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# Evolution ## Evolution of Plants * Azoic Era (4600 million years ago) - Era of no life. * Archaeozoic Era (3500 million years ago) - Era of invisible life. Era with only prokaryotes. Some organisms produced oxygen. * Proterozoic Era (3000-1000 million years ago) - Era of early life. Era with euka...

# Evolution ## Evolution of Plants * Azoic Era (4600 million years ago) - Era of no life. * Archaeozoic Era (3500 million years ago) - Era of invisible life. Era with only prokaryotes. Some organisms produced oxygen. * Proterozoic Era (3000-1000 million years ago) - Era of early life. Era with eukaryotes. * Palaeozoic Era (570-280 million years ago) - Era of ancient life. * Cambrian (570 million years ago) - Age of trilobites. * Ordovician (500 million years ago) - Age of invertebrates. Also known as "Age of giant molluscs." ## A sketch of the evolution of plants ### **Palaeozoic** 1. Silurian 2. Devonian 3. Carboniferous 4. Permian 5. Triassic 6. Jurassic 7. Cretaceous ### **Mesozoic** * **Bryophytes** * **Arborescent lycopods (ferns)** * **Herbaceous lycopods (ferns)** * **Sphenopsids (horsetails)** ### **Cenozoic** * **Gymnosperm** * **Seed ferns (primitive gymnosperms)** * **Progymnosperms** * **Psilophyton** * **Rynia-type plants** * **Zosterophyllim (primitive pterydophytes)** * **Tracheophyte ancestors** * **Chlorophyte ancestors** * **Angiosperms** * **Cycads** * **Conifers** * **Gnetales** * **Ginkgos** * **Dicotyledons** * **Monocotyledons** * **Pterydophytes (ancestors of vascular plants)**