13 Chapter 13 Earth’s History. Precambrian History 13.1 Precambrian Time 4.56 billion years ago until the start of the Cambrian period, over 4 billion.
The Geologic Time Scale Earth’s History. The geologic time scale divides Earth’s long history into units of time… Eras Periods Epochs Eras are divided.
GEOLOGIC TIME 8-2.5. Make sure you know…….. The geologic time scale is a record of the major events and diversity of life forms present in Earth’s history.
Geologic Time Scale. Mesozoic Era 13.3 Mesozoic Era: Age of Reptiles Dinosaurs were land-dwelling reptiles that thrived during the Mesozoic era. Mesozoic.
