| 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′S 46°42′E / 16.2°S 46.7°E / -16.2; 46.7 |
| Approximate paleocoordinates | 34°54′S 37°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. The formation is overlain by the Marovoay Beds and overlies basalt.
Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.
Fossil content
- "Titanosaurus" madagascariensis
- Majungasaurus crenatissimus (theropod indet.)
- Axelrodichthys sp.
- Ceratodus madagascariensis
See also
- List of dinosaur-bearing rock formations
- List of fossiliferous stratigraphic units in Madagascar
- Geology of Madagascar
References
- ^ MAD 96 at Fossilworks.org
- Rogers et al., 2000, p.280
- 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.
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