Cosmogenic-nuclide measurements and stratigraphic info

Borehole 4-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) +/-
4-A-75-107 107 1.80E+05 5.37E+03 6.56E+05 2.33E+04

Bulk Be-10 in sediment

Depth [Be-10]
Sample name (ft) (atoms/g) +/-
4-A-75-33 33 1.62E+08 5.09E+06
4-A-75-83 83 8.62E+08 2.64E+07
4-A-75-83B 83 9.42E+08 2.90E+07
4-A-75-116 116 5.96E+07 2.89E+06
4-A-75-155 155 6.30E+07 2.24E+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 31.5 TILL 0.00 9.60 2.25 2156 0 2156
31.5 60 TILL 9.60 18.29 2.25 1950 2156 4106
60 80 SLTSND 18.29 24.38 2.06 1255 4106 5361
80 100 TILL 24.38 30.48 2.25 1369 5361 6730
100 110 SAND 30.48 33.53 2.13 650 6730 7380
110 130 TILL 33.53 39.62 2.25 1369 7380 8749
130 134 SAND 39.62 40.84 2.13 260 8749 9009
134 236.5 TILL 40.84 72.09 2.25 7015 9009 16023
236.5 240 BR 72.09 73.15- - - -