tivity on the carmel faul

Sample name 230/238 err 234/238 err 232/238 err 230/232 err Det. Age (y) + - Type
DN-48 post 0.23447 0.00162 1.07019 0.00201 0.002970 0.000008 81.34 0.56 n 26820 203 203 A
DN-48 pre 0.24684 0.00226 1.06698 0.00153 0.005485 0.000023 46.27 0.45 n 28534 296 296 A
DN-45 pre 0.23951 0.00821 1.01720 0.00139 0.030836 0.000254 7.89 0.28 y 29176 1154 1142 A
DN-63-post 0.26090 0.00174 1.08810 0.00131 0.004805 0.000012 81.12 0.56 n 29701 225 225 A
DN-37a-pre 0.26652 0.00165 1.07969 0.00213 0.001866 0.000004 145.54 0.84 n 30719 211 211 D
DN-21pre-I 0.27880 0.00289 1.07807 0.00197 0.005144 0.000013 55.60 0.57 y 32420 387 386 C
230
Th/U Age = 29.1 ±3.3 ka
1.12
data-point error ellipses are 2σ
Initial 234 U/ 238 U = 1.095 ±0.044
MSWD = 220, probability = 0.000
1.10
1.08
234 U/
238 U
1.06
1.04
1.02
1.00
0.22 0.24 0.26 0.28 0.30
230 Th/ 238 U
Figure 26: 29ka sample age cluster; 1. Sample isotopic ratio data table (red-pre samples, black-post
samples). 2. Isochron plot and age calculation (red crosses-uncorrected ages, green crossesprojected
data points). 3. Distribution of cluster samples in Denya Cave (red dots).
A cluster of age at ca. 29ka is shown in Figure 26. This age is based on five different
seismite samples, three of which are type A (Fig. 27). The age is a well constrained
because it is based on pre- and post seismite samples DN-48 (type B) (Fig. 27). Any other
evidence can be seen
pre
30.72ka
DN-45
as corroborative.
A-1
D-1
pre
29.18ka
DN-37
pre I
32.42ka
DN-63
post
29.7ka
post
26.83ka
C-1
A-5
pre
28.53ka
B-1
Figure 27: Age cluster
~ 29ka samples.
59