Final answer:
A fault is represented by a displacement of rock layers in a geologic cross-section, not necessarily associated with a specific rock type but with the movement along a fracture.
Step-by-step explanation:
The geological site that indicates a fault is an area where there has been a displacement of the Earth's crust along a fracture. In a geologic cross section, a fault is represented by lines that show the displacement of rock layers. Igneous rocks are formed from solidified magma or lava, sedimentary layers are made from deposited sediment that turns into rock over time, and metamorphic outcrops are rocks that have been changed by heat and pressure. An unconformity, however, refers to a contact between two rock sequences: one being much older than the one above, such as nonconformity, disconformity, or angular unconformity. In the context provided, an unconformity like a nonconformity forms when horizontal layers of sedimentary rock are deposited directly on top of eroded igneous or metamorphic rock, suggesting a significant geological time gap and changes in the depositional environment.