PBDB Collection

San Juan Basin (non-specific) (Paleocene of the United States)

Also known as Helagras prisciformes type locality

Where: San Juan County, New Mexico (36.3° N, 108.1° W: paleocoordinates 43.2° N, 87.2° W)

• coordinate estimated from map

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

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by D. Baldwin, Cope in 1881, 1884

Primary reference: C. W. Gilmore. 1938. Fossil snakes of North America. Geological Society of America Special Paper (9)1-96 [J. Head/J. Head]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 125183: authorized by Mark Uhen, entered by Margaret Shalap on 06.03.2012, edited by Terri Cleary, Philip Mannion and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Locality not given for AMNH specimen, but probably NM since it's "Puerco Fm". - Gilmore 1938

Show authors, comments, and common names

Reptilia
Squamata -	Helagras prisciformis n. gen. n. sp. Helagras prisciformis n. gen. n. sp. Cope 1883 snake AMNH 1628 (holotype), two posterior thoracic vertebrae; AMNH 1629, about 90 anterior and posterior thoracic vertebrae
Testudines - Trionychidae	"Amyda eloisae n. sp." = Trionyx eloisae², "Aspideretes reesidei n. sp." = Trionyx reesidei² "Amyda eloisae n. sp." = Trionyx eloisae² Gilmore 1919 softshell turtle USNM 8540 - type "Aspideretes reesidei n. sp." = Trionyx reesidei² Gilmore 1919 softshell turtle USNM 8537 - type
Testudines - Pantrionychidae	"Aspideretes vegetus n. sp." = Plastomenus vegetus² "Aspideretes vegetus n. sp." = Plastomenus vegetus² Gilmore 1919 turtle USNM 8539 - type
Mammalia
Procreodi - Arctocyonidae	Arctocyon ferox¹ Arctocyon ferox¹ Cope 1883 condylarth

¹Kondrashov and Lucas 2004; ²Vitek and Joyce 2015