40 Million Years Before Present   20 Million Years Before Present                                      
35 MBP
  
10-2 MBP
  
  18,000 BP      
10,000-5,000 BP
                                                
 
25 MBP
   2-3 MBP         15,000 BP           3,000 BP                                          
          18,000 BP                
1,100-700 BP
             16071634
1650-1750
Mid-late 1700's1790-1820
 1812-18141829 1840's 1861-18651880-1930 1930's1941-1945
1970's
1990's-present
                   
10,000-1,200 BP
              
1524
  
16191646
  
1700-1760's
1775-17831792
 1813 mid-1800's1850's-1880's 1862 1900-19201940's 1952 1964
 
                                  1000       1500  
1620-1695
 1700's   1760's-1770's 18001820-1880 18351850
1880-1930
 1900-1918 1950's-1970's 1970's19831989-2000 2002
                                      1300   
1524
  
1650
1750
1830's-1880
1840's 1870's Early 1900's1930
1955-1960
 19721987-present 2000

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