Table T6. Normal polarity intervals for Cenozoic and Cretaceous periods.
Normal polarity interval age
(Ma)
Polarity chron
Reference
Top
Bottom
0.000 0.780 C1n Brunhes SBP90
0.990 1.070 C1r.1n Jaramillo SBP90
1.201 1.211 C1r.2n Cobb Mtn. SBP90
1.770 1.950 C2n Olduvai SBP90
2.140 2.150 C2r.1n Reunion CK95
2.581 3.040 C2An.1n Gauss SPB90/H91
3.110 3.220 C2An.2n H91
3.330 3.580 C2An.3n H91
4.180 4.290 C3n.1n Cochiti H91
4.480 4.620 C3n.2n Nunivak H91
4.800 4.890 C3n.3n Sidufjall H91
4.980 5.230 C3n.4n Thvera H91/SCHPS95
5.875 6.122 C3An.1n SCHPS95
6.256 6.555 C3An.2n SCHPS95
6.919 7.072 C3Bn SCHPS95
7.135 7.170 C3Br.1n SCHPS95
7.341 7.375 C3Br.2n SCHPS95
7.406 7.533 C4n.1n SCHPS95
7.618 8.027 C4n.2n SCHPS95
8.174 8.205 C4r.1n SCHPS95
8.631 8.945 C4An SCHPS95
9.142 9.218 C4Ar.1n SCHPS95
9.482 9.543 C4Ar.2n SCHPS95
9.639 9.880 C5n.1n SCHPS95
9.920 10.839 C5n.2n SCHPS95
10.943 10.991 C5r.1n SCHPS95
11.343 11.428 C5r.2n SCHPS95
11.841 11.988 C5An.1n SCHPS95
12.096 12.320 C5An.2n SCHPS95
12.605 12.637 C5Ar.1n SCHPS95
12.705 12.752 C5Ar.2n SCHPS95
12.929 13.083 C5AAn SCHPS95
13.252 13.466 C5ABn SCHPS95
13.666 14.053 C5ACn SCHPS95
14.159 14.607 C5ADn SCHPS95
14.800 14.888 C5Bn.1n SCHPS95/CK95
15.034 15.155 C5Bn.2n CK95
16.014 16.293 C5Cn.1n CK95
16.327 16.488 C5Cn.2n CK95
16.556 16.726 C5Cn.3n CK95
17.277 17.615 C5Dn CK95
18.281 18.781 C5En CK95
19.048 20.131 C6n CK95
20.518 20.725 C6An.1n CK95
20.996 21.320 C6An.2n CK95
21.768 21.859 C6AAn CK95
22.151 22.248 C6AAr.1n CK95
22.459 22.493 C6AAr.2n CK95
22.588 22.750 C6Bn.1n CK95
22.804 23.069 C6Bn.2n CK95
23.353 23.535 C6Cn.1n CK95
23.677 23.800 C6Cn.2n CK95
23.999 24.118 C6Cn.3n CK95
24.730 24.781 C7n.1n CK95
24.835 25.183 C7n.2n CK95
25.496 25.648 C7An CK95
25.823 25.951 C8n.1n CK95
25.992 26.554 C8n.2n CK95
27.027 27.972 C9n CK95
28.283 28.512 C10n.1n CK95
28.578 28.745 C10n.2n CK95
29.401 29.662 C11n.1n CK95
29.765 30.098 C11n.2n CK95
30.479 30.939 C12n CK95
33.058 33.545 C13n CK95
34.655 34.940 C15n CK95
35.343 35.526 C16n.1n CK95
35.685 36.341 C16n.2n CK95
36.618 37.473 C17n.1n CK95
37.604 37.848 C17n.2n CK95
37.920 38.113 C17n.3n CK95
38.426 39.552 C18n.1n CK95
39.631 40.130 C18n.2n CK95
41.257 41.521 C19n CK95
42.536 43.789 C20n CK95
46.264 47.906 C21n CK95
49.037 49.714 C22n CK95
50.778 50.946 C23n.1n CK95
51.047 51.743 C23n.2n CK95
52.364 52.663 C24n.1n CK95
52.757 52.801 C24n.2n CK95
52.903 53.347 C24n.3n CK95
55.904 56.391 C25n CK95
57.554 57.911 C26n CK95
60.920 61.276 C27n CK95
62.499 63.634 C28n CK95
63.976 64.745 C29n CK95
65.578 67.519 C30n G95
67.640 68.657 C31n G95
70.969 71.314 C32n.1n G95
71.643 73.635 C32n.2n G95
74.021 74.133 C32r.1n G95
74.470 79.650 C33n G95
83.500 120.396 C34n G95
121.000 123.673 M1n G95
124.051 124.721 M3n G95
126.723 127.669 M5n G95
128.176 128.313 M6n G95
128.425 128.580 M7n G95
128.966 129.276 M8n G95
129.508 129.774 M9n G95
130.221 130.556 M10n G95
130.874 131.201 M10Nn.1n G95
131.252 131.570 M10Nn.2n G95
131.588 131.880 M10Nn.3n G95
132.069 132.679 M11n G95
133.025 133.060 M11r.1n G95
133.350 133.627 M11An.1n G95
133.641 133.911 M11An.2n G95
133.988 134.216 M12n G95
134.777 134.846 M12r.1n G95
134.999 135.248 M12An G95
135.338 135.525 M13n G95
135.843 136.044 M14n G95
136.675 137.222 M15n G95
137.877 139.631 M16n G95
140.335 140.790 M17n G95
142.404 143.021 M18n G95
143.476 143.616 M19n.1n G95
143.703 144.691 M19n.2n G95

Notes: SBP90 = Shackleton et al. (1990), H91 = Hilgen (1991a, 1991b), SCHPS95 = Shackleton et al. (1995), CK95 = Cande and Kent (1995), G95 = Gradstein et al. (1995).