Sample	% 39Ar	37Ar/39Ar	36Ar/39Ar	40Ar*/39Ar	% 40*Ar	Age (Ma)	SD
DMS87-26 (20)
1789-01		0.0612	0.00340	4.0970	80.3	10.527	0.444
1789-04B		0.0594	0.00246	4.2367	85.4	10.885	0.244
1789-08		0.0306	0.00100	4.4163	93.8	11.345	0.156
1789-10		0.1089	0.00715	4.4398	67.8	11.405	0.904
1789-04		0.0325	0.00076	4.6559	95.4	11.958	0.309
								Weighted Mean = 11.27 +/- 0.12 SE
1789-03		0.0251	0.02461	3.5761	33.0	9.192	1.038
1789-06		0.0415	0.00114	5.2939	94.0	13.590	0.577
1789-05		0.0159	0.00334	57.7469	98.3	142.987	0.478
1789-02		0.0254	0.00699	94.4336	97.9	228.273	0.679
1789-07		0.0391	0.00305	103.7365	99.1	249.273	0.521
1789-09		0.0415	0.00376	125.2737	99.1	296.973	0.570
1789-02B		0.0184	0.00276	125.6885	99.4	297.880	0.728
								Irradiation Data
							20	J=0.001428 +/- 0.000001
							41B	J=0.005920 +/- 0.000009
							61B	J=0.002783 +/- 0.000002
							61A2	J=0.002844 +/- 0.000004
							98A	J=0.000478 +/- 0.000001