"Ammonite" bed - Ambatolafia, Mahajanga Basin, Madagascar: Early/Lower Albian, Madagascar
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
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Mahajangina weitschati
Kiel 2006
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1 specimen | |||||||||
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Gastropoda
- Heterostropha
- Ringiculidae
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Ringinella lacryma
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3 specimens | |||||||||
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Gastropoda
- Heterostropha
- Mathildidae
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Gymnothilda pagodoida
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2 specimens | |||||||||
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Gastropoda
- Nystiellidae
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Opaliopsis franciscae
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2 specimens | |||||||||
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Gastropoda
- Ampullinidae
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Ampullina gaultina
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11 specimens | |||||||||
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Gastropoda
- Cryptaulacidae
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Cirsocerithium collignoni
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30 specimens | |||||||||
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Gastropoda
- Metacerithiidae
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Metacerithium aff. trimoline
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10 specimens | |||||||||
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Gastropoda
- Neogastropoda
- Paladmetidae
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? Paladmete rasoarinoroae
Kiel 2006
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11 specimens | |||||||||
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Gastropoda
- Aporrhaidae
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Tessarolax retusa
Sowerby 1836
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3 specimens | |||||||||
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Latiala besairiei
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200 specimens | |||||||||
| > 200 specimens | ||||||||||
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Gastropoda
- Pseudomelaniidae
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Pseudomelania requieniana
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1 specimen | |||||||||
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Gastropoda
- Discohelicidae
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Delpeya cottreaui
Collignon 1949
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23 specimens | |||||||||
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Gastropoda
- Turbinidae
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Semisolarium bassae
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52 specimens | |||||||||
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Gastropoda
- Pleurotomariidae
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Leptomaria magneti
Collignon 1949
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1 specimen | |||||||||
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Cephalopoda
- Ammonitida
- Beudanticeratidae
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Cleoniceras besairiei
Collignon 1949
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Salamon et al. 2023 | 27 specimens | ||||||||
| recombined as Aioloceras besairiei | ||||||||||
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Crinoidea
- Cyrtocrinida
- Phyllocrinidae
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Apsidocrinus sp.
Jaekel 1907
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Salamon et al. 2023 | |||||||||
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Crinoidea
- Roveacrinida
- Saccocomidae
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Saccocoma sp.
Agassiz 1836
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Salamon et al. 2023 | |||||||||
| see common names | ||||||||||
Geography
| Country: | Madagascar | State/province: | Mahajanga |
| Coordinates: | 16.5° South, 46.2° East (view map) | ||
| Paleocoordinates: | 40.5° South, 29.6° East | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Albian | 10 m.y. bin: | Cretaceous 4 |
| Key time interval: | Early/Lower Albian | ||
| Age range of interval: | 113.00000 - 109.90000 m.y. ago |
Stratigraphy
| Member: | Microfossil Bed | ||||
| Local section: | Ambatolafia | ||||
| Regional section: | Mahajanga | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: From Ammonite bed. Ammonites collected from a sandstone layer ("ammonite bed"), which is 15-20 cm thick. Above this unit is a 15 cm thick bed of siltstone ("microfossil bed", with sparse gastropods and bivalves. Overlain by further barren siltstone of 10 cm thickness. The fauna belongs to the Cleoniceras besairiei Zone of the lower Albian (Collignon, 1963). | |||||
Lithology and environment
| Primary lithology: | glauconitic lithified sandstone |
| Includes fossils? | Y |
| Lithology description: Hard, glauconite sandstone. | |
| Environment: | marine indet. |
| Geology comments: No specific environmental or geologic data reported by authors. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Abundance in sediment: | abundant |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | bulk,sieve,field collection | ||
| Minimum sieve size: | 2.000 | Maximum sieve size: | 0.500 |
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | MfN | ||
| Collection method comments: The material is deposited in the Museum für Naturkunde, Berlin, Germany. This is a recollection of a locality originally reported by Collignon (1949), based on collections by H. Besairie and V. Hourcq. This locality fell into oblivion until rediscovered by Fren ch-Madagascar ammonite traders a few years ago, who had relocated the the locality. Samples dried and treated with a saturated Glaubers salt solution, then washed through sieves with mesh sizes of 2, 1, 0.5, 0.2, and 0.064 mm. Gastropods only picked from the 2, 1 and 0.5 mm fractions. | |||
| Taxonomic list comments:Exhaustive for gastropoda. Bivalves and ammonites are excluded from this publication. These are presumably listed by Collignon (1949). | |||
Metadata
| Database number: | 60071 | ||
| Authorizer: | A. Hendy, W. Kiessling | Enterer: | A. Hendy, A. Watson |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2006-04-29 18:30:58 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2006-04-29 18:30:58 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 17264. | S. Kiel. 2006. New and little-known gastropods from the Albian of the Mahajanga Basin, northwestern Madagascar. Journal of Paleontology 80(3):455-476 [A. Miller/A. Hendy] |
Secondary references:
| 17265 | M. Collignon. 1949. Recherches sur les Faunes Albiennes de Madagascar I, - L'Albien d'Ambarimaninga. Annales géologiques du Service des Mines 16:1-128 [A. Miller/A. Hendy] | |
| 88238 | M. A. Salamon, S. Jain, M. Krajewski, P. Duda, B. Ferré, M. Benzaggagh, and B. J. Płachno. 2023. Sheltered preservation of cyrtocrinid crinoids from the Lower Cretaceous of Madagascar and their palaeogeographic significance. Journal of Palaeogeography 12(1):969-81 [W. Kiessling/A. Watson] |