Are the youngest rock layers at the top?

Yes, in a typical sequence of sedimentary rock layers, the youngest rock layers are found at the top, following the principle of superposition. This principle states that in undisturbed strata, older layers are buried beneath younger ones. However, geological processes such as folding, faulting, or erosion can disrupt this order. Therefore, while the general rule holds, exceptions can occur due to these geological events.