Geologic Time Scale

4. An oxygen poor environment where over time plant and animal material changes into coal
6. The youngest era of the Phanerozoic eon
8. Connects two continents that were previously separated
10. the extinction of many species on earth within a short period of time
11. These were Mesozoic marine reptiles with small heads long necks and flippers
13. Are dominant Mesozoic land animals that walked with legs positions directly below their hips
14. eons are subdivided into smaller units of time called
15. these are the longest units of geologic time

1. Were Mesozoic flying reptiles with large bat like wings
2. A body of water formed when ocean water floods continents
3. The oldest era of the Phanerozoic eon
5. The middle era of the Phanerozoic eon
7. The separation of a population of organisms from the rest of its species due to some physical barrier
9. eras are subdivided into
12. An accident landmass which separated into present day continents