Umbria


Classification: Mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Umbria
Sister taxa: Bucanthus, Calcivascularis, Crucirhabdus, Diductius, Mitrolithus, Parhabdolithus, Timorella, Umbria,

Distinguishing features: Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Narrow, gently-sloping protolith rim with wide central area spanned by a plate of blocky laths. XPL image is bicyclic.

Specimens not identified to species level

Taxonomy:

Citation: Umbria Bralower & Thierstein in Bralower et al., 1989
Rank: Genus
Type species: Umbria granulosa Bralower & Thierstein in Bralower et al., 1989

Farinacci & Howe catalog pages: Umbria *

Distinguishing features: Protolith coccoliths with low, sloping rim; central area wide filled by blocky laths

Geological Range:
Last occurrence (top): at top of Berriasian Stage (100% up, 139.4Ma, in Berriasian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Tithonian Stage (62% up, 147.7Ma, in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs


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Umbria compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11279 Go to Archive.is to create a permanent copy of this page - citation notes



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