Also known as Meiconodon lii holotype

Where: Liaoning, China (42.0° N, 121.7° E: paleocoordinates 46.5° N, 118.9° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Fuxin Formation (Jehol Group), Aptian to Aptian (125.0 - 100.5 Ma)

• Depositional ages of the Fuxin and Shahai formations remain ambiguous, because neither reliable radiometric ages nor available index fossils have been reported from either of the formations. On the other hand, from the underlying Jehol Group, radiometric ages of 120 to 130 Ma have been reported by several authors (e.g., Eberth et al., 1993; Smith et al., 1995; Swisher et al., 1999, 2001;Wang S.-S. et al., 2001a, b; He et al., 2004), and the group is now generally thought to be Barremian to Aptian in age (Gradstein et al., 2004). Based on this age correlation of the underlying Jehol Group, the Fuxin and Shahai formations are interpreted to be of Aptian or younger age, because the Shahai Formation conformably or unconformably overlies the Jiufotang Formation, and the Fuxin Formation overlies the Shahai Formation with conformity. Although there is no secure evidence to constrain a younger limit for the depositional age of the Shahai and Fuxin formations, we tentatively attribute them to the Aptian to Albian, taking account of their stratigraphic relationships with the underlying Jehol Group.

• formation-level stratigraphic resolution

Environment/lithology: alluvial fan; coal

Size classes: macrofossils, mesofossils

Reposited in the IVPP

Primary reference: N. Kusuhashi, Y. Hu, Y. Wang, S. Hirasawa, and H. Matsuoka. 2009. New triconodontids (Mammalia) from the Lower Cretaceous Shahai and Fuxin formations, northeastern China. Geobios 42:765-781 [R. Benson/R. Benson/J. Tennant]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123517: authorized by Roger Benson, entered by Roger Benson on 25.01.2012, edited by Mark Uhen

Creative Commons license: CC BY (attribution)