If you call it what it truly is, which is a concretion, then there is not much doubt to your colleagues that you are spot on accurate. If you talk about paint pots to those same people, your credibility comes into question right away as that is incorrect terminology--just uneducated, misleading layman's terms. Consider what I've just told you and decide what you should call it.
Thanks - to be fair I think being open to both thought processes would be where it's at. I wouldn't say explaining what it's been shown to be as you mentioned and then the idea that these were used as paint pots (which have been found too) isn't something to make someone think I was uneducated. Thanks for your input.