Across
- 2. 2500 to 1850 million years ago
- 3. skied on xenolith composed of quartzite
- 7. cooked sandstone
- 12. fluvial structure caused by sediment grinding under eddy
- 14. crushed rock by lateral movement
- 15. locally called rotten granite
- 16. volcanic plug
- 18. solid rock exposed at the surface
- 19. crack in crust formed by divergent plates
- 20. orogeny that closed the mid-continent rift
- 21. steep face of eroded sedimentary rock
Down
- 1. mountain range once in northern Wisconsin
- 4. provinces based on topography
- 5. country rock carried up by volcanic activity
- 6. small cracks showing no movement
- 8. great lake formed by mid-continent rift
- 9. "you've seen [one], you've seen them all"
- 10. oldest sedimentary rock in Wisconsin
- 11. walled gorges generally with rapids
- 13. isolated 'mounds' of Cambrian sandstone
- 17. mountain building process
- 18. large grantitic intrusion
- 19. ridges and valleys made by moving water