Pevear, David R.

4 items:

Scanning electron microscope images of pumiceous material from the May 18, 1980. Skamania County, Washington. 1980. Album caption: Scanning electron microscope images of pumiceous material from the May 18, 1980 eruption. B. Interior of pumice clast collected at a depth of 60 cm in a May pyroclastic flow. Temperature of sample when collected was 260°C. Unidentified acicular mineral contains sodium and magnesium. Skamania County, Washington. October 15, 1980. Published as figure 385-B in U.S. Geological Survey. Professional paper 1250. 1981. Handwritten notes on album caption: (Photo by D.R. Pevear) Index card unavailable. Categories: Image; Tags: Mount St. Helens Collection, Pevears, D.R. Collection, Photographers, Skamania County, Washington, Volcanoes, All tags... photo print, Fewer tags
Scanning electron microscope images of pumiceous material from the May 18, 1980 eruption. Yakima County, Washington. 1980. Album caption: Scanning electron microscope (SEM) images of pumiceous material from the May 18,1980 eruption. A. Interior of pumice clast collected in Yakima on May 18. (Photo by D.R. Pevear) Yakima County, Washington. May 18, 1980. Published as figure 385-A in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Pevears, D.R. Collection, Photographers, Volcanoes, Yakima County, Washington, All tags... photo print, Fewer tags
Scanning electron microscope image of chabezite and smectite in an altered clast collected from the debris-avalanche deposit. Washington. 1980. Album caption and index card: Scanning electron microscope (SEM) image of chabezite and smectite (magnesium-iron saponite) in an altered clast collected from the Mount St. Helens debris-avalanche deposit. Washington. 1980. Published as figure 383 in U.S. Geological Survey. Professional paper 1250. 1981. Handwritten notes on album caption: (Photo by D.R. Pevear) Index card unavailable. Categories: Image; Tags: Mount St. Helens Collection, Photographers, Volcanoes, Washington (WA), photo print
Scanning electron microscope image of the interior of a pumice clast. Skamania County, Washington. 1980. Album caption: Scanning electron microscope (SEM) image of the interior of a pumice clast collected at a depth of 60 cm in a May pyroclastic flow from Mount St. Helens. Temperature of sample when collected was 260 degrees C. Image shows a deeply etched plagioclase grain with rounded, silica-coated crystals of analcime (?) and smaller, euhedral crystals of an unidentified aluminosilicate. Skamania County, Washington. October 15, 1980. Published as figure 384 in U.S. Geological Survey. Professional paper 1250. 1981. Handwritten notes on album caption: (Photo by D.R. Pevear) Index card unavailable. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Photographers, Skamania County, Washington, Volcanoes, photo print

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