Question

order the events to demonstrate the age relationship between fault a, fault b, the sandstone, and the conglomerate.
formed first
formed second
formed thirdly
formed last
fault a
fault b
sandstone
conglomerate

Explanation:

Step1: Apply the principle of superposition

In geology, the principle of superposition states that in undisturbed sedimentary rock layers, the oldest layer is at the bottom. Here, the sandstone is below the conglomerate, so the sandstone formed first.

Step2: Analyze the faults and dikes

Faults and dikes are younger than the rocks they cut through. Fault B cuts through the batholith and Dike B. Fault A cuts through Fault B, Dike A, and the sandstone. So Fault B is older than Fault A.

Answer:

Sandstone - formed first; Fault B - formed second; Fault A - formed thirdly; Conglomerate - formed last.