Fossils, Relative & Absolute Age, Geologic Time Scale

Front

What are the units on the geologic time scale that Eras are divided into?

Back

Periods

Front

The principle that states that geologic processes that occur today are similar to those that have occurred in the past is called:

Back

Uniformitarianism

Front

What are the units on the geologic time scale that Eons are divided into?

Back

Eras

Front

What organisms thrived during the Mesozoic era?

Back

Reptiles

Front

In order for a fossil to form, what usually has to happen?

Back

It has to be buried

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of ancient organisms.

Front

What is the geologic time scale?

Back

The geologic time scale is a system of chronological dating that relates geological strata to time.

Front

What is the Law of Superposition?

Back

The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What is an Eon?

Back

An Eon is the largest division of geological time, lasting hundreds of millions to billions of years.

Front

What is an Epoch?

Back

An Epoch is a subdivision of a Period on the geologic time scale.