DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 5.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 7.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 1.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 6.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 4.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 3.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 2.jpg English: Pumice from the Holocene of Washington...
DescriptionPumice (upper Holocene; Johnston Ridge, north of Mt. St. Helens, Washington State, USA) 8.jpg English: Pumice from the Holocene of Washington...
DescriptionDacite pumice (upper Holocene, 22 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 1.jpg English: This is pumice from Mt. Lassen...
DescriptionDacite pumice (upper Holocene, 22 May 1915; Devastated Area, Lassen Volcano National Park, California, USA) 2.jpg English: This is pumice from Mt. Lassen...