The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. . but at the beginning of the Late Ordovician, from to Ma, volcanoes. The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from to million years ago, and is subdivided into six geologic periods - million years ago. Key events in the Paleozoic. —. –. —. –. - —. –. Simplified Geologic Time Scale. Era, Period or System, Epoch or Series. Cenozoic (66 million years ago - Present) characterized by the emergence of the .
Ancient Earth ( million years ago). Late Ordovician. Life continued to flourish during the Ordovician as it did in the earlier Cambrian period. The Cambrian Radiation – million years ago. Plants move on to Land – million years ago. Animals move on to Land – million years ago. You might wish to start in the Cenozoic Era ( million years ago to the present) and Holocene (11, yrs to present); Pleistocene ( mya to 11, yrs).
Fossils records have shown that life existed for about 3, million years, but complex life begins with the start of the Cambrian period, million years ago . A quarter of a billion years ago, long before dinosaurs or mammals evolved, the This heralded a million-year ice age during which shallow, life-rich seas. Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began million years ago, following the Cambrian Period, and ended . Cambrian ( - Million Years Ago) After Earth had its fireball of event that happened million years ago may have been caused by a.