Geologic Time Scale

Which period are we currently in?

• Quaternary
• Holocene
• Jurassic
• Tertiary

Which layer is the oldest and youngest?

• C and B
• C and E
• D and E
• A and B

Which era is the longest?

• Cenozoic
• Cambrian
• Precambrian
• Phanerozoic

Which layer is a result of an igneous intrusion?

• B
• C
• D
• E

The geologic time scale is a record of....

• the history of fossils only
• the history of rocks
• the history of rock layers and fossils
• geologist notes

Paleontologists infer that the earth is approximately how many years old?

• 4.5 million years
• 450 million years
• 450 billion years
• 4.5 billion years

Which of the following correctly lists the layers of rock in order from youngest to oldest?

• A, B, C, D, E
• B, C, D, E, A
• E, D, A, B, C
• C, B, A, D, E

The Mesozoic Era was the Age of Reptiles, and the current Cenozoic Era is the Age of

• Birds
• Ice
• Mammals
• Humans

The _________ was an era dominated by the dinosaurs

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

Which of the following is used by geologists to determine the relative ages in a rock sequence?

• stratigraphy
• fossils
• cross-cutting relationships
• all of these