Geologic Time Scale

Front

What is the Geologic Time Scale?

Back

A system of chronological dating that relates geological strata to time, used to describe the timing and relationships of events in Earth's history.

Front

What are index fossils?

Back

Fossils that are abundant, easily recognizable, short-lived, and widespread, used to identify and date the layers of rock in which they are found.

Front

What time period did dinosaurs, small mammals, and birds exist?

Back

Mesozoic Era.

Front

Which fossil is considered the best index fossil?

Back

Frog, due to its short lifespan and wide distribution.

Front

In which time period did jellyfish first appear?

Back

Precambrian.

Front

What era are we currently living in?

Back

Cenozoic Era.

Front

What is the significance of the Precambrian period?

Back

It is the earliest part of Earth's history, covering about 88% of Earth's geological time, and includes the formation of the Earth and the first simple life forms.

Front

What major events occurred during the Paleozoic Era?

Back

The emergence of fish, amphibians, and the first land plants, as well as the formation of supercontinents.

Front

What are the four main divisions of the Geologic Time Scale?

Back

Eons, Eras, Periods, and Epochs.

Front

What is the difference between relative dating and absolute dating?

Back

Relative dating determines the sequence of events, while absolute dating provides a specific age or date for an event.