ASBOG Practice Exam

According to the law of superposition, younger layers of rock are found where?

1. At the bottom of a sequence

2. Above older layers

3. Next to faults

4. Near the surface

The correct answer is: Above older layers

The law of superposition is a fundamental principle in geology that states in an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom, and the younger layers are successively deposited above them. This principle allows geologists to determine the relative ages of rock layers and understand the geological history of an area. By understanding this law, it becomes clear that younger layers of rock are found above older layers in a sequence. This arrangement occurs because, as sediment is deposited over time, newer materials cover the older layers. This theory aids in constructing geological columns and understanding stratigraphy. The other options relate to concepts in geology but do not accurately reflect the implications of the law of superposition. For example, while younger layers may be found nearer the surface in some contexts, this isn't universally applicable, especially after geological disturbances.