| Daughter taxa: (blue => in age window 0-800Ma) | Granddaughter taxa | ||||
 |  |  |  | Lithostromation Triangular to stellate nannoliths with porous structure formed from small crystallites. | |
 |  |  |  | Imperiaster Very large (15-30 µm) nannolith formed of 6 rays in two superposed offset triplets | |
 |  |  |  | Lacunolithus Disk-shaped with ca 10 radiate ridges | |
| Martiniaster Disk-shaped with 12 radiate ridges | |||||
 | |  |  | Isolithus Simple triradiate nannolith | |
Taxonomy:
Distinguishing features: Large (10-20µm) triangular to stellate nannoliths with porous structure formed from small crystallites. In xpl behave as single crystal unit with low birefringence
Farinacci & Howe catalog pages: Lithostromationaceae [no catalog entry yet]
Morphology: Crystallography - probbly the same as discoasters, i.e formed entirely of V-units. The nannoliths are thick anf often slightly tiltedso show some birefringence [my interpretation - JRY 2017]
Ecology & Biogeography: Typically confined to epicontinental areas.
| Tags | LITHS: |
| Metrics | Lith size: 2->30µm; |
Geological Range:
Last occurrence (top): in mid part of Ionian Stage (52% up, 0.4Ma, in Ionian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M., Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gsReferences:
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Lithostromationaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-1-2021
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=828 Go to Archive.is to create a permanent copy of this page - citation notes |