JBH-B90 Jebel Boulahoujeb, Lansarine Chain: Late/Upper Hauterivian, Tunisia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Phylloceratida
- Phylloceratidae
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Phyllopachyceras infundibulum
(d'Orbigny 1840)
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1 category | |||||||||
| categories based on specimen counts | ||||||||||
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Cephalopoda
- Ammonitida
- Desmoceratidae
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Plesiospitidiscus sp.
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1 category | |||||||||
| categories based on specimen counts | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Tunisia |
| Coordinates: | 36.8° North, 9.6° East (view map) |
| Paleocoordinates: | 22.6° North, 14.3° East |
| Basis of coordinate: | estimated from map |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Hauterivian | 10 m.y. bin: | Cretaceous 2 |
| Key time interval: | Late/Upper Hauterivian | Ammonoid zone: | Plesiospitidiscus ligatus |
| Age range of interval: | 132.60000 - 125.77000 m.y. ago |
Stratigraphy
| Geological group: | M' Chergua | Formation: | El Mergueb | Member: | H3 |
| Local section: | Jebel Boulahoujeb B | Local bed: | 90 | ||
| Local order: | bottom to top | ||||
| Stratigraphy comments: The section JBH-B starts after a lateral displacement of 10m to north–west from the top of section JBH-A. About 20m of limestone–marl alternations of the upper Valanginian are exposed at the base of the succession. The Hauterivian is represented by 783m of thickness, including a 65m gap of observation. | |||||
Lithology and environment
| Primary lithology: | lithified calcareous "limestone" |
| Lithology description: About 20m of limestone–marl alternations of the upper Valanginian are exposed at the base of the succession. The Hauterivian is represented by 783m of thickness, including a 65m gap of observation. The succession is characterized by calcareous bundles that are limestone-dominated intervals (thick calcareous beds and reduction of marl-bed thickness); they are separated by thick marl-dominated intervals. Starting by a sandstone bed (JBH-B3; 3 m, ochre's colour), the lower part of the section JBH-B is composed by two calcareous bundles named H1 (JBH-B5 to B20; 34 m) | |
| Environment: | marine indet. |
| Geology comments: The Jebel Boulahouajeb section belongs the Tunisian trough a strongly subsiding basin from the Jurassic to Cretaceous time span. It corresponds to a deep marine palaeoenvironment characterized by pelagic-deep deposits. | |
Taphonomy
| Modes of preservation: | cast,mold/impression,original aragonite,original calcite |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera,some microfossils |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 205698 | ||
| Authorizer: | A. Kocsis | Enterer: | M. Gomez Correa |
| Modifier: | M. Gomez Correa | Research group: | marine invertebrate |
| Created: | 2019-10-18 08:47:29 | Last modified: | 2019-10-18 08:49:38 |
| Access level: | authorizer only | Released: | 2021-10-18 08:47:29 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 70462. | S. Melliti, S. Reboulet, N. Ben Haj Ali, M. S. Arfaoui, F. Zargouni and L. Memmi. 2019. Ammonoid and foraminiferal biostratigraphy from uppermost Valanginian to lowermost Barremian of the Jebel Boulahouajeb section (northern Tunisia). Journal of African Earth Sciences 151:438-460 [A. Kocsis/M. Gomez Correa] |