Methodology for Ruddiman CaCo3% Samples:

The CO3 database consists of measurements from several hundred
cores in the world ocean, primarily in the Atlantic.  These data
were derived from several sources.  Many of the cores were
analyzed for the CLIMAP project funded by NSF.  The resulting CO3
curves were used for stratigraphic control and local
correlations.  Other analyses were run for various regional
paleoceanographic studies at Lamont-Doherty.

On average, the cores span intervals of time of about 100,000 to
200,000 years and have been sampled at the equivalent of every
3,000 to 10,000 years.  Almost all cores have been analyzed by 1
of 2 techniques:

Mercury Rig
Ref: Hulsemann, 1966, J. Sed Pet.           3-4% Reproducibility

Vacuum Precision
Ref: Jones & Kaiteris, 1983, J. Sed. Pet.     1% Reproducibility

A few records were analyzed by the "Karbonate Bomb" method, ref:
Muller & Gastner, 1971, N. Jahrb. Mineral. Monatsh.


The samples analyzed consisted of either bulk sediment, or
fine-fraction sediment passed through a 63 or 74 micron sieve.
Sample type is noted in the filename of each record, though there
is generally little difference between fine-fraction and whole
sediment values.

Analysis Technique abbreviations (MR, VP, KB) and Fine vs Total
Samples abbreviations (FF, TF) are listed at the end of the header
line in each data file.  File names consist of ship, cruise, and
core ID codes. 
                            A  - ATLANTIS                                       
                            K  - KANE                                           
                            V  - VEMA                                           
                            RC - RICHARD CONRAD                                 
                            RE - REHOBETH