Distinguishing features: Murolith coccoliths with a distal/outer cycle of clockwise-imbricating elements.
| Daughter taxa (blue => in age window 0-300Ma) | Granddaughter taxa | ||||
| | | | Murolith (loxolith type) coccoliths with variably-developed proximal/inner cycles and central-areas typically spanned by axial, non-axial or diagonal cross-bars or a single transverse bar, which is commonly formed from four fused arms/bars. LM images may be unicyclic or bicyclic. | |
| | | | Murolith (loxolith type) coccoliths with well-developed proximal/inner cycles and typically wide central-areas spanned by axial, non-axial (± asymmetric) or diagonal cross-bars. The broad, proximal/inner cycle is conspicuous in the LM, creating a strongly bicyclic image. | |
| | | | Murolith (loxolith type) coccoliths with dominant distal/outer cycles and central-areas typically filled by a plate of granular calcite. The central structure may be spine-bearing, perforate or massive. LM images are typically unicyclic. | |
Taxonomy:
Farinacci & Howe catalog pages: Eiffellithales [no catalog entry yet]
Distinguishing features: Murolith coccoliths with a distal/outer cycle of clockwise-imbricating elements.
Geological Range:
Last occurrence (top): within Selandian Stage (59.24-61.61Ma, top in Selandian stage). Data source: Total of range of species in this database
First occurrence (base): within Norian Stage (209.46-228.35Ma, base in Norian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Bown, P.R., (1998). Triassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 29-33. Rood, A.P.; Hay, W.W. & Barnard, T., (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae, 64: 245-272.References:
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Eiffellithales compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-6-2018
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