Across
- 1. most recent era
- 3. each era is divided into
- 4. subdivision of the geologic timescale
- 5. biological change continued through ___________
- 8. a record of the life forms and geological events
Down
- 2. technique used to date materials
- 3. drastic change in the history of animal life
- 4. next largest division of the geologic time scale
- 6. contains fossils and stacked in layers
- 7. any preserved evidenceof any organisim