Phantom Ship
Posted by: 
Volcanoguy
N 42° 54.844 W 122° 04.287
10T E 575790 N 4751690
Quick Description: Geologic history sign at the Phantom Ship Overlook.
Location: Oregon, United States
Date Posted: 11/10/2009 4:21:30 PM
Waymark Code: WM7MX3
Views: 0
Long Description:
Marker Name: Phantom Ship
Marker Text: At first glance, the cluster of dark, jagged
rocks just off-shore calls to mind the image of a ghostly ship with
tall masts and drooping sails. The “Phantom Ship” is actually a
remnant of an ancient volcano called the Phantom Cone.
Unlike the youthful Wizard Island made mostly of cinders erupted
within the last few thousand years, the dense lavas of Phantom Ship
may be more than 400,000 years old - the oldest exposed rocks in
the Crater Lake caldera.
The ship consists of two overlapping andesitic lava flows, part of
the layering within the Phantom Cone. The subsequent growth of Mt.
Mazama - a much larger volcano - engulfed the Phantom Cone. After
Mt. Mazama collapsed, Phantom Ship was exposed. It is part of a
ridge that protrudes from the caldera wall. Most of the ridge is
now submerged, leaving Phantom Ship stranded off shore.
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