west of Ambondromamy (Jurassic of Madagascar)

Where: Mahajanga, Madagascar (16.4° S, 47.1° E: paleocoordinates 23.9° S, 25.3° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Isalo IIIb Formation, Bathonian (168.3 - 166.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: coastal; claystone and sandstone

• "deposited under continental to brackish conditions"
• The formation is made up of "variegated clays and sandstones" with "fossiliferous marine intercalations"

Size classes: macrofossils, mesofossils

Collected by Descouens in 2001

Collection methods: quarrying, mechanical,

• ref 29608: "During the 2001 field survey, local collectors reported the fortuitous finding on the surface, in the neighbourhood of the village of Ambondromamy (Fig. 3), of two cranial fragments with well preserved teeth still in place, belonging to two different kinds of fossil reptiles. After several events, the two cranial fragments were acquired in Europe by Gilles Emringer and Francois Escuillié of the Eldoniasociety of Gannat, France, with the purpose to make them available for scientific description. The first specimen, a sauropod mandibular fragment now housed in the Toulouse Natural History Museum, was studied by E. Buffetaut (Buffetaut, 2005). G. Pasini was able to see the second specimen in June 2003 and to recognize that the teeth still implanted in the bone were identical to the teeth he had collected in the field in the meantime, during the prospecting activity in April 2003. Therefore the Museo Civico di Storia Naturale di Milano acquired the specimen, in order to study it together with the isolated teeth collected around the same area."

Primary reference: E. Buffetaut. 2005. A new sauropod dinosaur with prosauropod-like teeth from the Middle Jurassic of MadagascarBulletin de la Societé Géologique de France. Bulletin de la Societé Géologique de France 176(5):467-473 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 55884: authorized by Matthew Carrano, entered by Kaitlin Maguire on 07.11.2005, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Loricata -
Razanandrongobe sakalavae n. gen. n. sp. Maganuco et al. 2006 crocodilian
MSNM V5770
 Saurischia -
Archaeodontosaurus descouensi n. gen. n. sp. Buffetaut 2005 sauropod
MHNDPal 2003-396