There's a hillock astride the Bolton Darwen boundary, broadly oriented north south. It's in the shape of a long barrow, though there are no identifiable accoutrements. The direction of glacial drift there was from west to east, which should, by rights, have eroded the thing flat. The Bolton Geological Survey, from the 1930's, pointedly shows the direction of glacial drift, there, by arrows, to be south to north. (It's a lovely hill and seems to have been made by making a dirty great linear ditch and heaping up the spoil material).