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Progress in Earth and Planetary Science
Fig. 9 | Progress in Earth and Planetary Science

Fig. 9

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

Fig. 9

Dinoflagellate cysts from the Chiba composite section. Max. dia. = maximum diameter. EF = England Finder reference. a–c cyst of Protoceratium reticulatum, ventral view at upper, slightly lower, and mid-foci; b showing characteristic rounded adapical margin of detached operculum, also in ventral view, within cyst; central body max. dia. 40 μm; sample TB2 00, slide 3 (10 μm) MJH, EF Q9/4. d–f Operculodinium? longispinigerum, view uncertain; note finely granulate central body surface, solid tapering processes, somewhat flexuous with finely granulate surfaces distally and with circular bases; central body max. dia. 33 μm; sample TB 58, slide 1 (10 μm), EF J10/1. g Brigantedinium cariacoense, ventral view at mid-focus on archeopyle; cyst max. dia. 38 μm; sample TB 34, slide 1 (10 μm), EF H40/0. h, i Brigantedinium sp., dorsal view at mid- and lower focus; cyst max. dia. 36 μm; sample TB 72, slide 1 (10 μm), EF K38/1

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