1  C-14 Dates                                                                  
 2  Calcium Carbonate Stratigraphy                                              
 3  O-18 Stratigraphy                                                           
 4  Biostratigraphy                                                             
 5  1,2,3,4                                                                     
 6  2,3,4                                                                       
 7  2,3                                                                         
 8  2,4                                                                         
 9  Varves                                                                      
10  Pollen Stratigraphic Dates                                                  
11  3,4