This cyclical activity is unique to Hoodoo Mountain among the Northern Cordilleran volcanoes. It is associated with the melting of the Fenno-Scandian, Scottish, Laurentide and Cordilleran glaciers. The native Itneg language is a South-Central Cordilleran dialect. Ilocano comprises its own branch within the Philippine Cordilleran language subfamily. This southern part of the Cordilleran Ice Sheet is called the Puget Lobe. The SIL Ethnologue database classifies the languages under the "South-Central Cordilleran" branch. This implies thinning and shearing of the Cordilleran was confined to the fore-arc region. Most ophiolites can be divided into one of two groups&colon; Tethyan and Cordilleran. The inland Cordilleran and Laurentide ice sheets retreated more slowly than did the coastal glaciers. Coastal areas deglaciated rapidly as coastal alpine glaciers, then lobes of Cordilleran ice, retreated. The Cordilleran Ice Sheet covered the North American northwest; the Laurentide covered the east. Cordilleran Ice Sheet covered up to at the Last Glacial Maximum. It is believed that the Cordilleran ice melted rapidly, in less than 4000 years. The Kankanaey language is under the "Central Cordilleran" branch, which also includes Bontoc and Ifugao. Three major ice centers formed in North America&colon; the Labrador, Keewatin, and Cordilleran.