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Table 3 Summary of the early to middle Miocene paleomagnetic directions of the Mizunami-Kani and Izumo areas

From: Timing of clockwise rotation of Southwest Japan: constraints from new middle Miocene paleomagnetic results

  Age N D I α 95 R ΔR Ref.
(Ma)   (°) (°) (°) (°) (°)  
Mizunami-Kani         
 Oidawara F 15.8–15.7 19 10.5 41.1 7.0 4.8 9.8 1
 Akeyo F 18.1–17.5 19 49.9 51.9 5.8 44.2 9.9 2, 3, 4
 Hachiya F (site HCY5)* 22.2 (6) 28.7 57.6 7.5 23.0 13.0 5
 Hachiya F (site HCY4)* 22.2 (6) 53.8 60.5 12.5 48.1 21.8 5
Izumo         
 Omori F (site 08120205)* 14.6 ± 0.8 (4) 344.4 49.4 8.5 −22.1 12.2 6
 Kawai F (site 08122002)* 15.4 ± 0.6 (3) 355.5 43.4 11.6 −10.0 14.3 6
 Hata F 18–15 6 3.5 42.9 9.9 −2.0 12.5 6
 Daito F (site DT-1)* 16.3 ± 1.2 (5) 19.6 32.6 7.5 14.1 9.5 6
 Yoshida PC (site YS-1)* 16.4 ± 0.4 (4) 10.2 53.4 9.3 4.7 14.1 6
 Sada F 22–18 6 52.5 43.2 13.1 47.0 15.8 6
  1. Data with asterisks are site-mean directions of igneous rocks
  2. N number of sites (number of samples in parentheses), D declination, I inclination, α95 radius of 95 % confidence cone, R angle of rotation with respect to the North China Block (positive for an observed direction clockwise from the expected direction), ΔR 95 % confidence limit of R, calculated after Demarest (1983), F formation, PC plutonic complex. References: 1 this study, 2 Hayashida (1986), 3 Hiroki and Matsumoto (1999), 4 Itoh et al. (2006), 5 Hayashida et al. (1991), 6 Sawada et al. (2013)