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, ...

Prehistoric time line, geologic time scale ... The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates, amphibians, and reptiles. Dinosaurs ruled the Earth in the mighty ...

Soviet scientists embarked on an ambitious quest to dig into the Earth's crust, creating the world-renowned Kola Superdeep ...

Then around 700 million years ago during Snowball Earth—a geologic era when glaciers may have stretched as far as the Equator ...

There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil?" First, the relative age of a fossil can be determined.

The Stratigraphy and Paleontology Hall displays in chronological order a collection of fossils representing each of the geological eras beginning from the late Precambrian period in China.

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 ...