Timelines are often used in history textbooks and biographies -- they explain what happened during a certain period of time or to a particular person, starting with the earliest event and moving forward through time. The below Geologic timeline illustrates the evolution of humankind and other animals. As the graphic depicts, the Earth had formed an estimated 4540 million years ago. Earth’s crust had then cooled enough around 4000 million years ago, allowing continents and life to form. The below infographics then explains the Paleozoic era and how the first reptiles came into being—followed by the Mesozoic era and the rise and fall of Dinosaurs that ultimately lead to the Cenozoic era where the first mammals surfaced on the Earth’s land. Instead of using complex software that requires you to pay a hefty sum, you can use the free timeline maker EdrawMax that provides you 100% customizable free templates. After your editing, you can share these timeline diagrams in PNG, JPG, or PDG, or any other format deemed required from your side.