Fossils and Relative Dating

Front

What is an index fossil?

Back

An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale. It is typically widespread, abundant, and has a short geological lifespan.

Front

What are the two main traits of a good index fossil?

Back

A good index fossil is widespread geographically and has a short lifespan.

Front

Why are trilobites considered good index fossils?

Back

Trilobites are considered good index fossils because they lived in large populations and were widespread during the Paleozoic era.

Front

What is amber?

Back

Amber is hardened tree sap that can preserve original remains of organisms.

Front

In what conditions are mammoths typically preserved?

Back

Most mammoths were preserved in ice, which helped to keep their remains intact.

Front

What characteristic is least important for a fossil to be a good index fossil?

Back

Large size is the least important characteristic for a fossil to be considered a good index fossil.

Front

What is relative dating in geology?

Back

Relative dating is a method used to determine the age of rocks and fossils in relation to one another, without determining their exact age.

Front

What is the significance of the Cenozoic era?

Back

The Cenozoic era is significant because it is the most recent geological era, marked by the dominance of mammals and birds.

Front

What does it mean for a fossil to have a 'short lifespan'?

Back

A fossil with a 'short lifespan' means that the organism existed for a limited period of time, making it useful for dating rock layers.

Front

What is the role of fossils in understanding Earth's history?

Back

Fossils provide evidence of past life forms and environments, helping scientists understand the history of life on Earth.