Geological Time ScaleGeological Time Scale

By Prof. Liwayway Memije-Cruz

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.

How the earth looks like How the earth looks like now?now?

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. 

Basis in determining GTS:Basis in determining GTS:According to events which took place in

each period.

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

Use fossils evidences.