UMRB-1

Cosmogenic-nuclide measurements and stratigraphic info
Borehole SWRA-3

Key to drillhole logs

Be-10 and Al-26 in quartz

	Depth	[Be-10]		[Al-26]
Sample name	(ft)	(atoms/g)	+/-	(atoms/g)	+/-

SWRA-3-196	196	6.74E+04	1.92E+03	1.84E+05	1.54E+04
SWRA-3-205	205	6.45E+04	1.91E+03	1.90E+05	1.25E+04
SWRA-3-241	241	6.50E+04	1.87E+03	1.45E+05	1.05E+04

Bulk Be-10 in sediment

	Depth	[Be-10]
Sample name	(ft)	(atoms/g)	+/-

SWRA-3-188	188	1.85E+07	4.75E+05
SWRA-3-193	193	1.49E+07	3.87E+05
SWRA-3-228	228	2.86E+07	7.24E+05
SWRA-3-258	258	1.21E+08	1.67E+06

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	2.5	LOESS	0.00	0.76	1.70	130	0	130
2.5	25	TILL	0.76	7.62	2.25	1540	130	1669
25	36	GL	7.62	10.97	2.06	690	1669	2360
36	71	TILL	10.97	21.64	2.25	2395	2360	4755
71	120	TILL	21.64	36.58	2.25	3353	4755	8108
120	132	TILL	36.58	40.23	2.25	821	8108	8929
132	136	GL	40.23	41.45	2.06	251	8929	9180
136	165	TILL	41.45	50.29	2.25	1985	9180	11165
165	185	TILL	50.29	56.39	2.25	1369	11165	12534
185	195	TILL	56.39	59.44	2.20	671	12534	13204
195	208	SAND	59.44	63.40	2.13	844	13204	14048
208	226	GL	63.40	68.88	2.06	1129	14048	15178
226	231	TILL	68.88	70.41	2.27	346	15178	15524
231	249	SLTSND	70.41	75.90	2.17	1191	15524	16714
249	269	TILL	75.90	81.99	2.20	1341	16714	18055
269	295	TILL	81.99	89.92	2.25	1779	18055	19835

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