For these and other contributions to Concord, Brown was named Concord’s Honored Citizen in 1967. The couple had two daughters, Patricia and Shirley, and a son, Christopher.SCOPE AND CONTENT: Collection contains 12 black and white wide-angle panoramic images of Concord, dating from September 1955 to November 1958.For example, ash from the large eruption which formed Crater Lake in Oregon has been identified at hundreds of locations in western North America, in at least one bog in eastern North America, in ocean floor sediments, and more than 5,000 km from it's source in Greenland ice.The electron microprobe is the primary analytical tool for tephrochronology.
The tephra lab uses the ARL-SEMQ microprobe as the primary tool for chemical fingerprinting.
It is most commonly used to analyze the glass fraction of tephra for major and minor element abundances and thereby provide a chemical fingerprint which allows ash from different eruptions to be uniquely identified.
Mineral abundances, mineral compositions, particle size and shape, layer thickness, trace-element abundances in the glass, stratigraphic relations, and dating are also employed.
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