Table T10. Determinations of polarity chron boundaries, Site 1236.
Polarity interval
Core, section, interval (cm)
Depth
Comments
Core, section, interval (cm)
Depth
Core, section, interval (cm)
Depth
Polarity chron interpretation
Age
(Ma)
(mbsf)
(mcd)
(mbsf)
(mcd)
(mbsf)
(mcd)

202-1236A-


202-1236B-

202-1236C-



Upper 1H-2, 80 2.30 2.33 Poorly defined 1H-2, 40 1.91 1.91


C1n (b) Matuyama/Brunhes
Middle 1H-2, 100 2.50 2.53
1H-2, 75 2.26 2.26


C1n (b) Matuyama/Brunhes 0.780
Lower 1H-2, 115 2.65 2.68
1H-2, 110 2.61 2.61


C1n (b) Matuyama/Brunhes
Upper 1H-2, 140 2.90 2.93 At section break 1H-3, 10 3.12 3.12


C1r.1n (t) Jaramillo
Middle 1H-3, 15 3.16 3.19
1H-3, 25 3.27 3.27


C1r.1n (t) Jaramillo 0.990
Lower 1H-3, 25 3.26 3.29
1H-3, 40 3.42 3.42


C1r.1n (t) Jaramillo
Upper 1H-3, 105 4.06 4.09
1H-3, 50 3.52 3.52


C1r.1n (b) Jaramillo
Middle 1H-3, 115 4.16 4.19
1H-3, 60 3.62 3.62


C1r.1n (b) Jaramillo 1.070
Lower 1H-3, 125 4.26 4.29 Near core bottom 1H-3, 85 3.87 3.87


C1r.1n (b) Jaramillo
Upper



1H-4, 120 5.73 5.73 1H-2, 30 4.61 5.17 C2n (t) Olduvai
Middle



1H-5, 20 6.24 6.24 1H-2, 105 5.36 5.92 C2n (t) Olduvai 1.770
Lower



1H-5, 70 6.74 6.74 1H-3, 35 6.17 6.73 C2n (t) Olduvai
Upper 2H-1, 110 5.70 7.51
1H-5, 105 7.09 7.09 1H-3, 120 7.02 7.58 C2n (b) Olduvai
Middle 2H-1, 125 5.85 7.66
1H-5, 140 7.44 7.44 1H-4, 10 7.43 7.99 C2n (b) Olduvai 1.950
Lower 2H-1, 140 6.00 7.81
1H-6, 25 7.80 7.80 1H-4, 35 7.68 8.24 C2n (b) Olduvai
Upper 2H-4, 30 9.43 11.24
2H-2, 30 10.61 10.88 1H-5, 30 9.14 9.70 C2An.1n (t) Gauss/Matuyama
Middle 2H-4, 65 9.78 11.59
2H-2, 60 10.91 11.18 1H-5, 115 9.99 10.55 C2An.1n (t) Gauss/Matuyama 2.581
Lower 2H-4, 105 10.18 11.99
2H-2, 90 11.21 11.48 1H-6, 50 10.85 11.41 C2An.1n (t) Gauss/Matuyama

Note: (b) = bottom, (t) = top.