasia" and "Lawrence."From the south of the continent - Gondwana Laurasia was separated Tethys Ocean, expanding to the east and the west of tapering.

Decay Laurasia starts in the middle of the Mesozoic period.Ancient Euramerica without retains its shape: the East-European platform is part of the new continent - Eurasia, from Lawrence North American platform, formed by North America.

Laurasia After the collapse of North America and Eurasia have repeatedly joined together Bering isthmus, occurs on the site of the modern Bering Strait.These changes were associated with fluctuations in the level of the oceans when the sea level fell, over the surface of the sea turned out to be a very extensive area of ​​the continental shelf, the width of which reached 2,000 km.The existence of the Bering isthmus allowed early humans to move from Asia to North America, so there was the indigenous people of this continent - the Indians.

Last Bering land bridge disappeared 10-11 thousand years ago, and it was the "finishing touch" to the formation of the modern contours of North America.