Global Volcanism Program | Image GVP-06557
Phantom Ship is the eroded remnants of resistant dikes that now rise above the waters of Crater Lake. These dikes were feeders for lavas of Phantom Cone, the oldest of the known pre-collapse edifices forming Mount Mazama. Phantom Cone lavas have been dated to about 400,000 years before present and are exposed in the SE wall of the Crater Lake caldera.
Photo by Lee Siebert, 1997 (Smithsonian Institution)