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Cosmogenic-nuclide measurements and stratigraphic info

Borehole UMRB-2

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Key to drillhole logs

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Be-10 and Al-26 in quartz

		Depth		[Be-10]				[Al-26]
Sample name		(ft)		(atoms/g)		+/-		(atoms/g)		+/-
UMRB-2-149		149		5.30E+04		1.57E+03		1.76E+05		2.29E+04
UMRB-2-185		185		6.15E+04		2.40E+03		2.40E+05		1.71E+04
UMRB-2-207		207		4.81E+04		1.78E+03		1.85E+05		5.74E+04
UMRB-2-209		209		4.38E+04		2.28E+03		1.70E+05		1.39E+04
UMRB-2-168		168		6.31E+04		1.78E+03		2.58E+05		1.67E+04
UMRB-2-201F		201		4.07E+04		1.53E+03		2.06E+05		1.81E+04

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Bulk Be-10 in sediment

		Depth		[Be-10]
Sample name		(ft)		(atoms/g)		+/-
UMRB-2-19		19		1.38E+07		3.63E+05
UMRB-2-39		39		1.43E+07		3.76E+05
UMRB-2-111		111		9.92E+06		2.69E+05
UMRB-2-133		133		9.12E+06		2.51E+05
UMRB-2-140		140		9.73E+06		2.66E+05
UMRB-2-146		146		9.46E+06		2.59E+05
UMRB-2-164		164		8.99E+06		2.48E+05
UMRB-2-182		182		1.23E+07		3.54E+05
UMRB-2-194		194		4.61E+06		1.46E+05

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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		5		GL		0.00		1.52		1.95		297		0		297
5		25		TILL		1.52		7.62		2.27		1384		297		1681
25		45		TILL		7.62		13.72		2.24		1366		1681		3046
45		96		GL		13.72		29.26		2.06		3200		3046		6246
96		117		TILL		29.26		35.66		2.09		1338		6246		7584
117		130		TILL		35.66		39.62		2.15		852		7584		8436
130		132		LOESS		39.62		40.23		2.18		133		8436		8569
132		135		GL		40.23		41.15		2.15		197		8569		8766
135		137		GRVSND		41.15		41.76		2.49		152		8766		8918
137		141		TILL		41.76		42.98		2.26		276		8918		9193
141		142		GL		42.98		43.28		2.06		63		9193		9256
142		149		TILL		43.28		45.42		2.31		493		9256		9749
149		153		SAND		45.42		46.63		2.13		260		9749		10009
153		165		TILL		46.63		50.29		2.22		812		10009		10821
165		175		SAND		50.29		53.34		2.13		650		10821		11471
175		184		TILL		53.34		56.08		2.17		595		11471		12066
184		193		GRVSND		56.08		58.83		2.49		684		12066		12751
193		196		TILL		58.83		59.74		2.25		205		12751		12956
196		200		TILL		59.74		60.96		2.25		274		12956		13230
200		203		SAND		60.96		61.87		2.04		187		13230		13416
203		207		SAND		61.87		63.09		2.13		260		13416		13676
207		223		SAND		63.09		67.97		2.13		1040		13676		14717
223		225		SLTSND		67.97		68.58		2.06		125		14717		14842

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