Waves crashing on the sand and then running up and down the beach scarp. I was standing there watching the water when I heard the sound of fish slurping, but couldn't locate where it was coming from. I turned around and these geysers were located in a pool on the beach side of the scarp. If you followed the water down it eventually made a left turn to the water. That is how a pocket and trough is formed. Neat stuff.
