Distinguishing features:
Large (8-12 µm) Watznaueria with two well-defined pores separated by a conjunct transverse bar.
Bown_etal_1998 EK 5-05-06.jpg
Cepek78pl2-05.JPG
Grun_and_Allemann_1975-09.JPG
Bown_etal_1998 EK 5-12-16.jpg
Thibault 2010 pl6-fig21-22.JPG
Black1973-26-14.JPG
Bukry1969 pl10-08.JPG
Bukry1969 pl10-09.JPG
Bukry1969 pl10-10.JPG
Burnett in Gale 1996 f6-13m.JPG
Burnett1998-6-07-21.jpg
Burnett1998-6-07-22.jpg
Burnett1998-6-07-26.jpg
CalcPal-wbip_com.jpg
Cepek78pl2-04.JPG
HardasMutterlose 2008 pl1-09.JPG
HardasMutterlose 2008 pl1-10.JPG
Mai2001pl7-9.JPG
TypeFig Watznaueria biporta.jpgTaxonomy:
Farinacci & Howe catalog pages: Watznaueria biporta *
Distinguishing features:
Large (8-12 µm) Watznaueria with two well-defined pores separated by a conjunct transverse bar.
Both Black (1973) and Bukry (1969) illustrate specimens apparently with the remains of a grill in the pores.
Morphology remarks:
It is noteworthy that all the illustrated specimens are genuinely large - typically 9-11 µm long, whilst W. barnesiae is rarely more than 8 µm. On the othe hand it is a very sporadically distributed form. Possibly this is a morphotype which develops when W. barnesiae gets very large. [my interpretation - JRY 2020]
| Tags | LITHS: placolith, elliptical, CA: bar, CSPH: equant, monomorphic, R-UNITS: R-prominent, DETAILS: ca_conjunct, rim-unicyclic, |
| Metrics | Lith size: 8->12µm; Sources: original description & illustrated specimens |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Lees & Bown 2005 - consistently present to end Cret
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: oral comms during Jurassic workshop, Lyon 2016 and Neptune records
Plot of occurrence data:
Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs :: :: Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs :: :: Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs :: :: Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs :: :: Cepek, P. (1978). Mesozoic calcareous nannoplankton of the Eastern North Atlantic, Leg 41. Initial Reports of the Deep Sea Drilling Project. 41: 667-687. gs :: view :: open Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs :: :: Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs :: view :: open Hardas, P. & Mutterlose, J. (2008). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs :: :: Mai, H. (2001). New coccolithophorid taxa fom the Guelhemmerberg airshaft. Lower Paleocene, The Netherlands. Micropaleontology. 47: 144-154. gs :: :: Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs :: view :: openReferences:
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Watznaueria biporta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-6-2020
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11301 Go to Archive.is to create a permanent copy of this page - citation notes |