Skip to main content

Table 1 Stratigraphic positions for the polarity reversal horizons

From: Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications

Polarity boundary Transitional zone Mid-thickness (m) Age (Ma)
Top (m) Bottom (m)
Mammoth top 309.7 305.95 307.83 3.207
Mammoth bottom 298 294.1 296.05 3.330
Gilbert–Gauss 223.7 222.45 223.08 3.596
Cochiti top 70.1 64.2 67.15 4.187
Cochiti bottom 55.4 50.75 53.08 4.300
Nunivak top 10.1 9.9 10 4.493