Well glass from broken bottles etc that is on the coast will get its sharp edges worn away and become smooth and changes transparancy too, so we call it see glass. Well pottery shards that is the name of broken pottery from plates and tiles etc, if you are lucky you can find from the Roman times or even before.
Thanks so much Amber and have a superb weekend!
And how would we know that it is that old?
Research we know what pottery looks like from periods in history.
O.O