West Fork of Gallegos Canyon (Paleocene of the United States)

Also known as Sinclair and Granger Loc. 4; Five miles northwest of Ojo Alamo; LACM 5400; Pina Verta Canyon

Where: San Juan County, New Mexico (36.3° N, 108.2° W: paleocoordinates 43.2° N, 87.3° W)

• coordinate based on political unit

When: Nacimiento Formation, Puercan (66.0 - 63.3 Ma)

Environment/lithology: terrestrial

Reposited in the LACM

Primary reference: S. G. Lucas. 1984. Early Paleocene vertebrates, stratigraphy and biostratigraphy, West Fork of Gallegos Canyon, San Juan Basin, New Mexico. New Mexico Geology 6(3):56-60 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14795: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• identical to list 6 of Williamson 1996
several records are omitted by Williamson and Lucas 1993
it appears that there are also Torrejonian strata in Gallegos Canyon ("Chico Springs"), represented in AMNH collections; some i.d.s separated out as a second list (see)
multiple localities from a single 1 m thick black sandstone; virtually every specimen is from a different UNM locality
section is entirely reversed, hard to correlate to paleomag time scale as base should encompass 29N; possibility that the entire section represents 29R is not discussed
 Condylarthra -
Desmatoclaenus protogonioides2 Cope 1882 placental
Desmatoclaenus dianae2 Van Valen 1978 placental
 Theriamorpha - Periptychidae
Periptychus coarctatus Cope 1883 condylarth
Mithrandir gillianus1 Cope 1882 condylarth
 Procreodi - Arctocyonidae
Loxolophus pentacus Cope 1888 condylarth
Loxolophus hyattianus Cope 1885 condylarth
Loxolophus priscus Cope 1888 condylarth
 Multituberculata - Taeniolabididae
Taeniolabis taoensis Cope 1882 multituberculate
includes AMNH "Polymastodon" specimens of Sinclair and Granger 1914