Across
- 1. coal forming forests
- 2. Abundant amphibians and marine organisms
- 3. lots of dinosaurs
- 6. Earliest amphibians and plant seeds
- 9. start of the solar system
- 10. Earths first coral reefs
- 11. earliest mammals
Down
- 1. Abundant reptiles
- 4. Earliest flowering plants
- 5. burgess shale fauna
- 7. earliest insects
- 8. First sexually reproductive organisms