lost in the mists of time

lost in the mists of time

Occurring so far in the past as to be totally forgotten by those in the present. For all that we've learned about these ancient structures, most of their purpose has been lost in the mists of time.
See also: lost, mist, of, time
References in periodicals archive ?
He was presented with a an engraved wine decanter by club chairman John Bell and in reply pointed out he only won one trophy at Newbiggin, but that was lost in the mists of time as, after the clubhouse burned down, the new trophy winners boards didn't go far enough back