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Progress in Earth and Planetary Science
Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: Basin-wide erosion and segmentation of the Plio-Pleistocene forearc basin in central Japan revealed by tephro- and biostratigraphy

Fig. 4

Geologic columns of the Ikego and Urago formations, Miura Peninsula (after Utsunomiya et al. 2017), showing magnetic polarity and calcareous nannofossil biozones. Note that tephra beds IkT16 and 19 are intercalated immediately above the top of the Mammoth subchronozone. Ahn is within CN12b–c. Ahn is between the top of Discoaster tamalis (2.76 Ma) and tephra bed KGP (ca. 2.5 Ma), which is consistent with the estimated age of the widespread tephra UN-MD2 (2.7–2.6 Ma). The calcareous nannofossil zonal scheme follows that of Okada and Bukry (1980). The notation of the paleomagnetic polarity zones is from Ogg (2020)

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