Crux87 INANewsl fig12.JPG
Bown_etal_1998 EK 5-05-08.jpg
Distinguishing features:
Small-medium sized (4-6µm) Watznaueria with relatively wide central area (approximately the same width as the rim) spanned by an irregular grill of blocky laths. In LM the grill is impercetible or weakly birefringent.
Crux87 INANewsl fig12.JPG
Bown_etal_1998 EK 5-05-08.jpgTaxonomy:
Farinacci & Howe catalog pages: Watznaueria rawsonii *
Distinguishing features:
Small-medium sized (4-6µm) Watznaueria with relatively wide central area (approximately the same width as the rim) spanned by an irregular grill of blocky laths. In LM the grill is impercetible or weakly birefringent.
Difficult to definitively identify in LM because the grill is imperceptible.
Morphology remarks:
Geological Range:
Last occurrence (top): within Barremian Stage (126.30-130.77Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Bown et al. 1998
Plot of occurrence data:
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 Crux, J. A. (1987c). Six new species of calcareous nannofossils from the Lower Cretaceous strata of England and Germany. INA Newsletter. 9: 30-35. gsReferences:
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Watznaueria rawsonii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-10-2019
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11311 Go to Archive.is to create a permanent copy of this page - citation notes |