Exercises Geologic History 1. On the lines under each of the four scenarios, explain what has happened over time from the oldest event to the youngest event. Be sure to include events such as folding, faulting, uplift, and erosion, and identify intrusions, faults and unconformities. Also, explain what principle (Superposition, Original Horizontality, or Cross-cutting) was used to determine what event took place first. You may not use every line, or you may need more space depending on how descriptive you get. Youngest 10. A 9. B 8. 7. 6. E S.sconfernntu 5. F . 3. 2. Oldest 1. Youngest 10. E Tgneous intrasion crosscutting 9. A Dis 8. B D.S 7. C fault cross cutting 6. D Discon formity 5. G Dsconformity 4. Pisconformity 3. 2. Oldest 1..