Arctica
Arctica is in Earth's history, a hypothetical continent that could have existed between 1.8 and 1.5 billion years ago on the border of Paleoproterozoic to Mesoproterozoikum. It consisted of parts of North America and the central parts of Siberia.
Naming
The name Arctica was proposed in 1996 by John JW Rogers. He chose the name Arctica because opened through to a much later period, the Arctic Ocean by this hypothetical continent.
Components
Arctica includes the cratons of the Canadian Shield, the Wyoming craton and the two cratons, constituting the Siberian plate, the Aldan craton and the Anabar / Angara craton. However, the arrangement or position Sibirias relative to the Canadian Shield is very uncertain.
Arctica as a geological continent
Arctica was formed about 2.5 billion years or interval 1,8 billion to 1.5 billion years. Arctica could thus have originated from the still older Kenorland by accretion of the Wyoming craton and the two Siberian cratons and the Rae and Nain complexes in Greenland. To 1.8 billion years Arctica and Baltica was fused into a continent that was named Nena.