In a series of undisturbed rock layers where shale lies between sandstone below and limestone above the?

In a series of undisturbed rock layers, the principle of superposition indicates that the sandstone layer is the oldest, lying beneath the shale, which is younger. The limestone layer above the shale is the youngest of the three. This stratigraphic arrangement reflects the sequential deposition of sedimentary rocks, with each layer representing a distinct period in geological history. The presence of these different rock types can also suggest varying environmental conditions during their formation.