Oysters were the protin for the ports. They don't live up this far, but they were a fished out up in the estary and brought up here. Even the romans thought we were great for oysters. And theyd barrel them up and sent them back to rome. So when you are looking, you're looking for areas that are eroding. That's te patches har eroding. When stuff comes out, the river starts to sort it by size and weight.