Gnarl Ridge lava flows from about 350 ka at base to 200 ka at top, ...
Detailed Description
Northward view of Lamberson Butte, the summit of Gnarl Ridge on east flank, which is composed of two sequences of andesite lava flows. Flows at base are about 350,000 years old; those forming middle to upper part of ridge are about 200,000 years old. Newton Creek is at base of ridge in foreground; total relief is about 1,000 feet (300 meters).
Related
Eruption History of Mount Hood, Oregon
Mount Hood, which has been active for at least 500,000 years, occupies a long-lived focus of volcanic activity that has produced ancestral Hood-like volcanoes for the past 1.5 million years.
Related
Eruption History of Mount Hood, Oregon
Mount Hood, which has been active for at least 500,000 years, occupies a long-lived focus of volcanic activity that has produced ancestral Hood-like volcanoes for the past 1.5 million years.