NMMNH L-6898 (Paleocene of the United States)

Where: Sandoval County, New Mexico (36.0° N, 107.2° W: paleocoordinates 42.4° N, 87.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: To3 mammal zone, Ojo Encino Member (Nacimiento Formation), Torrejonian (63.3 - 61.7 Ma)

• deposits are assigned to the Mixodectes pungens biozone, late Torrejonian (To3) North American Land

•Mammal Age. L-6898 falls within magnetochron C27N (23), constraining the absolute geochronological age to

•62.221–62.517 Ma (25).

Environment/lithology: terrestrial; siltstone

• thin (<10 cm) muddy siltstone bed of restricted areal extent (<5 square meters),

Size classes: macrofossils, mesofossils

• Locality reported to have semiarticulated skeletons of small mammals, as well as disarticulated bones and teeth from mammals, lizards, and a snake

Primary reference: D. T. Ksepka, T. A. Stidham, and T. E. Williamson. 2017. Early Paleocene landbird supports rapid phylogenetic and morphological diversification of crown birds after the K–Pg mass extinction. Proceedings of the National Academy of Sciences 114(30):8047-8052 [P. Holroyd/P. Holroyd/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 187009: authorized by Patricia Holroyd, entered by Patricia Holroyd on 11.07.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sandcoleiformes - Sandcoleidae
Tsidiiyazhi abini n. gen. n. sp.
Tsidiiyazhi abini n. gen. n. sp. Ksepka et al. 2017 bird
NMMNH P-54128, holotype
 Cimolesta - Cimolestidae
Acmeodon secans Matthew and Granger 1921 eutherian
 Primates - Palaechthonidae
Torrejonia wilsoni Gazin 1968 primate
NMMNH P-54500
 Sarcobora - Mixodectidae
Mixodectes pungens Cope 1883 insectivoran