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). 169. Eisenackia crassitabulata (here part of Alisocysta reticulata group) (Sample 189-1172D-29R-5, 40-42 cm) (SEM). 170, 171. Enneadocysta sp. A (Sample 189-1172D-3R-4, 40-42 cm) (SEM). 172. Enneadocysta partridgei (Sample 189-1172A-39X-4, 147-149 cm) (SEM). 173, 174. Eocladopyxis sp. (Sample 189-1172D-12R-7, 40-42 cm) (SEM); (174) note hollow processes, penetrating endophragm. 175-180. Glaphyrocysta spp. (Sample 189-1172D-23R-1, 41-43 cm) (SEM); (178) detail archaeopyle margin; (180) operculum.