Ordovician
Ostracoderms
Ordovician
Rugosan corals
Ordovician
Eurypterids or sea scorpions
Ordovician
Major radiation of trilobites and brachiopods
Silurian
First land animals
Silurian
Placoderms
Silurian
Appearance of first higher plant, Cooksonia
Cooksonia
Devonian
First insects (both winged and wingless
species)
Devonian
First trees and first forests
Devonian
First sharks
Ray-finned fish
Coelacanths Coelacanth distribution
Lungfishes
Acanthostega - early amphibian Devonian
First land amphibians (Ichthyostega)
Carboniferous
Dragonflies with 70 cm wing spans
Millipedes over 2 m long
Anthracosaurs
Carboniferous
First reptiles (amniotic egg)
Permian mass extinction
Trilobites
Rugosan
corals
Cotylosaur
Stem Reptiles
Therapsida
Mammal-like Reptiles
ThecodontiaPterosauria
Hadrosaurs (ornithopods)Sauropods
Fig. 20.03Theropod dinosaur
Deinonychus (theropod)Plesiosaurs
Ichthyosaurs Icthyosaurs
Fig. 20.04b Fig. 20.06