Shaqra Group (Dhruma Fm.): Bajocian, Saudi Arabia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Ampullinidae
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Ampullospira sp.
Harris 1897
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| spelled with current rank as Ampullina (Ampullospira) | ||||||||||
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia ex gr. pullus
Sowerby 1826
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Bivalvia
- Ostreida
- Eligmidae
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Eligmus polytypus
Eudes-Deslongchamps 1856
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Cephalopoda
- Ammonitida
- Stephanoceratidae
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Cadomites sp.
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Cephalopoda
- Ammonitida
- Sonniniidae
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Dorsetensia sp.
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Rhynchonellata
- Terebratulida
- Zeilleriidae
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Zeilleria waltoni
(Davidson 1851)
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Echinoidea
- Clypeidae
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Clypeus sp.
Leske 1778
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| =sp.3 | ||||||||||
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Echinoidea
- Salenioida
- Acrosaleniidae
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Acrosalenia sp.
Agassiz 1840
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| =sp.A | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Saudi Arabia |
| Coordinates: | 23.3° North, 46.3° East (view map) |
| Paleocoordinates: | 2.7° South, 33.5° East |
| Basis of coordinate: | stated in text |
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
| Key time interval: | Bajocian | ||
| Age range of interval: | 170.90000 - 168.20000 m.y. ago |
Stratigraphy
| Geological group: | Shaqra | Formation: | Dhruma |
| Local section: | Coupe au Nord du Khashm Birk | Local bed: | D2,1a |
| Local order: | bottom to top |
Lithology and environment
| Primary lithology: | lithified "limestone" | ||
| Includes fossils? | Y | ||
| Environment: | lagoonal/restricted shallow subtidal | Tectonic setting: | cratonic basin |
| Geology comments: The Dhruma Fm essentially is composed of limestones and clayey rocks in its central outcrop zone but passes to detrial facies northwards and southwards. | |||
Taphonomy
| Size of fossils: | macrofossils,microfossils |
Collection methods and comments
| Collection methods: | bulk,mechanical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 48078 | ||
| Authorizer: | F. Fursich | Enterer: | S. Hicks |
| Modifier: | S. Hicks | Research group: | marine invertebrate |
| Created: | 2005-03-13 08:05:28 | Last modified: | 2005-03-14 04:37:13 |
| Access level: | the public | Released: | 2005-03-13 08:05:28 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11728. | J. Manivit, Y.-M. Le Nindre, and D. Vaslet. 1990. Le Jurassique D`Arabie Centrale. Document du BRGM 4(194):25-519 [F. Fursich/S. Hicks/W. Kiessling] |