| Flow Date | Sample | K2O (wt%) |
40K (ppm) |
40Ar* (ppm)x10-4 |
40Ar* (%) | 40Ar* Total40Ar |
Total 40Ar (ppm) |
40Ar 36Ar | 36Ar(ppm) x10-5 | 40Ar* 40K |
Model Age (Ma) |
Uncertainty (Ma) (one sigma) |
| February 11, 1949 | A B |
1.066 1.057 |
1.272 1.261 |
<0.2 0.75 |
- 3.75 |
- 0.0375 |
- 0.0020 |
296 310 | - 0.645 |
<0.000016 0.000059 | <0.27 1.0 |
- 0.2 |
| June 4, 1954 |
A B |
1.034 1.087 |
1.234 1.297 |
<0.2 1.10 |
- 3.00 |
- 0.030 |
- 0.00367 |
288 308 |
- 1.192 |
<0.000016 0.000085 | <0.27 1.5 |
- 0.1 |
| June 30, 1954 |
A#1 A#2 B#1 B#2 C |
1.074 0.977 0.944 0.995 1.097 |
1.281 1.166 1.126 1.186 1.308 |
<0.2 0.87 2.28 0.56 0.93 |
- 2.75 4.05 1.70 3.75 |
- 0.0275 0.0405 0.017 0.0375 |
- 0.00316 0.00691 0.00329 0.00248 |
285 306 311 304 311 |
- 1.033 2.222 1.082 0.798 |
<0.000016 0.000075 0.000202 0.000047 0.000071 | <0.27 1.3 3.5 0.8 1.2 |
- 0.3 0.2 0.2 0.2 |
| July 14, 1954 |
A B |
1.033 1.004 |
1.232 1.198 |
0.69 <0.2 |
3.40 - |
0.034 - |
0.00203 - |
301 283 |
0.675 - |
0.000056 <0.000017 | 1.0 <0.29 |
0.2 - |
| February 19, 1975 | A B |
1.128 1.048 |
1.346 1.250 |
0.79 <0.2 |
2.55 - |
0.0255 - |
0.00310 - |
307 291 |
1.010 - |
0.000059 <0.000016 | 1.0 <0.27 |
0.2 - |