Which Era has the most complex organisms?

Which Era occurred last (most recent)?

Which period is closest to present day?

What type of environment do you think was present during the Devonian Period?

What is the oldest organism on the geologic time scale?

How many years ago did the Mesozoic Era begin?

Which organisms are the most recent (closest to present day)?

How old do Paleontologists believe the Earth is?

a model scientists use to describe the timing of events and the relationships between those events in earth’s history.

What type of event usually marks the end of an Era

Scientists chose where units of geologic time began and ended based on the appearance or disappearance of life.

What are the names of ALL parts of the geologic time scale in correct order from broadest to narrowest?

The bottom layer of rock...

Dinosaur fossils are often found in layers of

A trait or change in lifestyle that helps a plant or animal survive in its environment

A plant can become a fossil.

Extinct animals may return one day.

Check the boxes that show things we can learn from fossils.

A scientist who studies fossils is called a

What can an animals fossilized teeth tell us?

All fossils come from dinosaurs

Which type of fossil is seen here?

All of the following are often related to fossil formation and discovery except

Most fossils are formed within which kind of rock?

Click to enlarge. Study this carefully. Which fossil in the oldest?

Which layer is the oldest?

Which layer is the youngest?

If fossils in layer D are 100 million years old and in layer B they are 110 million years old, how old might are the fossils in layer C? Choose the best answer.