1960- 88
20th century 41
21st century 29
19th century 12
1945-1960 5
1945-1989 5
1884-1960 4
2000- 4
To 1884 4
1884-1918 3
1857-1924 2
1945-1953 2
To 1498 2
1304-1377 1
16th century 1
1759-1817 1
17th century 1
1805?- 1
1821-1881 1
1833-1885 1
1836-1909 1
1837-1901 1
1838-1914 1
1853-1902 1
1866-1955 1
1881-1899 1
1884-1937 1
1884-1972 1
1890-1969 1
1894-1955 1
1899-1961 1
18th century 1
1901- 1
1905-1961 1
1909-1972 1
1912-1951 1
1912-1956 1
1913-1996 1
1914-1922 1
1918- 1
1918-1933 1
1919-2013 1
1924- 1
1925-2022 1
1931- 1
1933-1945 1
1938- 1
1944- 1
1945- 1
1945-1962 1
1957-1979 1
1959-1990 1
1960 1
1961-1963 1
1966- 1
1977-1981 1
1978-2002 1
1988 1
1989- 1
1990- 1
1991- 1
1991-2000 1
1993-2001 1
British occupation, 1882-1936 1
French occupation, 1881-1956 1
Mesozoic 1
Tertiary 1
To 1863 1