In Figure 14.26, there are two intrusions that have been numerically dated using K-Ar techniques:
- Intrusion A (dike) has a K-Ar ratio of 87.5% : 12.5%.
- Intrusion B (granite) has a K-Ar ratio of 75% : 25%.
1. What can we say about the age of layer “F” in both numerical and geologic terms?
- Figure 14.26: “Assembling Geologic Time” (CC-BY 4.0; Chloe Branciforte, own work)