Fossil Image
Which layer at site 1 is the oldest?
Layer A
A variety of different living things in a fossil layer or habitat
Diversity
What is a fossil?
The remains of a plant or animal that lived long ago
Using both sites, which organism evolved most recently - birds or mammals?
Mammals
The disappearance of all living members of a species
Extinction
Paleontologist
Which TWO layers show the LEAST diversity?
Layers D and A
A method to determine if one rock layer is older or younger than another layer
Relative dating
What kind of fossil dating is more accurate - relative dating or absolute dating?
Absolute dating
How did the environment/ habitat change at site 1 between layers A/B and layer D?
The environment changed from a water environment to a land one
Stacked up layers of sedimentary rock
Rock strata
What kind of rock do fossils form in?
Sedimentary rock
The boundary between layer A and Layer B can be dated to be about 251 million years ago using radiometric dating. About how long ago did trilobites go extinct?
251 million years ago
A representation of Earth's history based on the rock record
Geologic time scale
Below the ice in the arctic are rocks with fossils. Many of them are the fossils of tropical plants like palm trees. What does that tell us about what the climate in the arctic used to be?