Geologic Time Scale activity - Free Printable

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1. The geologic time scale is a system of chronological dating that relates geological strata to time, used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events in Earth's history.

2. The major unit of geologic time is an eon.

3. On the geologic time scale, periods are divided into epochs.

4. Many scientists estimate Earth to be approximately 4.54 billion years old.

5. You are living during the Cenozoic Era.

6. The three eras of the Phanerozoic Eon are the Paleozoic, Mesozoic, and Cenozoic.

7. Scientists have developed the geologic time scale by studying rock layers (stratigraphy), fossil evidence (biostratigraphy), radiometric dating of rocks, and correlating these data globally to establish a timeline of Earth's history.

- Bacteria: Precambrian
- Seed plants: Paleozoic
- Modern human: Cenozoic
- Flowering plant: Cenozoic
- Mammoth: Cenozoic
- Reptiles: Paleozoic
- Tyrannosaurus rex: Mesozoic
- Fishes: Paleozoic
- Horse: Cenozoic
- Insects: Paleozoic

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Geologic Time Scale activity - Free Printable

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