List of geomagnetic reversals
The following is a list of geomagnetic reversals, showing the ages of the beginning and end of each period of normal polarity (where the polarity matches the current direction).
Source for the last 83 million years: Cande and Kent, 1995.[1]
Ages are in million years before present (mya).
| End/Top (mya) | Beginning/Base (mya) | Normal polarity |
Name |
|---|---|---|---|
| 0.000 | 0.780 | 1n | Brunhes–Matuyama |
| 0.990 | 1.070 | 1r.1n | Jaramillo |
| 1.770 | 1.950 | 2n | Olduvai |
| 2.140 | 2.150 | 2r.1n | |
| 2.581 | 3.040 | 2An.1n | Gauss–Matuyama |
| 3.110 | 3.220 | 2An.2n | |
| 3.330 | 3.580 | 2An.3n | Gauss/Gilbert |
| 4.180 | 4.290 | 3n.1n | Cochiti |
| 4.480 | 4.620 | 3n.2n | Nunivak |
| 4.800 | 4.890 | 3n.3n | Sidufjall |
| 4.980 | 5.230 | 3n.4n | Thvera |
| 5.894 | 6.137 | 3An.1n | |
| 6.269 | 6.567 | 3An.2n | |
| 6.935 | 7.091 | 3Bn | |
| 7.135 | 7.170 | 3Br.1n | |
| 7.341 | 7.375 | 3Br.2n | |
| 7.432 | 7.562 | 4n.1n | |
| 7.650 | 8.072 | 4n.2n | |
| 8.225 | 8.257 | 4r.1n | |
| 8.699 | 9.025 | 4An | |
| 9.230 | 9.308 | 4Ar.1n | |
| 9.580 | 9.642 | 4Ar.2n | |
| 9.740 | 9.880 | 5n.1n | |
| 9.920 | 10.949 | 5n.2n | |
| 11.052 | 11.099 | 5r.1n | |
| 11.476 | 11.531 | 5r.2n | |
| 11.935 | 12.078 | 5An.1n | |
| 12.184 | 12.401 | 5An.2n | |
| 12.678 | 12.708 | 5Ar.1n | |
| 12.775 | 12.819 | 5Ar.2n | |
| 12.991 | 13.139 | 5AAn | |
| 13.302 | 13.510 | 5ABn | |
| 13.703 | 14.076 | 5ACn | |
| 14.178 | 14.612 | 5ADn | |
| 14.800 | 14.888 | 5Bn.1n | |
| 15.034 | 15.155 | 5Bn.2n | |
| 16.014 | 16.293 | 5Cn.1n | |
| 16.327 | 16.488 | 5Cn.2n | |
| 16.556 | 16.726 | 5Cn.3n | |
| 17.277 | 17.615 | 5Dn | |
| 18.281 | 18.781 | 5En | |
| 19.048 | 20.131 | 6n | |
| 20.518 | 20.725 | 6An.1n | |
| 20.996 | 21.320 | 6An.2n | |
| 21.768 | 21.859 | 6AAn | |
| 22.151 | 22.248 | 6AAr.1n | |
| 22.459 | 22.493 | 6AAr.2n | |
| 22.588 | 22.750 | 6Bn.1n | |
| 22.804 | 23.069 | 6Bn.2n | |
| 23.353 | 23.535 | 6Cn.1n | |
| 23.677 | 23.800 | 6Cn.2n | |
| 23.999 | 24.118 | 6Cn.3n | |
| 24.730 | 24.781 | 7n.1n | |
| 24.835 | 25.183 | 7n.2n | |
| 25.496 | 25.648 | 7An | |
| 25.823 | 25.951 | 8n.1n | |
| 25.992 | 26.554 | 8n.2n | |
| 27.027 | 27.972 | 9n | |
| 28.283 | 28.512 | 10n.1n | |
| 28.578 | 28.745 | 10n.2n | |
| 29.401 | 29.662 | 11n.1n | |
| 29.765 | 30.098 | 11n.2n | |
| 30.479 | 30.939 | 12n | |
| 33.058 | 33.545 | 13n | |
| 34.655 | 34.940 | 15n | |
| 35.343 | 35.526 | 16n.1n | |
| 35.685 | 36.341 | 16n.2n | |
| 36.618 | 37.473 | 17n.1n | |
| 37.604 | 37.848 | 17n.2n | |
| 37.920 | 38.113 | 17n.3n | |
| 38.426 | 39.552 | 18n.1n | |
| 39.631 | 40.130 | 18n.2n | |
| 41.257 | 41.521 | 19n | |
| 42.536 | 43.789 | 20n | |
| 46.264 | 47.906 | 21n | |
| 49.037 | 49.714 | 22n | |
| 50.778 | 50.946 | 23n.1n | |
| 51.047 | 51.743 | 23n.2n | |
| 52.364 | 52.663 | 24n.1n | |
| 52.757 | 52.801 | 24n.2n | |
| 52.903 | 53.347 | 24n.3n | |
| 55.904 | 56.391 | 25n | |
| 57.554 | 57.911 | 26n | |
| 60.920 | 61.276 | 27n | |
| 62.499 | 63.634 | 28n | |
| 63.976 | 64.745 | 29n | |
| 65.578 | 67.610 | 30n | |
| 67.735 | 68.737 | 31n | |
| 71.071 | 71.338 | 32n.1n | |
| 71.587 | 73.004 | 32n.2n | |
| 73.291 | 73.374 | 32r.1n | |
| 73.619 | 79.075 | 33n | |
| 83.000 | 118.000 | 34n |
References
[edit]- ^ Cande, S.C., and D.V. Kent, Revised calibration of the geomagnetic polarity timescale for the late Cretaceous and Cenozoic, J. Geophys. Res., 100, 6,093–6,095, 1995.