The Willamette Meteorite, officially named Willamette,[3] is an iron-nickel meteorite discovered in the U.S. state of Oregon. It is the largest meteorite found in North America and the sixth largest in the world.[4][5] There was no impact crater at the discovery site; researchers believe the meteorite landed in what is now Canada or Montana, and was transported as a glacial erratic to the Willamette Valley during the Missoula Floods at the end of the last Ice Age (~13,000 years ago).[6] The meteorite is currently on display at the American Museum of Natural History, which acquired the meteorite in 1906.[5] Having been seen by an estimated 40 million people over the years, and given its striking appearance, it is among the most famous meteorites known.
http://en.wikipedia.org/wiki/Willamette_Meteorite