Abstract:
Part of the NOAA Paleoclimatology Program dataset is the Barbados Sea Level
and Th/U 14C Calibration. Barbados data are from Fairbanks (1989) and Bard
et al. (1990) - the reference works below - or are new data not yet
deescribed in the reference documents. All 14C measurements were made in the
Lamont radiocarbon laboratory by Guy Mathieu unless otherwise indicated.
Data for Porities asteroides
... (Pa) samples from Barbados are listed, but
they are not used in the sea level reconstruction. The Porities asteroides
(Pa) data provide lower limits for sea level during the last glacial
maximum. Sample 12-30-2 is located below a subaerial exposure surface
capping an older reef. Data for other Caribbean islands are from the
compilation of Lighty et al. (1982). 14Cc kyr is the reservoir corrected
age computed by subtracting 0.4 kyr from the 14C age. Depth (m)c indicates
uplift corrected depth using a mean uplift rate of 34 cm/kyr
(Fairbanks,1989) and the 14Cc age. In the future, the corrected depth will
be based upon Th/U age estimates once the Th/U age dates are completed on
the remaining samples. Replicate 14C measurements were averaged for the
purpose of plotting the sea level curve and for estimating the uplift
correction of individual samples. The exceptions are samples 7-12-2, 7-13-
1, 9-27-5 which had initial age dates out of stratigraphic sequence. These
samples were redated and the new age dates are stratigraphically
consistent.
*14C measured at Geochron Lab., Cambridge, Massachusetts.
**14C measured at Gif-sur-Yvette, France by AMS (Bard et al., 1990).
***14C measured at ETH Zurich, Switzerland by AMS (Bard et al., 1990).
****14C measured at University of Arizona, Tuscon, Arizona by AMS.
Note:
E. Bard presented two regression equations to describe the relationship
between 14-C and Th/U ages at the 4th International Congress on
Paleoceanography (Kiel, 1992):
linear relationship:
'true age'=1.24(14-C age) - 840
polynomial relationship:
'true age'=-5.85x10^-6(14-C age)^2 + 1.39(14-C age) - 1807 
