erratics
ɪˈratɪk
noun
a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action.
the source of stone for the whetstones may have been glacial erratics
noun
a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action.
the source of stone for the whetstones may have been glacial erratics