Geologists have long struggled to understand massive time gaps in Earth’s rock record, where millions—sometimes billions—of ...

Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life. Many different representations of the timeline have been created, and many approaches ...

It has therefore become possible that, by means of changes which are known to have occurred in a given number of years, some measurement of the time represented by the whole series of geological ...

set out to show that rocks were time clocks -- that serious scientific interest in geological age began. Before then, the Bible had provided the only estimate for the age of the world: about 6,000 ...

"When magnetite is oxidized, the geologic clock is reset, so to speak ... their forensic tool can be applied throughout geologic time to investigate weathering, alternation and erosion of ...

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 stretch of geologic history is commonly referred to as "deep time," and it's a concept perhaps as difficult to conceive as deep space. Can humans measure deep time? Yes. Will we ever truly ...

An Index fossil is any animal or plant preserved 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 index fossils and ...