Which principle states that rock fragments in sedimentary layers must be older than the surrounding sediments?
A) Principle of inclusions
B) Principle of unconformity
C) Principle of cross-cutting relationships
D) Principle of superposition
The principle of inclusions states that any rock fragments in a sedimentary layer must be older than the layer. For example, the cobbles in a conglomerate must have been formed before the conglomerate.
