It can be a bit of a game of chicken, walking to the distant edge as the tide is turning. The water doesn’t come straight back in, like the pulling up of a sheet, but rather sneaks around the far ends of the gentle rises, out of sight. You can suddenly be on a rapidly shrinking island, with the stretches of water on all sides getting wider and deeper --and colder!
A lonely Heart...Cockle (Clinocardium nuttallii).
Three sets of Varnish Clam valves (Nuttallia obscurata---introduced from Asia). Something in their hydrodynamics leaves most of them external surface-up when the water recedes. Their inside surfaces are prettier
A particularly attractive heap of lugworm poop.