Across
- 4. African American soldiers who served on the frontier
- 5. Great Depression program that built trails in the park
- 8. Flat-topped hill with steep sides
- 9. Rock with pebbles glued together
- 11. Hard sandstone cliffs above Tecovas
- 12. Soft rock made of clay or mud
- 13. Soft, white mineral found in the canyon
- 14. Deep valley carved by a river
- 16. Natural process of wearing away rock and soil
- 17. Top layer, made of caliche and sandstone, protects canyon
- 19. Native tribe who lived in Palo Duro Canyon
- 20. Evergreen tree common in canyon
- 21. Hard rock layer that shields softer ones below
- 22. Wood turned to stone over millions of years
- 23. Rock made from compacted sand
Down
- 1. River responsible for carving the canyon
- 2. Fast-running bird of the desert
- 3. Greenish-gray mudstone with amphibian fossils
- 6. Spiky desert cactus with flat pads
- 7. Reddish sandstone and gypsum, oldest layer of Palo Duro
- 8. Large-eared deer of the Southwest
- 10. Smaller version of a mesa
- 12. Sloping rock formations resembling ruffled skirts
- 15. Tall, thin rock spire shaped by erosion
- 18. Tower-like rock formation in the canyon