Lapideacassaceae


Classification: Coccolithophores -> Nannolith families inc sed -> Lapideacassaceae
Sister taxa: Ceratolithaceae, Lapideacassaceae, Lithostromationaceae, Nannolith genera inc sed, Rhomboasteraceae,

Short diagnosis: Hemispherical to cylindrical nannoliths, with walls constructed from one to several cycles of thin elements, enclosing a hollow central space; the nannolith tapers distally, and may have long apical spines or processes.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Hemispherical to cylindrical nannoliths, with walls constructed from one to several cycles of thin elements, enclosing a hollow central space; the nannolith tapers distally, and may have long apical spines or processes.
Species arranged here by number of spines.

Bell shaped nannofossil with basal flange and apical horn(s), formed of single cycle of elements

Taxonomy:

Citation: Lapideacassaceae Bown & Young, 1997
Rank: Family
Notes & discussion: Rare and sporadic stratigraphic distribution, but Cretaceous/Tertiary boundary survivor.

Farinacci & Howe catalog pages: Lapideacassaceae [no catalog entry yet]

Short diagnosis: Hemispherical to cylindrical nannoliths, with walls constructed from one to several cycles of thin elements, enclosing a hollow central space; the nannolith tapers distally, and may have long apical spines or processes.


Morphology remarks: Crystallographic orientations: The entire nannolith is formed of R-units, in side view the c-axes are inclined upward slightly (so with gypsum plate when vertical the left hand side is blue and the right hand side yellow). In apical view the c-axes are slightly oblique from radial. [JRY 2017 my obs, and interpretation of published micrographs] 

Search data:
TagsLITHS: nannolith-radiate, tubular, circular, RIM: tiered,
CSPH: not known, V-UNITS: none, R-UNITS: all, DETAILS: c-axes flaring,
MetricsLith size: 0->0µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Tortonian Stage (7.25-11.62Ma, top in Tortonian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Young, J.R., (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19(1): 21-36.

Kennedy, W.J.; Gale, A.S.; Bown, P.R.; Caron, M.; Davey, R.J.; Grocke, D. & Wray, D.S., (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre ́-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research, 21(591-720).


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Lapideacassaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-11-2017

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