The Paleozoic Era (539–252 Ma) is in the Phanerozoic Eon, occurring after the Neoproterozoic Era, and before the Mesozoic Era. It is a time for great plant innovation and evolution. During this time land plants evolve and emerge from water, begin as lowly moss-sized plants, and become towering trees by the end of the Devonian Period. Every major group of plants evolves during this time: mosses, liverworts, hornworts, clubmosses, ferns, horsetails, and seed plants. It is a time when plants evolve structures that are commonplace today: branching stems, roots, leaves, wood, and seeds.
538.8±0.2 Ma–252 Ma million years ago
Permian: 299–252 Ma
Carboniferous: 359–299 Ma
Devonian: 419–359 Ma
Silurian: 444–419 Ma
Ordovician: 485–444 Ma
Cambrian: 539–485 Ma
7% of geologic history; 53% of Phanerozoic
Diversification of eukaryotic life
Rise and diversification of algae, plants, and fungi
Macro-algae diversify
Parasitic, saprophytic fungi
Land plants originate:
Origin of vascular tissue, leaves, roots, wood, and seeds
The rapid diversification of animal phyla
Invertebrates: sponges, mollusks, worms, crustaceans
Chordates: fishes, amphibians, reptiles