Across
- 3. History of life as documented by all fossils
- 6. Fossils that indicate the boundaries of geological time
- 7. The newest rock layers are on top and the oldest are on the bottom layer
- 8. A branch of geology dealing with how sedimentary rock layers are arranged
- 10. Layers of sedimentary rock
Down
- 1. Determines the relative order of past events
- 2. All of earth's history represented on a chronological chart
- 4. Time of the dinosaurs
- 5. Preserved remains or traces of animals or plants
- 9. Marks the beginning of earth 4.6 years ago