I used to go metal detecting along the Thames foreshore in the '70's. It was great fun, but not without its dangers; rising tides, deep mudholes etc.
Strangely, below the top silt there is a thick deep bed of clay and artefacts, including metal such as coins are well preserved. I was always surprised at how many old clay smokers pipes I always managed to find. I believe it is much more difficult to get permission to explore along the foreshore nowadays.
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