Lesson Worksheet: The Geologic Time Scale Geology

In this worksheet, we will practice recognizing the geologic time scale and how geological time is classified and divided up using dating methods such as radiometric dating and index fossils.

Q1:

Which is the correct order that represents the divisions of geologic time in descending order of duration?

  • AA period, an epoch, an era, an eon
  • BAn eon, an era, a period, an epoch
  • CAn eon, an era, an epoch, a period
  • DAn era, an eon, an epoch, a period
  • EAn era, an eon, a period, an epoch

Q2:

Which of the following are eras in Earth’s geological history?

  • AProterozoic, Phanerozoic, and Mesozoic
  • BPaleozoic, Mesozoic, and Permian
  • CPaleozoic, Mesozoic, and Cenozoic
  • DPhanerozoic, Mesozoic, and Cenozoic
  • ETriassic, Jurassic, and Cretaceous

Q3:

True or False: Radiometric dating uses the decay of radioactive substances to determine the age of Earth, which is approximately 4.6 billion years old.

  • ATrue
  • BFalse

Q4:

True or False: One of the reasons the fossil record is incomplete is that most organisms either decay or are eaten by other organisms soon after death, and so they are not preserved.

  • AFalse
  • BTrue

Q5:

At the end of which period did dinosaurs become extinct?

  • AJurassic
  • BTriassic
  • CPermian
  • DSilurian
  • ECretaceous

Q6:

Which animals dominated the Mesozoic era?

  • AInsects
  • BAmphibians
  • CDinosaurs
  • DBirds
  • EMammals

Q7:

Which of the following represents approximately 87% of Earth’s age?

  • APrecambrian
  • BCenozoic
  • CCambrian
  • DPhanerozoic
  • EPermian

Q8:

What is the most recent epoch in geological history according to the geologic time scale?

  • APhanerozoic
  • BCenozoic
  • CQuaternary
  • DHolocene
  • EPermian

Q9:

What is the index fossil most commonly seen in rocks deposited in the Triassic period?

  • AAmmonite
  • BMammoth
  • CSeed fern
  • DTrilobite
  • ENummulite

Q10:

True or False: Earth’s geological history is divided up into a series of time intervals of equal lengths.

  • AFalse
  • BTrue

This lesson includes 13 additional questions for subscribers.

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