Laurasia
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Laurasia was the more northern of two large landmasses that formed part of the Pangaea supercontinent from around 335 to 175 million years ago, the other being Gondwana. It separated from Gondwana 215
Laurasia (centre) and Gondwana (bottom) as part of Pangaea 200 Mya (Early Jurassic)
Rodinia 900 Mya centred on Laurentia with Baltica and Amazonia on its southern margin. View centred on 30°S,130°E.
Laurussia (left) during the closure of the Iapetus Ocean 430 Mya (middle Silurian). View centred on 0°, 60° W.
Pangaea formed during the closure of the Rheic Ocean 330 Mya (early Carboniferous). View centred on 30°S, 30°E.
Avalonia
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Avalonia was a microcontinent in the Paleozoic era. Crustal fragments of this former microcontinent are terranes in parts of the eastern coast of North America: Atlantic Canada, and parts of the East
Current extent of Avalonia highlighted in yellow
Avalonia on its journey to Baltica at 480 Ma (Early Ordovician)