Unconformities #2

What is an unconformity?

• A gap in the fossil record.

• A gap in the rock record.

How much of Earth's history is missing in the Great Unconformity?

• 10%

• 25%

A stratum is a layer of rock that is distinct from the layers above and below it.

• True

• False

A rock sequence is made up of multiple layers of rock that have built up over time.

• True

• False

We are currently in the...

• Proterozoic Eon

• Phanerozoic Eon

The Proterozoic Eon is known for multiple supercontinents that broke up.

• True

• False

The Snowball Earth Theory states that at one time Earth was covered in glaciers from the poles to the Equator.

• True

• False

One possible cause of the Great Unconformity is

• Large scale erosion.

• Extreme volcanism

One theory on Snowball Earth is that carbon (a contributor to the greenhouse effect) was captured in the ocean, leading to less carbon in the atmosphere, which contributed to global cooling.

• True

• False

One theory for the cause of the Great Unconformity is that extreme glaciation would have caused widespread erosion.

• True

• False