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Progress in Earth and Planetary Science
Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

From: A paleomagnetic record of the early Matuyama chron including the Réunion subchron and the onset Olduvai boundary: High-resolution magnetostratigraphy and insights from transitional geomagnetic fields

Fig. 1

Location map of this study sites. a Location of the Japanese archipelago. The tectonic setting is drawn after Tatsumi et al. (2016). b Distribution of the Awa Group, the Chikura Group, and the Kazusa Group, which are Miocene-Pleistocene marine successions on the Boso Peninsula based on Mitsunashi and Suda (1980), Unozawa et al. (1983), and Kawakami and Shishikura (2006). c Chronological positions for the last 5 Ma of the Awa Group, the Chikura, and the Kazusa Group associated with the magnetostratigraphy. d Geologic map of the southernmost part of the Boso Peninsula, modified from Kawakami and Shishikura (2006). e Stratigraphic correlation of the Chikura Group associated with the magnetostratigraphy and the calcareous nannofossil datums. *1 Kotake et al. (1995), *2 Kotake (1988), *3 Kawakami and Shishikura (2006), *4 Ogg (2012)

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