The Geological Era Mesozoic

The Palaeozoic

The earth Late Permian

(Souce map: © C.R.Scotese, www.scotese.com)

The earth Late Cambrian

(Souce map: © C.R.Scotese, www.scotese.com)

Survey Palaeozoic

At the end of Late Permian there's a mass extinction, probably based on massive climatic changes (poles glaciation). The extinction includes 90% of marine species (invertebrates, vertebrates; 100% of Trilobita) as well as a great number of amphibian and reptiles. Terrestrial flora isn't affected.

Reptiles and amphibious living carapace batrachians are the predominat vertebrates.

Dispersion of the Carboniferous swamp forrests.

Among insects, partially featuring giant sizes, the evolution of the first reptiles begins.

The marine medium is dominated by invertebrates and fishes. Among the elder Ostracodermata  particularly the  Chondrichthyes (sharks and  rajiformes) and Teleosts practiced an evolutionary expansion.

Evolution of the first terrestrial plants.

Evolution of the first fishes.

Marine invertebrates dominating the oceans among Brachiopoda and mussels. The diversity of trilobites peaks out.

There's solely marin life. At the beginning of Cambrian the trilobites,  partially very primitive evolved, are representing index fossils, significant to this System. They are sharing their marin habitat with cephalopods, snails, mussels, graphtolites, sponges and coralls.

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