Bir Zidan Member, Al Jir Formation: Lutetian, Libya
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Echinatus costeri
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Thysoporella cf. sylvestri
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| Algae | ||||||||||
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Hamischara sp.
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| Algae | ||||||||||
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Gastropoda
- Naticidae
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Natica cf. servorum
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Gastropoda
- Cypraeidae
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Gisortia (Vicetia) gigantea
(Munster 1828)
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| recombined as Gisortia gigantea | ||||||||||
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Gastropoda
- Turritellidae
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Turritella inbricataria
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Bivalvia
- Ostreida
- Malleidae
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Vulsella crispata
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Bivalvia
- Ostreida
- Gryphaeidae
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Gryphaea cf. arabica
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Tawadros 2001 | |||||||||
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Gryphaea exogyroides
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea subitus
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Ostrea aviola
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Ostrea cymbula
Lamarck 1806
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| SUBSPECIES: O. cymbula ramosa | ||||||||||
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Ostrea multicostata
Deshayes 1832
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| recombined as Cubitostrea multicostata | ||||||||||
| SUBSPECIES: O. multicostata strictiplicata | ||||||||||
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Bivalvia
- Pectinida
- Anomiidae
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Carolia cymbalea
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Bivalvia
- Carditida
- Carditidae
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Cardita aegyptica
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Echinoidea
- Clypeasteroida
- Laganidae
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Sismondia ocitana
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Echinoidea
- Clypeasteroida
- Fibulariidae
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Echinocyamus cambonensis
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Charales
- Characeae
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Maedleriella lavocatti
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| Algae | ||||||||||
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Charales
- Characea
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Chara sp.
Linnaeus 1753
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| Algae | ||||||||||
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unclassified
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Psilochara sp.
Grambast 1959
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| Algae | ||||||||||
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Raskyella pecki
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| Algae; SUBSPECIES: Raskyella pecki meridonale | ||||||||||
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Ulvophyceae
- Bryopsidales
- Halimedaceae
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Halimeda sp.
Lamouroux 1812
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| Algae | ||||||||||
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Chlorophyceae
- Dasycladales
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Acicularia sp.
d'Archiac 1843
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| Algae | ||||||||||
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Chlorophyceae
- Dasycladales
- Dasycladaceae
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Neomeris sp.
Lamouroux 1816
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| Algae | ||||||||||
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Tubothalamea
- Miliolida
- Rhapydioninidae
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Rhapydionina cf. urensis
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Tubothalamea
- Miliolida
- Peneroplidae
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Spirolina sp.
Lamarck 1804
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Tubothalamea
- Miliolida
- Soritidae
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Orbitolites complanatus
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Tubothalamea
- Miliolida
- Alveolinidae
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Alveolinidae indet.
Ehrenberg 1839
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Tawadros 2001 | |||||||||
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Fasciolites sp.
Parkinson 1811
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Tubothalamea
- Miliolida
- Miliolidae
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Spiroloculina sp.
d'Orbigny 1826
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Tubothalamea
- Miliolida
- Hauerinidae
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Quinqueloculina sp.
d'Orbigny 1826
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Rotaliidae
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Rotalia cf. tronchidiformis
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Tawadros 2001 | |||||||||
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Pararotalia cf. viennoti
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Pararotalia inermis
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Lockhartia sp.
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Nummulitidae
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Nummulites aff. distans
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Truncorotaloididae
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Truncorotaloides sp.
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Globigerinidae
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Globigerina sp.
d'Orbigny 1826
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Globorotaliidae
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Globorotalia sp.
Cushman 1927
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Valvulinidae
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Coskinolina sp.
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Lituonella sp.
Schlumberger and Douvillé 1905
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Globothalamea
- Rotaliida
- Discorbidae
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Discorbis sp.
Lamarck 1804
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Tawadros 2001 | |||||||||
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Lituolida
- Ammobaculinidae
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Haplophragmium sp.
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| see common names | ||||||||||
Geography
| Country: | Libya |
| Coordinates: | 30.9° North, 15.5° East (view map) |
| Paleocoordinates: | 24.4° North, 11.7° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | local area |
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: | Al Jir | Member: | Bir Zidan | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: LITHOSTRATIGRAPHIC RELATIONSHIPS: From the Bir Zidan Mbr of the Al Jir Fm (formerly Gir Fm of Bar and Weegar, 1972), which disconformably overlies the Bishimah Fm (Late Paleocene-Middle Eocene), and is overlain with the Wadi Thamet Fm (Middle-Late Eocene). AGE: Lutetian, on the basis of microfossil (foraminiferal) and molluscan biostratigraphy. THICKNESS: Approximately less than 20 m. | |||||
Lithology and environment
| Primary lithology: | dolomitic,shelly/skeletal,white,yellow poorly lithified "limestone" |
| Includes fossils? | Y |
| Lithology description: GENERAL LITHOLOGY: Several lithologies including light cream colored chalky limestone, unfossiliferous white chalky limestone, cream to dull white chalky limestone with regular patches of marly and dolomitized limestone rich in molluscan fossils, slightly dolomitized fossiliferous chalky limestone, and chalky limestone with rare fossils. LITHIFICATION: Poorly-lithified, not stated, but apparent from facies description. | |
| Environment: | carbonate indet. |
| Geology comments: ENVIRONMENT: Shallow marine neritic to lagoonal environment, with local brackish influence.
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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: | general faunal/floral analysis |
| Collection method comments: COLLECTORS: Not stated, possibly multiple collectors. REPOSITORY: Unknown. | |
| 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: | 42125 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-07-24 00:37:47 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-07-24 00:37:47 |
| 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] |
Secondary references:
| 11199 | E. E. Tawadros. 2001. Geology of Egypt and Libya 1-468 [A. Miller/A. Hendy/M. Clapham] |