In addition to the geological features in yesterdays post, the Tasman National Park also has the Tessellated Pavement
This siltstone rock platform has the appearance of being tessellated or tiled. Geological stresses have caused the jointing (cracks) in the siltstone. A combination or chemical and physical processes have then eroded the surface and creating the tiled appearance. The physical erosion (wave erosion) caused by water and rock fragments washing over the platform has a greater effect on the joints. The chemical erosion (salt wedging) has a greater effect on the surface between the joints. This is caused by salt crystallising between the rock grains. As the salt crystals grow between the rock grains, they cause the rock surface to flake away.
The above processes, if I have described them clearly, will explain the two main features on the rock platform, namely loaves and pans.
The area nearest the sea is under water longer and thus experiences more physical erosion. This eats away at the joints leaving a loaf formation.