Austin Fm.

M

Ig total (μR/h)

k (%)

U (ppm)

Th (ppm)

Th/U

Range

Av.

SD

Range

Av.

SD

Range

Av.

SD

Range

Av.

SD

Av.

N = 12

4 - 4.4

4.20

0.2

0.9 - 1.0

0.9

0.01

2.1 - 2.2

2.15

0.07

3.9 - 5.6

4.75

1.2

3.7

Eagle Ford Fm.

N = 10

4 - 5

4.32

0.3

0.8 - 1.3

0.93

0.15

1 - 3

2.10

0.5

4.1 - 7.1

5.40

1.0

2.8

Washita Group

N = 29

3.4 - 5.5

4.42

0.4

0.6 - 1.1

0.87

0.1

0.5 - 3.5

2.10

0.7

4.3 - 8.1

5.70

1.0

3.2

Kiamichi Fm.

N = 9

3.5 - 4.7

4.26

0.3

0.6 - 0.9

0.74

0.1

1.7 - 3.4

2.44

0.5

3.6 - 7.6

5.27

1.2

2.3

Aurora Fm.

N = 39

3 - 4.9

3.40

0.4

0.5 - 1.1

0.64

0.1

0.2 - 3.7

1.78

0.6

2.9 - 8.7

4.58

1.4

3.6

La Peña Fm.

N = 7

3.8 - 4.8

4.37

0.3

0.7 - 1.0

0.8

0.1

0.7 - 3.5

2.37

1

3.3 - 7.5

5.60

1.5

3.4

Cupido Fm.

N = 34

3.7 - 5.5

4.20

0.4

0.4 - 1.8

0.86

0.2

1.1 - 3.5

2.28

0.5

3.6 - 7.8

5.15

1.1

2.4

Taraise Fm.

N = 5

3.7 - 4.4

4.12

0.3

0.6 - 1.0

0.84

0.1

1.2 - 3.1

2.42

0.7

2.8 - 5.6

4.40

1.1

2.1