Cosmogenic-nuclide measurements and stratigraphic info
Borehole 5-A-75
Key to drillhole logs
Be-10 and Al-26 in quartz
| | | Depth | | [Be-10] | | | | [Al-26] | | |
| Sample name | | (ft) | | (atoms/g) | | +/- | | (atoms/g) | | +/- |
| |
| 5-A-75-167A | | 166.75 | | 8.05E+04 | | 3.13E+03 | | 2.36E+05 | | 2.03E+04 |
| 5-A-75-167B | | 167.25 | | 7.68E+04 | | 2.68E+03 | | 2.29E+05 | | 1.32E+04 |
Bulk Be-10 in sediment
| | Depth | | [Be-10] | | |
Sample name | | (ft) | | (atoms/g) | | +/- |
| |
| 5-A-75-160 | | 160 | | 5.42E+07 | | 1.65E+06 |
| 5-A-75-163 | | 163 | | 5.72E+08 | | 1.88E+07 |
| 5-A-75-167B | | 167 | | 6.42E+07 | | 2.25E+06 |
| 5-A-75-171 | | 171 | | 3.51E+07 | | 1.27E+06 |
| 5-A-75-172 | | 172 | | 2.02E+06 | | 2.49E+05 |
Stratigraphy
Mass depths reflect the following density assumptions:
| What? | | Till | Glaciolacustrine | Sand | Loess | Silty sand | Gravelly sand |
| Density(g cm-3)
| | 2.25 | 2.06 | 2.13 | 2.18 | 2.06 | 2.49 |
These are averages derived from the density measurements here.
| Top depth | | Bottom depth | | Lithology | | Top depth | | Bottom depth | | Density | | Mass thickness | | Top mass depth | | Bottom mass depth |
| (ft) | | (ft) | | | | (m) | | (m) | | (g cm-3) | | of unit (g cm-2) | | (g cm-2) | | (g cm-2) |
| |
| 0 | | 7.5 | | LOESS | | 0.00 | | 2.29 | | 2.18 | | 499 | | 0 | | 499 |
| 7.5 | | 42 | | TILL | | 2.29 | | 12.80 | | 2.25 | | 2361 | | 499 | | 2860 |
| 42 | | 85 | | TILL | | 12.80 | | 25.91 | | 2.25 | | 2943 | | 2860 | | 5803 |
| 85 | | 159.5 | | TILL | | 25.91 | | 48.62 | | 2.25 | | 5098 | | 5803 | | 10901 |
| 159.5 | | 166.5 | | SLTSND | | 48.62 | | 50.75 | | 2.10 | | 448 | | 10901 | | 11349 |
| 166.5 | | 170 | | TILL | | 50.75 | | 51.82 | | 2.25 | | 240 | | 11349 | | 11589 |
| 170 | | 190 | | BR | | 51.82 | | 57.91- | | - | | - | | - | | |