Plate P1. Illustrations of taxa, sample, and slide number. Scale bar = ~20 µm unless stated otherwise. Scanning electron microscope (SEM) photographs have varying scale bars. 1. Adnatosphaeridium multispinosum (Sample 189-1172D-15R-3, 40-42cm) (1). 2. Aio

Plate P1 (continued). 193. Operculodinum? sp. A (Sample 189-1172D-24R-5, 40-42 cm) (SEM). 194-196. Operculodinium spp. (SEM); (194) Sample 189-1172D-23R-1, 41-43 cm; (195, 196) Sample 189-1172A-39X-4, 147-149 cm. 197. Palaeocystodinium spp. (Sample 189-1172D-23R-1, 41-43 cm) (SEM). 198-200. Paucisphaeridium spp. (Sample 189-1172D-3R-4, 40-42 cm) (SEM). 201. Phthanoperidinium echinatum (Sample 189-1172A-39X-3, 138-140 cm) (SEM). 202-204. Senegalinium dilwynense (Sample 189-1172D-23R-1, 41-43 cm) (SEM); (202) ventral view; (203) dorsal view; (204) Senegalinium dilwynense (right) and Diconodinium sp., (left).