Geologic Time (Graded)

What is the longest unit of time?

• Eon

• Era

• Period

• Epoch

Each era is divided into

• Periods

• Eons

• Epochs

• eras

Each period is divided into

• an epoch

• an eon

• a period

• an era

A record of the geologic events and life forms in Earth's history.

• index fossil
• half-life
• radioactive dating
• geologic time scale

Change over time for organisms.

• geologic time scale
• evolution
• era
• period

What Era are we currently in?

• Paleozoic

• Mesozoic

• Cenozoic

• Triassic

Which Era was dominated by dinosaurs?

• Paleozoic

• Mesozoic

• Cenozoic

• Cambrian

What type of event usually marks the end of an Era

• A Mass Extinction

• A Quinceanera

• An earthquake

• Evolution of a species

Which era began with the early invertebrates, such as trilobites and brachiopods.

• Paleozoic

• Mesozoic

• Cenozoic

early vertebrate fish began to develop in the

• Paleozoic era

• Mesozoic era

• Cenozoic era