Al Gata Member, Wadi Thamat Formation: Lutetian, Libya
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Echinoidea
- Echinolampadoida
- Echinolampadidae
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Echinolampas sp.
Gray 1825
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Gastropoda
- Strombidae
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Rostellaria sp.
Lamarck 1799
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| synonym of Tibia | ||||||||||
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Bivalvia
- Pectinida
- Anomiidae
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Carolia sp.
Cantraine 1838
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea multicostata
Deshayes 1832
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| recombined as Cubitostrea multicostata | ||||||||||
| SUBSPECIES: O. multicostata strictiplicata | ||||||||||
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Ostrea oviola
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Bivalvia
- Ostreida
- Gryphaeidae
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Ostrea exogyroides
Roemer 1835
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| synonym of Praeexogyra dubiensis | ||||||||||
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Lituolida
- Haplophragmoididae
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Haplophragmoides latidorsatum
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Globothalamea
- Rotaliida
- Nonionidae
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Nonion sp.
Monfort 1808
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Globothalamea
- Rotaliida
- Discorbidae
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Discorbis sp.
Lamarck 1804
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Nodosariata
- Nodosariida
- Nodosariidae
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Frondicularia sp.
Defrance 1824
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Lagena sp.
Walker and Boys 1784
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Rotaliidae
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Lockhartia sp.
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Elphidiidae
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Elphidium sp.
Monfort 1808
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| see common names | ||||||||||
Geography
| Country: | Libya |
| Coordinates: | 29.8° North, 16.6° East (view map) |
| Paleocoordinates: | 23.2° North, 12.6° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | basin |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Lutetian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Lutetian | ||
| Age range of interval: | 47.80000 - 41.20000 m.y. ago |
Stratigraphy
| Formation: | Wadi Thamat | Member: | Al Gata | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: LITHOSTRATIGRAPHIC RELATIONSHIPS: From the Al Gata Mbr of the Wadi Thamat Fm, which overlies the Al Jir (middle Eocene) and is overlain by the Thmed Al Qusur Mbr of the Wadi Thamat Fm (Priabonian). AGE: Lutetian, on the basis of microfossil (foraminiferal) and macrofossil biostratigraphy. THICKNESS: averages 90 m across its range. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal,green,yellow lithified calcareous marl |
| Includes fossils? | Y |
| Lithology description: GENERAL LITHOLOGY: Greenish-yellow to buff marls grading into calcilutite crowded with oysters with subordinate intercalations of yellowish white organodetrital limestone. LITHIFICATION: Lithified, not stated, but apparent from facies description. | |
| Environment: | shallow subtidal indet. |
| Geology comments: ENVIRONMENT: Shallow marine littoral to neritic environment of deposition.
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Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,microfossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: COLLECTORS: Not stated, possibly multiple collectors. REPOSITORY: Unknown.
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| Taxonomic list comments:COVERAGE: Limited, but including bivalvia, gastropoda, echinoids, algae, and foraminifera. NOMENCLATURE: Somewhat antiquated nomenclature, but identified to species and subgenus resolution. | |
Metadata
| Database number: | 42138 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-07-24 15:14:55 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-07-24 15:14:55 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 26106. | M. F. Megerisi and V. D. Mamgain. 1980. The Upper Cretaceous-Tertiary Formations of northern Libya: a synthesis. Department of Geological Researches and Mining Bulletin 12:1-85 [A. Hendy/A. Hendy] |