In this website you will find out how SWAG the geologic time scale is. It is so SWAG it keeps track of everything in the world from life forms to the change in the land of continental drift. The GTS is made up of four Eras: Precambrian time, Paleozoic Era, Mesozoic Era and the time period we are in right now the Cenozoic Era. These Eras are made up of Periods like in the Cenozoic Era is made up of the Tertiary and the Quaternary. This SWAG time scale was made by studying rock layers and index fossils all around the world. They came up with the Eras by finding major changes in animal and plant life. Eras depend on change in time, like when a mass extinction happens the major animals in that Era die out and gives room for the tiny animals to take charge.
COOL FACTS:
COOL FACTS:
- Cambrian in roman means whales
- As earth grew its gravity increased
- Scientists found the age of Earth by radioactive dating