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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Paleoceanography and dinoflagellate cyst stratigraphy across the Lower–Middle Pleistocene Subseries (Calabrian–Chibanian Stage) boundary at the Chiba composite section, Japan

Fig. 7

Dinoflagellate cysts from the Chiba composite section. Max. dia. = maximum diameter. EF = England Finder reference. a–c Spiniferites pachydermus sensu Mertens et al. (2015), dorsal view at upper (operculum in place), slightly lower and mid-focus; note apical protuberance and preserved endospore (arrow); central body length 43 μm, central body width 38 μm; sample TB2 00, slide 1 (10 μm) MJH, EF V16/4. d, e Spiniferites ramosus sensu Rochon et al. (1999), ventral-left-lateral view at upper and lower foci; central body length 33 μm; sample TB2 97, slide 3 (20 μm) MJH, EF M32/4. f, g Spiniferites sp. (a representative of Spiniferites spp. group A), apical view at upper and mid-foci, note preserved endospore (arrow); central body max. dia. 30 μm; sample TB2 97, slide 2 (10 μm) MJH, EF F13/0. h, i Spiniferites sp. B, view uncertain at upper and mid-foci; thin wall with distinctly granular periphragm surface; some processes tips petaloid; central body length 56 μm; sample TB2 97, slide 3 (20 μm) MJH, EF D34/0

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