If anyone has a broken stal and can supply some context and ideally photographs (ie where from, what it overlies and where in the passage it came from) then don't throw it away or sell it, it may be suitable for U-Th dating. Clean stalagmites are ideal, but flowstone is OK. Straws, curtains and muddy or recrystallised stalagmites aren't much good.
If you do have some, you can send them to me (for contact details, send a PM). At least that way the material won't be lost, even if it can't be dated.
Andy