16 1
Geologic Principles
• What geologic principles are shown in this diagram?
17 2
Sequences of Events: What is the order of each event shown?
19 3
Radiometric Dating
• U-Pb decay curve• How much of the
daughter element is remaining after 4 half lives?
• What is the age of the sample?
20 4
Potassium-Argon Decay Series
21 5
Parent and Daughter Nuclides
22 6
Cross-Cutting Relationships, Superposition and Correlation
• Determining the age of sedimentary strata by correlation
23 7
Cross-Cutting Relationships
• How old (numerical age) is rock unit A?
• How old (numerical age) is rock unit B?
• How old (numerical age) is rock unit C?
25 8
Note the changes in the time scale as it was revised. What do you think are the reasons for this?