Geological Time Scale

Front

What is the Geological Time Scale?

Back

A system used by geologists to describe the timing and relationships of events in Earth's history.

Front

What era did dinosaurs, small mammals, and birds exist in?

Back

Mesozoic Era.

Front

What does the Law of Superposition state?

Back

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

Front

Which fossil is considered the youngest?

Back

The fossil that is found in the highest rock layer.

Front

When did jellyfish first appear on Earth?

Back

During the Precambrian Time.

Front

What is Stratigraphy?

Back

A branch of geology that studies the arrangement of sedimentary rock layers.

Front

What is the significance of the Precambrian Time?

Back

It is the earliest part of Earth's history, covering about 88% of geological time.

Front

What major event marks the end of the Mesozoic Era?

Back

The mass extinction event that wiped out the dinosaurs.

Front

What is a fossil?

Back

The preserved remains or traces of ancient organisms.

Front

What is the difference between the Paleozoic and Mesozoic Eras?

Back

The Paleozoic Era is known for the development of early life forms, while the Mesozoic Era is known as the age of reptiles.