During the Carboniferous–Permian Siberia, Kazakhstan, and Baltica collided in the Uralian orogeny to form Laurasia.

The Palaezoic-Mesozoic transition was marked by the reorganisation of Earth's tectonic plates which resulted in the assembly of Pangaea, and eventually its break-up.
 Caused by the detachment of subducted mantle slabs, this reorganisation resulted in rising mantle plumes that produced large igneous provinces when they reached the crust.
 This tectonic activity also resulted in the Permian–Triassic extinction event.
 Tentional stresses across Eurasia developed into a large system of rift basins (Urengoy, East Uralian-Turgay and Khudosey) and floodbasalts in the West Siberian Basin, the Pechora Basin, and South China.

Laurasia and Gondwana were equal in size but had distinct geological histories.
 Gondwana was assembled before the formation of Pangaea, but the assembly of Laurasia occurred during and after the formation of the supercontinent.
 These differences resulted in different patterns of basin formation and transport of sediments.
 East Antarctica was the highest ground within Pangaea and produced sediments that were transported across eastern Gondwana but never reached Laurasia.
 During the Palaeozoic, c. 30–40% of the Laurasia but only 10–20% of Gondwana was covered by shallow marine water.
During the Carboniferous–Permian Siberia, Kazakhstan, and Baltica collided in the Uralian orogeny to form Laurasia.
The Palaezoic-Mesozoic transition was marked by the reorganisation of Earth's tectonic plates which resulted in the assembly of Pangaea, and eventually its break-up.  Caused by the detachment of subducted mantle slabs, this reorganisation resulted in rising mantle plumes that produced large igneous provinces when they reached the crust.  This tectonic activity also resulted in the Permian–Triassic extinction event.  Tentional stresses across Eurasia developed into a large system of rift basins (Urengoy, East Uralian-Turgay and Khudosey) and floodbasalts in the West Siberian Basin, the Pechora Basin, and South China.
Laurasia and Gondwana were equal in size but had distinct geological histories.  Gondwana was assembled before the formation of Pangaea, but the assembly of Laurasia occurred during and after the formation of the supercontinent.  These differences resulted in different patterns of basin formation and transport of sediments.  East Antarctica was the highest ground within Pangaea and produced sediments that were transported across eastern Gondwana but never reached Laurasia.  During the Palaeozoic, c. 30–40% of the Laurasia but only 10–20% of Gondwana was covered by shallow marine water.
Laurasia