Taxonomy:
Distinguishing features: Large (9-10 µm) Pontosphaera with elevated rim and distal flange; sculpted margin and large central opening.
Farinacci & Howe catalog pages: S. wechesensis * , D. amphitheatralis + * , K. excelsa *
Ecology & Biogeography: Described from shallow marine sediments in Texas and inferred to be a neritic species.
Tags | LITHS: murolith, elliptical, CA: vacant, CROSS-POLARS: rim-unicyclic, V-prominent, R-prominent, |
Metrics | Lith size: 9->11µm; Data source notes: lith size from ODs |
Geological Range:
Last occurrence (top): within Middle Eocene Sub-Epoch (37.75-47.84Ma, top in Bartonian stage). Data source: Bukry & Percival 1971
First occurrence (base): within Middle Eocene Sub-Epoch (37.75-47.84Ma, base in Lutetian stage). Data source: Bukry & Percival 1971
Plot of occurrence data:
Aubry, M-P. (1986a). Palaeogene calcareous nannofossil biostratigraphy of northwestern Europe. Palaeogeography Palaeoclimatology Palaeoecology. 55: 267-334. gs Aubry, M. -P. (1990). Handbook of Cenozoic calcareous nannoplankton. Book 4: Heliolithae (Helicoliths, Cribriliths, Lopadoliths and others). Micropaleontology Press, American Museum of Natural History, New York. 1-381. gs Bukry, D. & Percival, S. F. (1971). New Tertiary calcareous nannofossils. Tulane Studies in Geology and Paleontology. 8: 123-146. gs V O Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs V O Levin, H. L. & Sherwood, R. W. (1971). A new Eocene species of Discolithina from Texas. Journal of Paleontology. 45(4): 731-733. gs Perch-Nielsen, K. (1971c). Elektronenmikroskopische untersuchungen an Coccolithen und verwandten Formen aus dem Eozan von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab. 18(3): 1-76. gs Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V OReferences:
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Pontosphaera wechesensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-1-2021
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