Taxonomy:
Distinguishing features:
Parent taxon (Staurolithites): Loxolith muroliths with relatively narrow rim and wide central area spanned by axial cross bars. The cross is usually spine bearing. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic. NB The bicyclic/unicyclic separation is simply controlled by how far the inwards the R-units develop so, although it is a useful identification criterion, it almost certainly has no real phylogenetic significance and would be a very poor character for defining genera.
This taxon: Small (holotype 4 µm) bicyclic Staurolithites with narrow central area filled with a narrow axial cross. The bright inner cycle is broader than the outer cycle.
Farinacci & Howe catalog pages: V. mitcheneri *
Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 3->5µm; Data source notes: holotype +/-1µm |
Geological Range:
Last occurrence (top): within Early Aptian Substage (118.70-121.40Ma, top in Aptian stage). Data source: Bown et al. 1998
First occurrence (base): within Early Valanginian Substage (135.70-137.70Ma, base in Valanginian stage). Data source: Bown et al. 1998
Plot of occurrence data:
Aguado, R., Castro, J. M., Company, M. & de Gea, G. A. (1999). Aptian bioevents — an integrated biostratigraphic analysis of the Almadich Formation, Inner Prebetic Domain, SE Spain. Cretaceous Research. 20: 663-683. gs Aguado, R., et al. (2018). A new record of the Weissert episode from the Valanginian succession of Cehegín (Subbetic, SE Spain): bio- and carbon isotope stratigraphy. Cretaceous Research. 92: 122-137. gs Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs O Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs OReferences:
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Staurolithites mitcheneri compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-6-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11134 Go to Archive.is to create a permanent copy of this page - citation notes |
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