Geological Time Scale. 1. Cenozoic Era. Human develop in this period. This period is called 'Age of mammals'. Dinosaurs and many other species were extinct in this period.

Geologists divide Earth’s 4.5 billion-year history into a time scale that isn’t marked by a calendar, but by significant changes to the planet that can be seen in the geologic record.

New Astronomical Results Refine The Geological Time Scale Date: November 3, 2004 Source: Journal Astronomy & Astrophysics Summary: A team led by Jacques Laskar from the Institut de Mécanique ...

According to the International Union of Geological Sciences (IUGS), the professional organization in charge of defining Earth’s time scale, we are officially in the Holocene (“entirely recent ...

The Richter scale was developed in 1935 by American seismologist Charles Richter (1891-1989) as a way of quantifying the magnitude, or strength, of earthquakes.