
Obsidian possibly used in trephination experiments
1918-1920
1918-1920
1918
1919
1952-3
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1919
1919
1921
1668; 1924
1921
circa 1919
circa 1920
1920
1990-96
1610; 1923
1772 (original); 1919 (model)
1921
2000-100 BCE
1925; 1862
1990-95
1934
1920
1920
1934
1910 - 1954
1921
1580-1588; 1930
1921
1903 (original); 1982 (model)
4000-2001 BCE
1960-1979
2050-1750 BCE
1918-1920
1955; 1830
1918
1936
1919 - 1995
1920
1834-1836
1919-1920
1798 (original); 1977 (model)
1879 (1956)
2000-1001 BCE
circa 1920
1918
1918-1920
1801-1892 (prepared); 1946 (element replaced)
1918 - 2010
1888; 1984