Geologic Time Scale

How many eras are there between Precambrian Time and present time?

Scientists chose where units of geologic time began and ended based on?

Which prefix means ancient?

The Triassic, Jurassic and Cretaceous Periods are in what Era?

Where do the names of Geological periods come from?

A record of the geologic events and the evolution of life forms is called?

Studying rock layers and index fossils was what step in developing the geological time scale?

The longest span of time is in which era?

What is the correct order oldest to modern? 1. Mesozoic 2. Precambrian 3. Cenozoic 4. Paleozoic

____ are subdivided into units of geological time called _______.