Seaside Monochrome

Sun only visible through a veil of cloud today, so I've blipped a monochrome from my walk with my Springer, Sam.
These used to be barnacles, but the barnacles are long gone, leaving only the sterile empty shells. This part of Redcar beach is normally under several feet of sand, but the storm tides this winter have shifted all of that and left the Redcar Mudstone, complete with its rocks, totally exposed.