Where: Mahajanga, Madagascar (16.5° S, 46.2° E: paleocoordinates 40.5° S, 29.6° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Microfossil Bed Member, Early/Lower Albian (112.0 - 109.0 Ma)
• From Microfossil 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).
• bed-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified, glauconitic, gray siltstone
Size class: macrofossils
Reposited in the MfN
Collection methods: bulk, sieve,
• 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 French-Madagascar ammonite traders a few years ago, who had relocated the the locality. Processed using a 5-10% H2O solution using standard procedures, 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.
Primary reference: 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]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 60072: authorized by Austin Hendy, entered by Austin Hendy on 29.04.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Gastropoda | |
Zardinistylus cretaceus snail | |
Conjectura minuta Kiel 2006 snail | |
Pommerozygia mahajangensis Kiel 2006 snail | |
Opaliopsis franciscae snail | |
| |
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Tessarolax retusa Sowerby 1836 snail
Latiala besairiei snail | |
? Paladmete rasoarinoroae Kiel 2006 snail | |
| |
? Vatopsis sp. Gründel 1980 snail | |
Entomope crassilabrum Kiel 2006 snail | |
Cocculina sensu lato sp. Dall 1882 snail | |
Tomura ambatolafiensis Kiel 2006 snail | |
"Actaeon sp." = Acteon
"Actaeon sp." = Acteon Montfort 1810 snail | |
Ringinella lacryma snail | |
? Mathildidae indet., "Carinathilda cf. microstriata" = Angulathilda microstriata, Gymnothilda pagodoida, Carinathilda parvuruga, Carinathilda bandeli
? Mathildidae indet. Dall 1889 snail Juvenile mathildid? [originally entered as "? Mathilididae sp."]
"Carinathilda cf. microstriata" = Angulathilda microstriata Schroder 1995 snail
Gymnothilda pagodoida snail
Carinathilda parvuruga snail
Carinathilda bandeli Kiel 2006 snail | |
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