The Geological Time Scale serves as a guide to the major eras and periods of the earth's history.

1. Geological Time ScaleGeological Time Scale
By Prof. Liwayway Memije-Cruz

2. Arthur HolmesArthur Holmes
 He was a British geologist
who made two major
contributions to the
understanding of geology.
He pioneered the use of
radioactive dating of
minerals and was the first
earth scientist to grasp the
mechanical and thermal
implications of mantle
convection, which led
eventually to the
acceptance of plate
tectonics.

3. How the earth looks like How the earth looks like
now?now?

4. What is GTS?What is GTS?
The geological time scale (GTS) is a system of
chronological measurement that relates stratigraphy to
time. Stratigraphy is about the geological and
archaeological layers that make up an archaeological
deposit.

5. Basis in determining GTS:Basis in determining GTS:
According to events which took place in
each period.

6. Based on the geological rock record, which
includes erosion, mountain building and
other geological events.

7. Use fossils evidences.