Wadi Zamzam, western Hammada al Hamra desert (Cretaceous of Libya)

Where: Libya (31.1° N, 13.2° E: paleocoordinates 19.6° N, 10.2° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Omphalocyclus macroporus foram zone, Lower Tar Member (Zimam Formation), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Upper portion (unit 8 of Salaj & Nairn 1987) of the Lower Tár Member (Zimam Formation), of late Maastrichtian age (Omphalocyclus macroporus Zone). Corresponds to the Gansserina gansseri, Abathomphalus mayaroensis and Falsotruncana falsocalcarata zones of the planktic foraminifera scheme. Located about 35 m below the base of massive limestones of the Danian Hád Member.

• bed-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, shelly/skeletal packstone

• Lagoonal, barrier and open marine settings. The two last-named settings are characterised by a mass occurrence of thick-shelled oysters and large orbitoid foraminifera accompanied by other fully marine invertebrates, including irregular echinoids and rare ammonites.
• Marly oyster and gastropod coquina, compose of shells of exogyrine oysters and recrystallized gastropods, set in a marly calcarenite matrix

Size class: macrofossils

Collection methods: Repository: Institute of Paleobiology, Polish Academy of Sciences, Warszawa

Primary reference: M. Machalski, J. W. M. Jagt, N. H. Landman and J. Uberna. 2009. First record of the North American scaphitid ammonite Discoscaphites iris from the upper Maastrichtian of Libya. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 254:373-378 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 208625: authorized by Matthew Clapham, entered by Matthew Clapham on 07.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Scaphitidae
Discoscaphites iris
Discoscaphites iris Conrad 1858 ammonite