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Science 9 November 2001:
Vol. 294. no. 5545, pp. 1328 - 1331
DOI: 10.1126/science.1063678


Abstract
Full Text 		Centennial-Scale Holocene Climate Variability Revealed by a High-Resolution Speleothem name18 O Record from SW Ireland
Frank McDermott, David P. Mattey, and Chris Hawkesworth

Supplementary Material

Supplemental Table 1. Mass-spectrometric U-Th age data for speleothem CC3. Decay constants used to calculate activity ratios from measured atomic ratios are as follows; name238U = 1.551E-10, name234U = 2.835E-6, name230Th = 9.195E-6, name232Th = 4.948E-11. Age uncertainties are reported at the 1name level. (230Th/234U)c denotes (230Th /234U) ratios that have been corrected for detrital contamination using a (230Th/232Th) ratio of 1.5 for the detrital component. Because most samples have high (230Th/232Th) ratios the correction has a negligible effect on the calculated ages. Isotope ratios were measured using a MAT262 RPQII mass-spectrometer after ion exchange chromatography. Uranium and thorium isotopes were measured relative to a mixed 229Th-236U spike. Within-run precision for the U-series ages is typically ±1.5% at the 2name level. CC, Crag Cave, Ireland.
Sample no.Distance from tip (mm)238U (ppm)(234U/238U)230Th (pg/g)(230Th/230Th)(230Th/234U)cAge (ky)
CC3 34344.3320.94930.8631220.01111.22 ± 0.02
CC3 55554.0200.95191.4561400.02062.27± 0.03
CC3 95957.4240.9595.44413070.04635.16 ± 0.04
CC3 1001007.0571.0025.6575540.04775.31 ± 0.04
CC3 1461467.1990.95395.9445350.05155.76 ± 0.04
CC3 193.5193.54.4960.95084.5001740.05886.59 ± 0.05
CC3 2292295.0680.94835.6592440.06777.62 ± 0.06
CC3 2502508.4270.95479.59922590.07278.21 ± 0.06
CC3 26126111.3510.949313.10521180.07418.37 ± 0.06
CC3 3023024.7410.9815.9585080.07628.62 ± 0.06
CC3 40040010.2840.963913.11089200.08109.19 ± 0.07
CC3 4504504.0260.98615.46622720.08399.53 ± 0.07
CC3 4654652.0410.97122.88576290.089110.15 ± 0.07

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Science. ISSN 0036-8075 (print), 1095-9203 (online)