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Stratigraphy of the Late Middle Eocene to Early Oligocene in the Bath Cliff Section, Barbados, West Indies

1984; Micropaleontology Press; Volume: 30; Issue: 4 Linguagem: Inglês

10.2307/1485710

1937-2795

John B. Saunders, Daniel Bernoulli, Edith Müller-Merz, Hedi Oberhänsli, K. Perch-Nielsen, William R. Riedel, Annika Sanfilippo, R. Torrini, Edith Müller-Merz, Hedi Oberhänsli,

Paleontology and Stratigraphy of Fossils

Changes in fauna and flora across the Eocene/ Oligocene boundary are documented in an expanded section of indurated deep sea oozes and ash beds deposited close to the CCD and now exposed at Bath Cliff, Barbados. A sedimentation rate of 27 m/m.y. for the Late Eocene is calculated. The spread of events through time does not suggest any catastrophe at the boundary. The last occurrence of discshaped discoasters (CP 15/CP 16 Zone boundary) occurs before the last occurrence of Hantkenina, which is taken to represent the epoch boundary. The last occurrence of Turborotalia cerroazulensis s.I. occurs slightly before the boundary, whereas the Cryptoprora omata/Theocyrtis tuberosa radiolarian Zone boundary occurs slightly after it. The Thyrsocyrtis bromia radiolarian Zone of the Late Eocene has been replaced by three new zones-from top to bottom: Cryptoprora omata Zone, Calocyclas bandyca Zone, and Carpocanistrum azyx Zone. A microtektite horizon occurs in the Cryptoprora ornata Zone slightly less than one million years before the epoch boundary. In the basal Oligocene a sudden enrichment of 180 in Oridorsalis umbonatus suggests a drop in bottom water temperature of 5-6?C. Stratigraphy of the late Middle Eocene to Early Oligocene in the Bath Cliff section, Barbados, West Indies