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). 37-39. Cleistosphaeridium placacanthum (Sample 189-1172D-8R-6, 40-42 cm) (2). 40-42. Cordosphaeridium fibrospinosum group (Sample 189-1172D-5R-1, 40-42 cm) (1). 43. Corrudinium sp. Goodman and Ford, 1983 (Sample 189-1172A-39X-5, 85-87 cm) (1). 44-47. Cribroperidinium sp. A; (44, 45) Sample 189-1172A-46X-2, 85-87 cm (1); (46, 47) Sample 189-1172D-12R-1, 40-42 cm (1). 48. Cribroperidinium sp. A (Sample 189-1172D-12R-1, 40-42 cm) (1).