granite boulder that was originally located at the summit of Rollstone Hill in Fitchburg, Massachusetts. It was carried by the last glaciation from central New Hampshire. Threatened by quarrying operations, it was moved to Litchfield Park in downtown Fitchburg in 1929-1930. The northern portion of the town of Waterville, Washington has a large number of large basalt erratics, particularly along the moraine running east–west from McNeil Canyon. Tripod Rock in Kinnelon, New Jersey is noteworthy for being perched on three smaller boulders. Balance Rock in Princeton, Massachusetts is located at the base of Mount Wachusett, on the northwest side. Flood-borne erratics If glacial ice is "rafted" by a flood such as that created when the ice dam broke during the Missoula Floods, then the erratics are deposited where the ice finally releases its debris load. One of the more unusual examples is found far from its origin in Idaho at Erratic Rock State Natural Site just outside McMinnville, Oregon. The park includes a specimen, the largest erratic found in the Willamette Valley. See also Glacial erratic boulders of the Puget Sound region Grannie stone Jasper conglomerate Precarious boulder Sunday Rock Willamette Meteorite References Imbrie, J. & K. P. Imbrie. Ice Ages, Enslow Publishers, Hillside, New Jersey, 1979. External links Royal Alberta Museum