At the terminus of the Devonian, Earth rapidly cooled into an icehouse, marking the beginning of the Late Palaeozoic Ice Age. Fig-ure 1 shows two peaks of origination sug- . Sea levels were high with much of western North America under water. About 20% of all animal families and three-quarters of all . The first tetrapods appeared in the fossil record in the ensuing Famennian subdivision, the beginning and end of which are marked with extinction events. Manticocerassp. This extinct group of armored fish is represented by fossil skin fromCoccosteussp. Lystrosaurus was one of the few terrestial species that survived the permian extinction. The new forests, dominated by the first trees, created a new biosphere and altered global carbon cycling. [57] Together, these are considered one of the "Big Five" mass extinctions in Earth's history. Only the event occurring at 375 million years ago is large enough to be considered part of the Big 5. slow start ofconodonts in the Cambrian. This allowed sharks to dominate, giving rise to a whole variety of shapes and forms. [27][28], Sea levels were high worldwide, and much of the land lay under shallow seas, where tropical reef organisms lived. What era is the Silurian period in? right viewDunkleosteouslife reconstruction, Mollusks (ToL: Mollusca
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