Geologic Time Scale Quiz

What is the primary basis for establishing the geologic time scale?

• Observations of stratigraphy

• The number of years in each division

• The color of rock layers

• The size of fossils found

Which of the following is the largest division in the geologic time scale?

• Era

• Period

• Epoch

• Eon

How are periods within the geologic time scale typically characterized?

• By the color of the rock layers

• By the type of creatures or rocks prevalent

• By the number of years they last

• By the size of the fossils found

Why are there fewer divisions in the Precambrian era?

• It was not significant in Earth's history

• There is less evidence available

• It was a shorter period of time

• It was dominated by a single species

What is a challenge in dividing ancient time periods?

• Inconsistent rock colors

• Too many fossils to analyze

• Limited evidence from that time

• Lack of modern technology