http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Geologic names of North America introduced in 1936-1955
by Druid Wilson, William J. Sando, and Rudolph W. Kopf.
"A compilation of new geologic names of North America, including Greenland, the West Indies, the Pacific Island possessions of the United States, and the Trust Territory of the Pacific Islands."