AEM 34. Antsirasira–Ampolipoly (Cretaceous of Madagascar)

Where: Madagascar (18.4° S, 44.8° E: paleocoordinates 37.0° S, 35.8° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Pseudoschloenbachia umbulazi ammonoid zone, Late/Upper Santonian (85.8 - 83.5 Ma)

• Given as Late Santonian; However, Pseudoschloenbachia umbulazi zone is early Campanian elsewhere.

• bed-level stratigraphic resolution

Environment/lithology: marine; concretionary limestone

• A 2.5 m-thick bed with numerous concretionary horizons; huge concretions at the bottom of the bed, yielding very rich ammonite (mainly Texanites) and inoceramid faunas. This is the level with the first appearance of representatives of inoceramids of the muelleri group, referred to as Cordiceramus mitraikyensis.

Size class: macrofossils

Primary reference: I. Walaszczyk, W. J. Kennedy, K. Dembicz, A. S. Gale, T. Praszkier, A. H. Rasoamiaramanana, and H. Randrianaly. 2014. Ammonite and inoceramid biostratigraphy and biogeography of the Cenomanian through basal Middle Campanian (Upper Cretaceous) of the Morondava Basin, western Madagascar. Journal of African Earth Sciences 89:79-132 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 232218: authorized by Pete Wagner, entered by Pete Wagner on 01.11.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Muniericeratidae
Texasia besairiei, Pseudoschloenbachia umbulazi
Pseudoschloenbachia umbulazi Baily 1855 ammonite
 Ammonitida - Desmoceratidae
Hauericeras (Gardeniceras) gardeni
 Ammonitida - Collignoniceratidae
Texanites sp., Texanites collignoni, Texanites soutoni
Texanites sp. Spath 1932 ammonite
Texanites soutoni Baily 1855 ammonite
Bivalvia
 Myalinida - Inoceramidae
"Cordiceramus sp." = Inoceramus (Cordiceramus)
"Cordiceramus sp." = Inoceramus (Cordiceramus) Heinz 1932 clam