Table 2

 

 

 

 

 

 

 

 

 

 

 

Location

Location 

CAI

Size Fraction (µm)

d18O

(SMOW)

 

Rb      (ppm)

K/Rb

% K2O   (wt %)

*40 Ar rad.

(%)

*40 Ar nmole g-1

K-Ar age (Ma)

 

Alexander Gap (Deicke)

1

3.5-4.0

1-2

 

165

346

6.90

93.1

3.225

299 ± 4

 

Alexander Gap (Deicke)

1

3.5-4.0

<0.25

19.0

169

339

6.99

94.4

3.054

281 ± 4

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (Deicke)

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne  (base)

2

2.5-3.0

1-2

 

 

 

7.87

99.8

3.491

284 ± 4

 

Fort Payne  (base)

2

2.5-3.0

< 0.25

22.4

138

444

7.38

95.6

3.125

 273 ± 6*

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (+14 inches from base)

2

2.5-3.0

1-2

 

 

 

8.01

97.0

3.434

275 ± 4

 

Fort Payne (+14 inches from base)

2

2.5-3.0

< 0.25

23.0

141

441

7.49

97.7

3.174

 273 ± 6*

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (7-15 inches from base)

2

2.5-3.0

1-2

 

 

 

7.27

94.9

3.294

291 ± 4

 

Fort Payne (7-15 inches from base)

2

2.5-3.0

1-2

 

 

 

9.12

95.4

3.247

231 ± 3

 

Fort Payne (7-15 inches from base)

2

2.5-3.0

< 0.25

 

 

 

7.06

94.5

3.169

288 ± 4

 

Fort Payne (7-15 inches from base)

2

2.5-3.0

< 0.25

 

 

 

7.46

95.9

3.079

266 ± 4

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (15-22 inches from base)

2

2.5-3.0

1-2

 

 

 

7.83

95.7

3.321

273 ± 4

 

Fort Payne (15-22 inches from base)

2

2.5-3.0

< 0.25

 

 

 

7.78

95.7

3.224

267 ± 4

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (22-30 inches from base)

2

2.5-3.0

1-2

 

 

 

7.90

96.4

3.253

266 ± 4

 

Fort Payne (22-30 inches from base)

2

2.5-3.0

< 0.25

 

 

 

7.73

96.3

2.971

250 ± 4

 

 

 

 

 

 

 

 

 

 

 

 

 

Fort Payne (30-38 inches from base)

2

2.5-3.0

1-2

 

 

 

7.73

96.9

3.191

266 ± 4

 

Fort Payne (30-38 inches from base)

2

2.5-3.0

< 0.25

 

 

 

7.61

96.6

3.213

272 ± 4

 

 

 

 

 

 

 

 

 

 

 

 

 

Rising Fawn (Bays Formation)

3

2.5-3.0

1-2

 

 

 

6.58

98.9

4.604

431 ± 5

 

Rising Fawn (Bays Formation)

3

2.5-3.0

< 0.25

 

212

258

6.64

96.2

3.749

354 ± 5

 

 

 

 

 

 

 

 

 

 

 

 

 

Trenton (Deicke)

4

2.5-3.0

1-2

 

92

505

5.60

97.4

2.446

281 ± 4

 

Trenton (Deicke)

4

2.5-3.0

< 0.25

23.2

116

383

5.35

93.9

2.237

 269 ± 6*