Figure 5. Latitude dependence of
S for various geomagnetic field regimes.
Intervals of frequent reversals: (a) 10-0 Ma;
(b) 45-15 Ma; (c) 554-365 Ma; (d) averages for intervals (a)-(c).
Intervals of predominant normal
polarity: (e) 115-85 Ma; (f) 1040-1000, 1200-1150, and 1620-1580 Ma.
Intervals of predominant reversed
polarity: (g) 300-255 Ma; (h) 980-910 and 1500-1400 Ma;
(i) Averages for stable field states (e)-(h).
Circles, upside-down triangles, triangles, and squares are, respectively,
IPR
0.2, 0.2
< IPR
< 0.4, 0.4
IPR
< 0.6,
and IPR
0.6. Open, Solid, and circled symbols correspond to the number
of determinations of less than 5, 5-10, and more than 10. Vertical bars
are standard deviations.