Iron Trig cone description and statistics

Type:	Scoria cone and lava-flow apron
Seismically Monitored:	No
Distance:	233 mi (375 km) from Anchorage
Elevation:	4259 ft (1298 m)
Latitude:	58.64226° N
Longitude:	154.47059° W
Quadrangle:
CAVW Number:
Location Map:
Pronunciation:	Sound file

This feature is part of the Savonoski River Cluster of volcanoes, as defined by Hildreth and others (2004). From Hildreth and others (2004): "Iron Trig Cone (Peak 4260) is a mafic scoria cone (53-54% SiO2) atop the basement divide between the Savonoski and Kamishak Rivers, 50 km NE of Mount Katmai and 25 km north of Mount Denison. The glaciated cone, 800 m across with 250 m relief, consists of stratified scoria, agglutinate, and thin lava sheets that are cut by a small intrusion exposed on the west face. Ejecta and lava contain phenocrysts of plagioclase, olivine, clinopyroxene, and magnetite. A lava-flow apron (88 +/- 27 ka) descends the WSW flank to an elevation 300 m lower than the cone, condensing into a single flow 20 m thick at its eroded terminus, 2 km from the cone."