This nearly east-west line of volcanoes stretches from the west coast of B.C., just north of Vancouver Island, and reaches into the Interior Plateau near Quesnel. Most of the volcanoes get younger going from the coast to the interior, and probably formed as a result of the North American continent sliding westward over a small "hotspot", like the one feeding the Hawaiian Islands. These volcanoes include the Rainbow, Ilgachuz, and Itcha ranges, and the Nazko cone, which is only 7200 years old. However, the small volcanoes of the Milbanke Sound group, at the extreme western end of the Anahim Volcanic Belt, do not follow this eastward-younging trend: they erupted after the last major glaciation, meaning they are less than 10,000 years old, much younger than all other volcanic deposits at that end of the Anahim Volcanic Belt. For convenience, they are included geographically with the eastward-younging Anahim Volcanic Belt. Very little is known about the Milbanke Sound group, which includes Kitasu Hill, Helmet Peak, Price Island, Dufferin Island, and Finngal Island. It is possible that these small volcanoes represent a far-north extension of the Garibaldi Volcanic Belt; however, there are currently insufficient data to evaluate this hypothesis.