Geologic Time Scale

2. is a geologic period which span 54 million years chunk of the Mesozoic era.
4. the geologic time scale.
6. is a record of the geological events and the evolution of life form as shown in the rock and fossil record.
8. one of three long units of geologic time precambrian and the present.
9. a geological period which span about 145 to 66 million years.
10. is define by the dominance of dinosaur and Pangaea breaking apart.
12. is the geologic period which span 50.5 million years from the end of the permian period.

1. the vast number of years into manageable periods.
3. a gap in the geologic record.
5. is a fossil of an organism that was widely distributed and existed for a geologically short period of time.
7. time begins with a long span of time.
11. one of the units of the geologic time into which geologists divide eras.