The wikipedia page on Ice-sheet dynamics claims that:
Ice will not flow until it has reached a thickness of 30 meters (98 ft)
And this geography website claims that
To be called a glacier, a mass of ice must be capable of motion.
Together, these two claims seem to imply that if it's not thicker than 30m, it's not a glacier. Are either of these claims correct, and do they indeed imply my conclusion?
N.B. The question arises because I've been working with some literature and databases that refer to things less than 30m thick as glaciers.
Update: looking closer at GlaThiDa, I notice that it contains 490 glaciers listed with mean_depth less than 5m. However, all of these are from a single article (Cogley, 2008) and some of them are apparently only centimeters thick. Something must be wrong with this data; I'm looking into it.