@TomTomBinks,
we need to think in a time scale that occupies several thousands of years for a landscape form.
Water could be seeping in and eroding the rocks on between the "dense layers "
The reason I am not fully convinced that this area does not represent a series of igneous "Sills" is the nature of the rock itself, its apparent denseness and the "rusty look that doesnt seem to follow a "bedding plane")>
If youve ever seen the banded iron sandstones of the Mesabi, or iron rocks of the
US ATlantic Coastal Plain , The "rust" follows the bedding since its those layers that contain the "bog ore" and serve as a source for the rust. Here its almost vertical, indicating an oxygenated water in the joints and fractures thats causing the rust