Table T18. Polarity zonation, Holes U1304A, U1304B, and U1304C.
| Polarity chron interpretation |
Age (Ma) |
Interval | Hole U1304A | Hole U1304B | Hole U1304D | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Core, section, interval (cm) |
Depth (mbsf) | Depth (mcd) | Core, section, interval (cm) |
Depth (mbsf) | Depth (mcd) | Core, section, interval (cm) |
Depth (mbsf) | Depth (mcd) | |||
| 303-U1304A- | 303-U1304B- | 303-U1304D- | |||||||||
| C1n (b) Matuyama/Brunhes | 0.78 | Upper | 13H-5, 30 | 120.30 | 138.42 | 14H-1, 80 | 123.0 | 138.08 | 8H-4, 80 | 123.8 | 138.53 |
| Lower | 13H-6, 15 | 121.65 | 139.77 | 14H-2, 55 | 124.25 | 139.38 | 8H-5, 80 | 125.3 | 140.03 | ||
| C1r.1n (t) Jaramillo | 0.99 | Upper | 15H-7, 50 | 142.5 | 162.46 | 16H-4, 70 | 146.41 | 163.32 | |||
| Lower | 16H-2, 75 | 144.75 | 165.77 | 16H-5, 100 | 148.22 | 165.18 | |||||
| C1r.1n (b) Jaramillo | 1.07 | Upper | 17H-5, 40 | 157.14 | 175.60 | 12H-2, 65 | 158.65 | 176.04 | |||
| Lower | 17H-6, 10 | 157.37 | 176.83 | 12H-3, 25 | 159.7 | 177.14 | |||||
| (t) Cobb Mountain | 1.19 | Upper | 18H-2, 80 | 163.79 | 187.21 | 18H-6, 65 | 168.33 | 187.34 | 13H-2, 60 | 168.10 | 187.05 |
| Lower | 18H-3, 40 | 164.9 | 188.31 | 18H-6, 140 | 169.08 | 188.09 | 13H-3, 105 | 170.05 | 189.00 | ||
| (b) Cobb Mountain | 1.215 | Upper | 18H-4, 10 | 166.10 | 189.51 | 13H-4, 10 | 170.6 | 189.55 | |||
| Lower | 18H-5, 70 | 168.2 | 191.61 | 13H-6, 130 | 174.8 | 193.75 | |||||
| C2n (t) Olduvai | 1.77 | Upper | 26H-2, 145 | 232.45 | 261.34 | 26H-2, 135 | 236.55 | 262.24 | 20H-3, 35 | 231.75 | 257.67 |
| Lower | 26H-4, 30 | 234.3 | 263.19 | 26H-3, 110 | 237.8 | 263.49 | 21H-1, 80 | 235.2 | 264.59 | ||
Note: (b) = bottom, (t) = top.
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