Sample %³⁹Ar ³⁷Ar/³⁹Ar ³⁶Ar/³⁹Ar ⁴⁰Ar^*/³⁹Ar %⁴⁰Ar^* Age (Ma) SD

DMS96-25D

18

22

16

15

23

21

19

12

08

24

09

06

04

11

02

01

20

17

05

07

03

10

13

0.0297	0.6573	9.376	98.0	13.38	0.34
0.0170	0.9164	9.480	97.2	13.42	0.25
0.0166	0.2511	9.301	99.2	13.44	0.19
0.0235	0.8172	9.480	97.5	13.46	0.50
0.0799	1.320	9.682	96.0	13.54	0.37
0.0504	0.4054	9.431	98.8	13.57	0.33
0.0145	0.3837	9.440	98.8	13.59	0.45
0.0565	8.467	11.83	78.9	13.59	0.45
0.0421	0.4599	9.499	98.6	13.64	0.57
0.0269	0.4095	9.496	98.7	13.66	0.76
0.0062	0.2408	9.476	99.3	13.70	0.19
0.0134	0.5490	9.567	98.3	13.70	0.33
0.0159	2.953	10.29	91.5	13.72	0.24
0.0093	0.2350	9.492	99.3	13.73	0.61
0.0151	1.582	9.907	95.3	13.75	0.37
0.0546	0.7170	9.651	97.8	13.76	0.19
0.0149	-0.0925	9.425	100.3	13.77	0.29
0.0188	2.354	10.15	93.2	13.78	0.45
0.0475	0.6270	9.643	98.1	13.78	0.24
0.0137	1.410	9.894	95.8	13.81	0.51
0.0122	4.890	10.94	86.8	13.84	0.27
0.0111	0.3537	9.663	98.9	13.92	0.29
0.1462	4.122	10.94	89.0	14.18	0.78

Weighted Mean = 27.9 ±36.8

Plateau Age = 13.664 ±0.096

Irradiation Data

(39Ar/37Ar)Ca = 0.00070±0.00005

(36Ar/37Ar)Ca = 0.00026±0.00002

(38Ar/39Ar)K = 0.0119

(40Ar/39Ar)K = 0.0002±0.0003