| TABLE 1. Data for 14C age determinations for peat samples from core SB1c, St. Bernard Parish, Louisiana. | ||||||||
| St. Bernard core SB1c (location: 29o58"53' N, 89o55"27' W; sampled: 03/20/1996). | ||||||||
| Percent compaction (applied linearly): 29.1. | ||||||||
|
Corrected depth sample midpoint (cm)1 |
Original depth sample midpoint (cm) |
Lab I.D. (WW- nnn)2 |
Material |
Fraction modern3 |
Age (yr BP4 ± one standard deviation) |
d13C (parts per thousand) |
d13C lab5 |
|
| 43.7 | 31 | 685 | peat | 0.9704 | 240 | 60 | -20.0 | R |
| 69.1 | 49 | 746 | peat | 0.9732 | 220 | 60 | -20.5 | D |
| 84.6 | 60 | 747 | peat | 0.9595 | 330 | 60 | -21.9 | D |
| 84.6 | 60 | 748 | grass | 0.9734 | 220 | 50 | -15.9 | D |
| 105.8 | 75 | 748 | peat | 0.9334 | 550 | 50 | -20.0 | M |
| 126.9 | 90 | 750 | peat | 0.8976 | 870 | 60 | -20.1 | D |
| 166.4 | 118 | 751 | peat | 0.8672 | 1140 | 60 | -20.1 | D |
| 194.6 | 138 | 752 | peat | 0.8825 | 1000 | 60 | -20.2 | D |
| 235.5 | 167 | 753 | peat | 0.7875 | 1920 | 60 | -17.6 | D |
| 265.1 | 188 | 754 | peat | 0.7813 | 1980 | 50 | -21.5 | D |
| 304.6 | 216 | 755 | peat | 0.7459 | 2360 | 60 | -26.6 | D |
| 345.4 | 245 | 756 | peat | 0.7171 | 2670 | 50 | -27.8 | D |
| 345.4 | 245 | 757 | grass | 0.7212 | 2630 | 50 | -25.8 | D |
| 383.5 | 272 | 698 | peat | 0.6728 | 3180 | 50 | -25.9 | D |
| 396.2 | 281 | 802 | clay | 0.3507 | 8420 | 60 | -24.9 | D |
| 1Corrected depth equals original depth (midpoint of sample interval) multiplied by 1.41 to correct for compaction. | ||||||||
| 2 14C data are archived in a world-wide database indexed by U.S. Geological Survey laboratory I.D. numbers "WW-nnn" where "WW" indicates AMS ages. | ||||||||
| 3Ratio of the 14C activity of the sample to the activity of the modern standard, which is used in various calculations related to radiocarbon ages. | ||||||||
| 4 14C age determinations not calibrated to tree-ring ages and not corrected for 14C enrichment by seawater. | ||||||||
| 5R=Reston, VA; D=Denver, CO; M=Menlo Park, CA. | ||||||||
| Source: U.S. Geological Survey Open-File Report 98-36. Carbon storage and late Holocene chronostratigraphy of a Mississippi River deltaic marsh, St. Bernard Parish, Louisiana (H.W. Markewich, ed.). | ||||||||