Also known as Angyomphalus-Glabrocingulum assemblage, Tsingyuan Fm. (Lower Mbr.), Ningxia, Chi

Where: Ningxia, China (37.5° N, 105.7° E: paleocoordinates 9.9° N, 66.6° E)

• coordinate estimated from map

When: Eumorphoceras zone, Lower Member (Tsingyuan Formation), Arnsbergian (327.0 - 323.7 Ma)

• Eumorphoceras = top of Arnsbergian;

•"This assemblage is associated with the ammonoids Dombarites paratectus and Cravenoceous arcticun, which are considered equivalent to the upper part of West European E, zone or Nmlb of pre-Russian (Ruan and Zhou, 1987). The conodonts Gnathodus bilinensis bilinensis, Paragnathodus commutadus, and P. mononodosus also occur; they characterize the West European E (Eumorphoceras) zone (Wang 1987)."

• member-level stratigraphic resolution

Environment/lithology: marine; gray sandstone and shale

Collection methods: "These specimens weathered out of an argillaceous limestone."

Primary reference: H. Pan. 1997. Namurian (Lower Carboniferous) gastropod assemblages from Ningxia, China. Journal of Paleontology 71(4):599-609 [J. Alroy/M. Sommers/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 671: authorized by John Alroy, entered by Mike Sommers on 17.02.1999

Creative Commons license: CC BY (attribution)