A monstrous great dyke of pebbles

I'm actually paraphrasing J M Falkner from the novel, Moonfleet. A tale of derring do and such like. The description is meant for Chesil Beach in Dorset, one of my favourite places and it sill scares the hell out of me. The first time I went there as a child it was a windy, stormy day, so to stand on the pebble bank was terrifying.

This is my usual haunt, the estuary/river Ogwr, and this bank of pebbles seems to be another change to the layout of the water way.