Extension of the Bethlehem, New Hampshire, Moraine

Moraines at Bethlehem, New Hampshire, on the northwestern slope of the White Mountains have been known for eighty-seven years and were shown by Goldthwait to have been made by a re-advance of the continental ice sheet at the close of the last glaciation. They were formerly known to extend intermittently for 12 miles. This study shows that there are moraines west of those previously known and also exposures of two till sheets, proving that there was a re-advance of the ice over a front of at least 25 miles and possibly 50 miles. These moraines have been correlated with the varved clay studies of Antevs, which showed that the ice sheet re-advanced to the mouth of the Passump-sic River and uncovered it the second time about two hundred and eighty years after the first uncovering. The moraines were formed by a re-advance of the ice during the closing stage of the last glaciation.