Dune and geosol deposition
Alternatively, there are large dunes which merge seaward with, but do not rest upon, high Pleistocene beach deposits. These dunes show that dune building could take place at the height of transgression and then cease without subsequently prograding seaward over the beach.
Dune building could have occurred between maximum and
minimum sea levels. Partially submerged foresets are proof that dunes were
active when the sea level was lower than present. However, due to the extent
in the drop in sea level during glacial episodes, the possibility of significant
dune activity at minimum sea level can be ruled out. At these times the
coast would have been beyond, and well below the rim of the platform; and
the steeply sloping, or cliffed, shoreline would have prevented dune growth.