Based on the block diagram below,the igneous intrusion labeled B is younger than Unit 2.What stratigraphic principle allowed you to determine this observation?
A)principle of superposition
B)principle of faunal succession
C)principle of original horizontality
D)principle of cross-cutting relationships

Question

Based on the block diagram below,the igneous intrusion labeled B is younger than Unit 2.What stratigraphic principle allowed you to determine this observation? 
A)principle of superposition 
B)principle of faunal succession 
C)principle of original horizontality 
D)principle of cross-cutting relationships

Quizplus · Accepted Answer

The principle of cross-cutting relationships states that if a geological feature cuts across another feature, the feature that is cut must be older than the feature that cuts across it. In this case, igneous intrusion labeled B cuts across Unit 2, indicating that Unit 2 must have been present before the intrusion occurred, and therefore Unit 2 is older than the intrusion.

Based on the Block Diagram Below,the Igneous Intrusion Labeled B