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Across 4. HUGE DRAGONFLIES AND COAL FORESTS APPEAR IN THIS EPOCH 5. DINOSAURS BECAME EXTINCT 6. DINOSAURS THRIVE DURING THIS PERIOD 12. A PERIOD THAT SPANNED BETWEEN 4.6 B.Y.A. TO 544 M.Y.A. 13. AN ERA THAT SPANNED FROM 544 M.Y.A. TO 245 M.Y.A. 14. AMPHIBIANS REACHED LAND DURING THIS PERIOD

Down 1. EPOCH WHERE GREAT SWAMP FORESTS COVERED EASTERN N. AMERICA 2. MASSIVE EXTINCTION OF INVERTEBRATES OCCURRED 3. FIRST MAMMALS AND CONE-BEARING TREES AROSE 7. MAMMALS ARE DOMINANT 8. A PERIOD IN WHICH JAWLESS FISH BECAME COMMON 9. HOMO SAPIENS EVOLVE 10. THIS PERIOD INCLUDED THE RISE OF TRILOBITES AND MARINE INVERTEBRATES 11. LAND PLANTS APPEAR DURING THIS PERIOD