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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Calcareous nannofossil biostratigraphy of the Lower–Middle Pleistocene boundary of the GSSP, Chiba composite section in the Kokumoto Formation, Kazusa Group, central Japan, and implications for sea-surface environmental changes

Fig. 5

Main calcareous nannofossils in the CbCS. a crossed nicols. b Without nicols. (1) Calcidiscus leptoporus (Murray & Blackman) Loeblich & Tappan, Sample TB2-16. (2) Coccolithus pelagicus braarudii (Gaarder) Geisen et al., Sample TB2-16, 3. Coccolithus pelagicus pelagicus (Wallich) Schiller, Sample TB2-16. (4) Gephyrocapsa parallela Hay & Beaudry or Gephyrocapsa omega Bukry, Sample TB3-15. (5) Pseudoemiliania lacunosa Kamptner ex Gartner, Sample TB3-15. (6) Umbilicosphaera sibogae (Weber-van Bosse) Gaarder, Sample TB2-16. (7) Helicosphaera carteri (Wallich) Kamptner, Sample TB3-15. (8) Florisphaera profunda Okada & Honjo, Sample TB3-15. Scale bar is 5 μm

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