Phanerozoic

The Phanerozoic Eon represents the current segment of Earth's history, spanning from roughly 541 million years ago to the present day. Derived from the Greek words meaning "visible life," this eon is defined by the rapid proliferation, diversification, and preservation of complex multicellular organisms with hard shells and skeletons. It stands in stark contrast to the preceding billions of years of micro-organism dominance. The Phanerozoic is split into three major geological eras: the Paleozoic, Mesozoic, and Cenozoic. Throughout this eon, life expanded from marine environments to colonize land, paving the way for massive forests, insects, amphibians, reptiles, and mammals. It is also marked by dramatic tectonic movements, including the assembly and breakup of the supercontinent Pangea, alongside major mass extinction events that repeatedly reshaped the evolutionary trajectory of global biodiversity.