Geologic Time Vocabulary Crossword

6. Are formed from an organism moving in some way, leaving behind a trace or track.
8. A long and distinct period of history with a particular feature or characteristic.
10. The history of Earth is organized in the _____________.
12. A tool used to determine the ages of rock layers is a ___________.
15. Types of rock that are formed by the deposition and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water.
17. A theory that the Earth has been affected in the past by violent events.

1. Originated the theory of uniformitarianism
2. Published Principles of Geology.
3. The era present now.
4. The processes that happened in the past is still happing in the present.
5. The longest of the Phanerozoic eras.
7. When dinosaurs were presented.
9. A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions.
11. An indefinite and very long period of time
13. Is 88% of Earth's History.
14. A fossil formed when an animal, plant, or other organism dies and is covered by sediment.
16. A period of time in history or a person's life, typically one marked by notable events or particular characteristics.