We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

To ease this task, experts have divided earth’s history into pieces of time, called aeons, eras, periods, and epochs. These divisions in Earth’s geological timescale demarcate key geologic ...

Earth's 4.5 billion year geological history is full of death and rebirth, mass extinctions and explosions of biodiversity, with different periods often marked by cataclysmic changes that radically ...

The strength of Earth’s magnetic field and the amount of oxygen in its atmosphere seem to be correlated—and scientists want ...

Dating to the Cretaceous period, the geological era between 145.5 and 66 million years ago, the sedimentary rocks far underneath East Texas and Louisiana contain significant undiscovered energy ...

The idea that we are now living in the Anthropocene – a new geological epoch characterised ... for the Anthropocene is during the Romantic period (1780-1830), which saw the beginning of the ...

The geologic time scale provides the official framework for our understanding of Earth’s 4.5 billion-year history. Geologists break down our planet’s history into eons, eras, periods ...

Geological eras and periods with relative times (Myr ago) are indicated on the left. Mammal lineages are in red; diapsid reptiles, shown as archosaurs (birds, crocodilians and dinosaurs), are in ...