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This Concept Map has information related to: Chapter 20 - Kelsey E, Cambrian Explosion which lasted from 565 mya to 525 mya, Paleozoic Era which began 543 mya, Cenozoic Era age of Mammals, birds, insects, and flowering plants, Chaper 20 includes Fossils, Mesozoic Era breaks into periods Jurassic, Paleozoic Era breaks into periods Carboniferous, Quaternary breaks into epochs Holocene, Paleozoic Era breaks into periods Ordovician, Paleozoic Era breaks into periods Cambrian, Chaper 20 includes Timeline