
Obsidian possibly used in trephination experiments
1918-1920
1918-1920
1771-1830
circa 2016
1992-1999
1875
1771-1830
1771-1830
1771-1830
1701-1800
1900-1992
2015
1851-1900
1915-1953
1981-1990
1701-1800
circa 2016
circa 2016
circa 2016
circa 2016
circa 2016
1992-1999
1914-1918
2016
1901-1930
1880-1920
1701-1800
1900-1915
1970-1985
1980-1985
1999-2001
1999-2001
circa 2016
1998
2000
1901-1930
1980-1990
1771-1830
1771-1830
1771-1830
1771-1830
1958-1960
1876-1900
1871-1930
1890-1910
1790-1831
1601-1700
1701-1800
1750-1850