Law of Superposition

Front

What does the Law of Superposition state?

Back

In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

Front

What is the purpose of the Law of Superposition?

Back

To determine the relative ages of rock layers and the fossils within them.

Front

What is relative age?

Back

The age of a rock or fossil in comparison to other rocks or fossils, rather than in years.

Front

What is absolute age?

Back

The actual age of a rock or fossil, usually determined by radiometric dating.

Front

Which rock layer is likely to contain the oldest fossils?

Back

The bottom layer of a sequence of undisturbed sedimentary rock.

Front

What type of organisms are typically found in the oldest rock layers?

Back

Simple, early life forms such as trilobites.

Front

How can scientists determine the relative age of rock layers?

Back

By using the Law of Superposition and examining the sequence of layers.

Front

What is a fossil?

Back

The preserved remains or traces of ancient organisms.

Front

What is the significance of fossils in geology?

Back

Fossils help scientists understand the history of life and the age of rock layers.

Front

What is an example of a fossil that is considered relatively old?

Back

Trilobite.