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, ...

As a period of geologic time, the boundaries of the Triassic are defined on the basis of rocks and the fossil record. It was the German geologist Friedrich August von Alberti who first marked the ...

The Triassic is a tale of two histories. One is its natural history, begun after the Great Permian Dying, 252m years ago, when, as happens from time to time, plate tectonics brought Earth’s continents ...

To be considered active, a volcano must have erupted at some point during the Holocene, but dormant and extinct are a little ...

Time is fundamental to Earth science. Geochronology data are essential for determining the timing, duration, and rates of Earth processes and events, and are increasingly required to perform modern, ...

The cold periods - or ice ages - are times when the ... ago), ice ages have occurred at widely spaced intervals of geologic time - approximately 200 million years - lasting for millions, or ...

The trilobites were such a well-adapted species that they were able to survive several geological time periods. Those time periods include: Geological Time Period Years Of Geological Time Period ...

One way we can understand the effect of climate change is to look at the geological past - millions of years ago - and the fossil record, to see what happened to organisms during periods of time in ...

Periods that the model suggests may have had ... Tectonic activity is a major determinant of Earth's atmospheric composition ...

A Timescale is a scale used to represent periods of time. Option ... in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. We will look at a few ...