Defining Geological Time
Geological time is categorized into eons, eras, periods, epochs, and ages. This framework helps scientists understand Earth's history and the evolution of life over billions of years.
Precambrian: Time's Dawn
The Precambrian spans from Earth's formation to 541 million years ago. Comprising 88% of Earth's history, it's split into the Hadean, Archean, and Proterozoic eons.
Phanerozoic Eon Breakdown
The Phanerozoic Eon, starting 541 million years ago, is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. It's marked by life's proliferation and diversification.
Cenozoic's Modern Epochs
The Cenozoic Era, 'Age of Mammals', has epochs like the Paleogene, Neogene, and Quaternary. The current epoch, the Holocene, started 11,700 years ago, following the last Ice Age.
Epochs' Finer Divisions
Epochs can be further divided into ages, which represent significant changes in Earth's flora, fauna, or climate. The Meghalayan, the current age, began 4,200 years ago due to a global drought.Fossils in Space
Scientists found fossilized algae on meteorites, suggesting life may have traveled across the universe via asteroids.
What eon covers 88% of Earth's history?
Phanerozoic
Precambrian
Cenozoic
Company