Distinguishing features: squat, cylindrical; without flanges
Taxonomy:
Farinacci & Howe catalog pages: Nannoconus inornatus *
Distinguishing features: squat, cylindrical; without flanges
Morphology remarks: Short, cylindrical nannoconids with thin and low angled wall cycles, and relatively narrow axial canal.
Differs from N. abundans in lacking an flanges, from N. circularis, N. globulus and N. inconspicuous in having a narrower canal, and from N. ligius in its non-petalloid profile.
Ecology & Biogeography: Mainly Boreal (North Sea Basin) distribution.
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 Late Hauterivian Substage (130.77-133.09Ma, base in Hauterivian 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 Rutledge, D. & Bown, P. R. (1996). New names for old: taxonomic clarification of some Early Cretaceous nannofossil marker-species. Journal of Nannoplankton Research. 18: 53-59. gsReferences:
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Nannoconus inornatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-12-2019
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