Taxonomy:
Distinguishing features: 5 rayed nannolith with complex struture
Farinacci & Howe catalog pages: P. lisbonensis *
Morphology: Described as having "the basic structure of a dodecahedron of pentagons with five long rays projecting from the equator".
See also: Micrantholithus mirabilis - possible overgrown variant/senior synonym;
Search data:Tags | LITHS: nannolith-radiate, pentagonal, star-shaped, CA: process, CROSS-POLARS: T-prominent, |
Metrics | Lith size: 12->15µm; Segments: 5->5; |
Geological Range:
Notes: No records in Neptune database but recorded as stratigraphically useful in nearshore deposits of both NE USA (Eg. Edwards et al. 2000) and NW Europe (e.g. Steurbaut 1988)
Last occurrence (top): within Middle Eocene Sub-Epoch (37.75-47.84Ma, top in Bartonian stage). Data source: Bybell & Gartner 1972
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Edwards et al. 2000
Plot of occurrence data:
Bybell, L. M. & Gartner, S. (1972). Provincialism among mid-Eocene calcareous nannofossils. Micropaleontology. 18(319-336): -. gs 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 Edwards, L. et al. (2000). Supplement to the preliminary stratigraphic database for subsurface sediments of Dorchester county, South Carolina (http://pubs.usgs.gov/openfile/of00-049/ChapB/T_CN_dat.htm). U.S. Geological Survey Open-file Report. 1-2. gs Steurbaut, E. (1988). New Early and Middle Eocene calcareous nannoplankton events and correlations in middle to high latitudes of the northern hemisphere. Newsletters on Stratigraphy. 18: 99-115. gsReferences:
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Pentaster lisbonensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021
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