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 ...

Sharks have ruled the Earth’s oceans for 400 million years and recent research on fossilized shark teeth has led to the discovery of an innovative method for dating ancient sediments.

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 ...

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 ...

has shown that the strontium isotopic compositions of island arc magmas have varied in tandem with seawater strontium composition over geologic time. Specifically, the study proposes a model for ...

Fossil Seawater: Ancient seawater that has been trapped in sedimentary formations and altered over time, often found in deep geological layers. Diagenesis: The physical and chemical changes ...

Japanese researchers hope that a new geologic epoch covering the present ... The ocean bed is covered by a body of seawater containing no oxygen, allowing it to be inhabited by few organisms.