Question

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1. use the law of cross-cutting relationships to put the following features in sequence for each cross-section below:

b - intrusion of pluton
d - intrusion of dike
h - fault
m - unconformity

a) put the four labeled features in sequence from oldest to youngest:
______ youngest
______
______
______ oldest

what kind of unconformity is m?

Explanation:

Analyze the cross-cutting relationships

We apply relative dating principles.
The pluton \(B\) is cut by fault \(H\).
Thus, \(B\) is older than \(H\).

Determine the age of the unconformity

The unconformity \(M\) erodes both \(B\) and fault \(H\).
Therefore, \(M\) is younger than \(H\).

Determine the age of the dike

The dike \(D\) cuts through the unconformity \(M\) and upper layers.
Thus, \(D\) is the youngest feature.

Identify the type of unconformity

Unconformity \(M\) separates older igneous pluton \(B\) from younger sedimentary layers.
This boundary represents a nonconformity.

Answer:

Question 1

a) Put the four labeled features in sequence from oldest to youngest:

D youngest
M
H
B oldest

Question 2

What kind of unconformity is M?

Nonconformity