Table 1 Summary of calculated U-Pb ages and their uncertainties.

From: The Late Triassic Ischigualasto Formation at Cerro Las Lajas (La Rioja, Argentina): fossil tetrapods, high-resolution chronostratigraphy, and faunal correlations

Sample

Formation

Height above base (m)

Latitude (S)

Longitude (W)

206Pb

date

Uncertainty (2σ)

MSWD

n

#

238U

X

Y

Z

LL041219-6

Ischigualasto

1035

29°28'43.29"

68°20'12.81"

221.82

0.10

0.12

0.27

0.63

4

7

LL041219-2

Ischigualasto

160

29°28'42.53"

68°20'57.64"

228.97

0.22

0.23

0.33

1.9

4

8

Toba-2

Ischigualasto

107

29°28'33.00"

68°21'1.04"

229.25

0.10

0.16

0.30

1.2

6

6

  1. Notes: Latitude/Longitude relative to WGS84 datum. X internal (analytical) uncertainty in the absence of all external or systematic errors. Y incorporates the U-Pb tracer calibration error. Z includes X and Y, as well as the uranium decay constant errors. MSWD mean square of weighted deviates. n number of analyses included in the calculated weighted mean date, out of a total number of # analyses.
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