2. DEFINITION
The first geological time scale was proposed in 1913 by the British geologist
Arthur Holmes (1890-1965).
This was soon after the discovery of the radioactivity and using it Holmes
estimated that the earth was about 4 billion years old (evidence from
radioactive dating indicates that earth is about 4.6 billion years old).
The geological time scale is a system of chronological measurement that related
stratigraphy (the study of rock strata) to time.
It is used by the geologists, paleontologists and other scientists to describe the
time and relationship between the events that have occurred throughout earth’s
history.
