Taxonomy:
Distinguishing features: Large to very large (~>9µm), broadly elliptical reticulofenestrids with broad tube and narrow central area that can be distinctly quadrate or lens-shaped.
Farinacci & Howe catalog pages: R. hillae *
Search data:Tags | LITHS: placolith, elliptical, CA: ca_conjunct, grill, vacant, CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent, |
Metrics | Lith size: 9->14µm; |
Geological Range:
Notes: Particularly conspicuous in the Eocene/Oligocene boundary interval and lower Oligocene (Zones NP19/20-NP22) but also present in the Eocene (Zones NP17-NP19/20) (Bown & Dunkley Jones, 2012)
Last occurrence (top): within NP22 zone (32.02-32.92Ma, top in Rupelian stage). Data source: Bown & Dunkley Jones, 2012
First occurrence (base): within NP17 zone (37.32-40.40Ma, base in Bartonian stage). Data source: Bown & Dunkley Jones, 2012
Plot of occurrence data:
Bown, P. R. & Dunkley Jones, T. (2012). Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). Journal of Nannoplankton Research. 32(2): 3-51. gs V O Bown, P. R. & Newsam, C. (2017). Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research. 37(1): 25-60. gs V O 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 Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gsReferences:
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Reticulofenestra hillae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-1-2021
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