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Historical Archaeology is the study of the material remains of past societies that also left behind documentary and oral histories.
In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.
1947: Upward trend in world production of aluminum begun (Encyclopedia Britannica 1973 (1): 694).
1820-1925: Tooled finish (Jones and Sullivan 1985: 165).
1855: Introduced in Paris Exposition (Encyclopedia Britannica 1973 (1): 693).
1886: Modern electrolytic method of producing aluminum discovered by Charles Martin Hall in the United States and Paul L. Heroult in France (Encyclopedia Britannica 1973 (1): 693). 1920: Beginning of commercial production of aluminum foil; used to wrap tea, candy, gum and cigarettes (Sacharow 191).