Cosmogenic-nuclide measurements and stratigraphic info

Borehole 17-A-76

Key to drillhole logs

 Be-10 and Al-26 in quartz

Depth [Be-10] [Al-26]
Sample name (ft) (atoms/g) +/- (atoms/g) +/-
17-A-76-130 130 6.28E+04 2.38E+03 2.22E+05 1.51E+04
17-A-76-146 146 1.42E+05 4.95E+03 3.93E+05 2.74E+04
17-A-76-146F 146 1.55E+05 5.39E+03 4.15E+05 2.90E+04

Bulk Be-10 in sediment

Depth [Be-10]
Sample name (ft) (atoms/g) +/-
17-A-76-121 121 7.01E+07 2.28E+06
17-A-76-150 150 1.01E+08 3.11E+06

Stratigraphy

Mass depths reflect the following density assumptions:

What?TillGlaciolacustrineSandLoessSilty sandGravelly sand
Density(g cm-3) 2.252.062.132.182.062.49

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 12.5 LOESS 0.00 3.81 2.18 832 0 832
12.5 28 TILL 3.81 8.53 2.25 1061 832 1892
28 37.5 SLTSND 8.53 11.43 2.10 608 1892 2501
37.5 41 TILL 11.43 12.50 2.25 240 2501 2740
41 87.5 TILL 12.50 26.67 2.25 3182 2740 5922
87.5 121.5 TILL 26.67 37.03 2.25 2327 5922 8249
121.5 137 SAND 37.03 41.76 2.13 1008 8249 9257
137 177 TILL 41.76 53.95 2.25 2737 9257 11994
177 180 BR 53.95 54.86- - - -