BAM Biographies: Gretchen Luepke Bynum
She began exhibiting mineral specimens from her collection at the annual Tucson Gem & Mineral Show as early as 1957. In 1961 she graduated from Catalina High School in Tucson, after which she attended the University of Arizona where she earned her B.S. in 1965 and M.S. in 1967, both in Geology. After receiving her M.S., Gretchen secured a position as a Geologist with The United States Geological Survey in Menlo Park, Califomia where she served for 32 years.
Gretchen's professional expertise lay in the field of sedimentary river and marine sands and heavy minerals. She was the author and/or editor of many different works in that field, including textbooks and USGS reports. After retiring in 1999, she continued with the USGS as an emeritus employee working on various projects. That same year she married her longtime boyfriend, Robert Bynum, whom she met through a Sierra Club singles event.
Gretchen was an occasional field collector of mineral specimens. She was also a musician (flute), an avid hiker and a supporter of environmental organizations.
Gretchen succumbed to Creutzfeld-Jakov disease in July 2010.
Stability of Heavy Minerals in Sediments (Van Nostrand 1984)
Economic Analysis of Heavy Minerals in Sediments (Van Nostrand 1985)
Heavy-Mineral data from samples collected in Willapa Bay and vicinity, Washington (1982)
Sand-sized heavy-mineral distributions in offshore insular shelf sediments of north-central Puerto Rico (1993)
Titanium analyses of black sands from six beaches, San Francisco and San Mateo Counties, California (1987)
Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California (1994)
Heavy minerals from cores in a deep-sea channel off Cape Mendocino, California (1995)
Sand-sized heavy-mineral distributions in the Rio Cibuco system and adjacent rivers of north-central Puerto Rico (1993)
Areal and textural distribution of particulate gold in sediments from Bluff Beach, Alaska (1981)
Bibliography of the geology of the Oregon-Washington continental shelf and coastal zone, 1899-1978 (1980)
Distribution of economic heavy minerals in sediments of Saco Bay, Maine (1986)
Economic heavy minerals in glaciofluvial sediments in Minnesota (1993)
Economic heavy minerals in sediments from an off-shore area east of Cape Charles, Virginia (1991)
Grain-size, heavy-mineral and geochemical analyses of sediments from the Chuckchi Sea, Alaska (1989)
Occurrence of platinum in a black sand from a beach deposit in San Mateo County, California (1991)