Temagami Greenstone Belt was south of Laurenta, Siberia was just south of the equator east of Laurenta, and Gondwana lied mostly in the Southern Hemisphere. Subsequently, Baltica, Laurenta and microcontinent Avalonia collided in the Devonian period (416-359 million years ago) to form minor supercontinent Euramerica. This eventually started to collide with Gondwana and other landmasses to form supercontinent Pangaea 255 million years ago. In the Late Triassic period some 152 million years ago, Pangaea split into two minor supercontinents, namely Gondwana and Laurasia. The TGB represented a minor portion of western Laurasia until it divided into Eurasia and North America about 94 million
Gondwana Late Triassic and became important in the Jurassic and Cretaceous. It is possible that gymnosperm biodiversity surpassed later angiosperm biodiversity and that the evolution of angiosperms began during the Triassic but, if so, in Laurasia rather than in Gondwana. Two Gondwanan classes, lycophytes and sphenophytes, saw a gradual decline during the Triassic while ferns, though never dominant, managed to diversify. The brief period of ice house conditions during the Triassic–Jurassic extinction event had a dramatic impact on dinosaurs but left plants largely unaffected. The Jurassic was mostly one of hot house conditions and, while vertebrates managed to diversify in this