Unit 7 Geologic Time--Earth Science VA

Which layer is the youngest?

Fossils are found in which type of rock?

A fault or intrusion must be younger than the layer it crosses is which principle?

 Approximately how much of Earth's history is represented by Precambrian time

During which period did reptiles evolve?

Of the following, which is the smallest unit of time on the Geologic Time Scale?

If 25% of parent nuclei is remaining, how old is the sample?

During which time did bacteria evolve?

Given in years, how old is Earth?

A fossil found in which layer would be the oldest?

During which era were trilobites abundant?

Which of the following give you an accurate numeric date of an event or fossil?

The time it takes for 50% of the parent nuclei to decay into a daughter nuclei is called

<p>When did humans evolve?</p>

What type of remains is seen here?

 Which samples can be dated with Carbon-14

Which event occured first?

Which event is the most recent?

This term means "ancient life"

Which of the following is NOT required for an index fossil to be useful?