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 ...

“When you start naming geologic-time terms, you need to define what exactly the boundary is, where it appears in the rock strata,” says Whitney Autin, a stratigrapher at the SUNY College of ...

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 ...

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, ...

This geological signature consists of ... This is why the K-Pg boundary is so important. It marks the time when this cataclysmic event occurred, when the age of reptiles (dinosaurs) ended, and ...

Thus these different phenomena were different aspects of the forces Lyell believed had operated over geological time to produce the world we see now. "The present is the key to the past," was the ...

Modern continental rocks carry chemical signatures from the very start of our planet's history, challenging current theories about plate tectonics.

Using a unique field site in the Negev, Ben-Gurion University of the Negev geologists have presented the first-ever time-dependent ... divides—the topographic boundaries separating neighboring ...