Week 17 Vocab Geologic Time Scale record of

Week 17 Vocab § Geologic Time Scale- record of Earth’s history from its origin 4. 6 bya to the present. § Eon- longest time unit in the geologic time scale

Week 17 Vocab § Geologic Time Scale- record of Earth’s history from its origin 4. 6 bya to the present. § Eon- longest time unit in the geologic time scale § Era- second largest time unit in geologic scale, measured in 10 s to 100’s of millions of years, defined by changes in life forms. § Period- third longest time unit in the geologic scale, measured in tens of millions of years.

Week 17 Vocab § Geologic Time Scale- record of Earth’s history from its origin 4. 6 bya to the present. § Eon- longest time unit in the geologic time scale § Era- second largest time unit in geologic scale, measured in 10 s to 100’s of millions of years, defined by changes in life forms. § Period- third longest time unit in the geologic scale, measured in tens of millions of years. § Epoch- time periods measured in 100, 000’s to million of years. § Precambrian- geologic time consisting of the first three eons during which Earth formed and became habitable.

Week 17 Vocab Quiz § Geologic Time Scale § Era § Eon § Epoch § Period § Precambrian

Silurian- 24 Devonian-61 Carbiniferous-60 Permian-47 Triassic- 50 Jurassic-56 Cretaceous- 79 Paleogene-43 Neogene-20 Holocene-. 01