Siwa Oasis (Oasis Member, Marmarica Fm): Middle Miocene, Egypt
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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Echinoidea
- Clypeasteroida
- Clypeasteridae
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Clypeaster sp.
Lamarck 1801
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Echinoidea
- Clypeasteroida
- Scutellidae
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Scutella sp.
Lamarck 1816
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| see common names | |||||||
Geography
| Country: | Egypt |
| Coordinates: | 29.2° North, 25.5° East (view map) |
| Paleocoordinates: | 28.5° North, 24.7° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | local area |
Time
| Period: | Neogene | Epoch: | Miocene |
| 10 m.y. bin: | Cenozoic 5 | ||
| Key time interval: | Middle Miocene | ||
| Age range of interval: | 15.98000 - 11.63000 m.y. ago |
Stratigraphy
| Formation: | Marmarica | Member: | Oasis | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: The Miocene succession fo the Siwa Depression can be subdivided into three units. The lowermost unit is the Oasis Member and consists of alternating carbonate beds and greenish, bluish, and blackish shales and marls. The carbonates are made up of cross-bedded coquina and other organoclastic limestones. Cross-bedding shows paleocurrent directions predominantly to the north and northwest. The Marmarica Formation is assigned a middle Miocene age and has a thickness of 78 m (256 ft). | |||||
Lithology and environment
| Primary lithology: | "cross stratification",shelly/skeletal "limestone" |
| Secondary lithology: | black,green,blue "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Consists of alternating carbonate beds and greenish, bluish, and blackish shales and marls. The carbonates are made up of cross-bedded coquina and other organoclastic limestone. | |
| Environment: | carbonate indet. |
| Geology comments: The formation contains a rich neritic and reefal assemblage of invertebrate fossils and foraminifera. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: Collection data based on review of previously published literature. | |
| Taxonomic list comments:Comprises taxa mentioned in text as typical of formation, including molluscs and forams. Page 145 of Tawadros (2001) | |
Metadata
| Database number: | 42060 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | P. Mannion | Research group: | marine invertebrate |
| Created: | 2004-07-23 00:01:21 | Last modified: | 2022-08-25 08:40:47 |
| Access level: | the public | Released: | 2004-07-23 00:01:21 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11199. | E. E. Tawadros. 2001. Geology of Egypt and Libya 1-468 [A. Miller/A. Hendy/M. Clapham] |