Ankazomihaboka Formation

Ankazomihaboka Formation
Stratigraphic range: Coniacian ~89–86  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Marovoay Beds
Overlies	Basalt
Lithology
Primary	Claystone, sandstone
Location
Coordinates	16°12′S46°42′E / 16.2°S 46.7°E / -16.2; 46.7
Approximate paleocoordinates	34°54′S37°48′E / 34.9°S 37.8°E / -34.9; 37.8
Region	Boeny, Mahajanga Province
Country	Madagascar
Extent	Mahajanga Basin
class=notpageimage| Location of the formation in Madagascar

The Ankazomihaboka Formation is a Coniacian geologic formation in the Mahajanga Basin of northwestern Madagascar. The formation comprises claystones and sandstones deposited in a fluvial to lacustrine environment. ^[1] The formation is overlain by the Marovoay Beds and overlies basalt. ^[2]

Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. ^[3]

Fossil content

• "Titanosaurus" madagascariensis
• Majungasaurus crenatissimus (theropod indet.)
• Axelrodichthys sp. ^[1]
• Ferganoceratodus madagascariensis ^[4]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera
• List of fossiliferous stratigraphic units in Madagascar
• Geology of Madagascar

References

1. MAD 96 at Fossilworks.org
2. Rogers et al., 2000, p.280
3. Weishampel, et al. (2004). "Dinosaur distribution" Pp. 517-607. in Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN   0-520-24209-2. " Pp. 517-607.
4. Challands, Tom J.; Cavin, Lionel; Zondo, Michel; Munyikwa, Darlington; Choiniere, Jonah N.; Barrett, Paul M. (2023-11-02). "A new lungfish from the Upper Triassic of the Mid-Zambezi Basin, Zimbabwe" . Journal of Vertebrate Paleontology. 43 (6) e2365391. doi: 10.1080/02724634.2024.2365391 . ISSN   0272-4634.

Bibliography

• Rogers, Raymond R.; Hartman, Joseph H.; Krause, David W. (2000), "Stratigraphic Analysis of Upper Cretaceous Rocks in the Mahajanga Basin, Northwestern Madagascar: Implications for Ancient and Modern Faunas", Journal of Geology , 108 (3): 275–301, Bibcode:2000JG....108..275R, doi:10.1086/314403, PMID   10769157 , retrieved 2018-08-30

Further reading

• Curry, K. A. 1997. Vertebrate fossils from the Upper Cre-taceous Ankazomihaboka Sandstones, Mahajanga Ba-sin, Madagascar. J. Vertebr. Paleontol. 17(suppl.):40A
• M. D. Gottfried, R. R. Rogers, and K. A. Curry Rogers. 2004. First record of Late Cretaceous coelacanths from Madagascar. Recent Advances in the Origin and Early Radiation of Vertebrates, in G. Arratia, M. V. H. Wilson, and R. Cloutier (eds.), Verlag Dr. Friedrich Pfeil, München 687-691