AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
About Alaska's Volcanoes | Map & Alphabetical List | Interactive Map | Latitude/Longitude List | Eruption Search | Volcano Search | Folsoms Bluff 
You are here: Home > Volcano Information > Folsoms Bluff

Folsoms Bluff description and information

FOLSOMS BLUFF LINKS

SAMPLES
LOCATION
FACTS
Type:Lava and ejecta of glaciated vent complex
Most Recent Activity:
Seismically Monitored: No
Elevation: 3799 ft (1158 m)
Latitude: 58.40881° N
Longitude:155.21516° W
Quadrangle:Mt Katmai
CAVW Number:
Pronunciation: Sound file
Nearby towns:King Salmon 55 mi (89 km) NW
Karluk 64 mi (103 km) SE
Kanatak 65 mi (105 km) SW
Bristol Bay Borough 68 mi (109 km) NW
Anchorage 268 mi (431 km) NE
DESCRIPTION
This feature is part of the Saddlehorn Creek Cluster of volcanoes, as defined by Hildreth and others (2004). From Hildreth and others (2004): "Folsoms Bluff (Knob 3800), an inhomogenously andesitic (55-60% SiO2) funnel-shaped vent complex, is a multi-lobate glassy lava mass 500 m wide and 200 m high that makes up part of the canyon wall just 2 km east of Fenners Saddlehorn. Marked by steep flow foliation and several sets of inclined, subhorizontal, or steeply curving glassy columns indicative of ice-contact emplacement, the lava has a brecciated base that overlies 8 to 15 m of stratified, poorly sorted proximal fallout, which includes scoria bombs to 75 cm and blocks of basement granitoid to 30 cm. This basal fallout drapes a steep paleoslope and extends uphill into a mass of agglutinated lithic-rich rubble more than 20 m thick, probably vent fill largely concealed by the overlying lava. All lithologies contain abundant small plagioclase phenocrysts as well as olivine, clinopyroxene, orthopyroxene, and magnetite. Its canyon-wall setting and eruptive facies relations suggest that, like Fenners Saddlehorn nearby, this undated glassy unit is younger than the three ridge-capping members of the cluster."
Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/volcanoes/volcinfo.php
Page modified: June 12, 2014 07:20
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS