Question - The idea that fossil content will change upward within a formation is called the

The idea that fossil content will change upward within a formation is called the 

(a) Principle of Cross-Cutting Relationships 

(b) Principle of Original Horizontality 

(c) Principle of Fossil Succession 

(d) Principle of Original Continuity 

(e) Principle of Superposition

Answer Key: (c) Principle of Fossil Succession