San Juan Basin (non-specific): Puercan, New Mexico
collected by D. Baldwin, Cope 1881, 1884

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Procreodi - Arctocyonidae
Arctocyon ferox (Cope 1883)
Kondrashov and Lucas 2004
Reptilia - Testudines
Aspideretes vegetus n. sp. Gilmore 1919
Vitek and Joyce 2015
recombined as Plastomenus vegetus
USNM 8539 - type
Reptilia - Testudines - Trionychidae
Amyda eloisae n. sp. Gilmore 1919
Vitek and Joyce 2015
recombined as Trionyx eloisae
USNM 8540 - type
Aspideretes reesidei n. sp. Gilmore 1919
Vitek and Joyce 2015
recombined as Trionyx reesidei
USNM 8537 - type
Reptilia
Helagras prisciformis n. gen., n. sp. Cope 1883
1 specimen
AMNH 1628 (holotype), two posterior thoracic vertebrae; AMNH 1629, about 90 anterior and posterior thoracic vertebrae
see common names

Geography
Country:United States State/province:New Mexico County:San Juan
Coordinates: 36.3° North, 108.1° West (view map)
Paleocoordinates:43.2° North, 87.2° West
Basis of coordinate:estimated from map
Time
Period:Paleogene Epoch:Paleocene
Stage:Danian 10 m.y. bin:Cenozoic 1
Key time interval:Puercan
Age range of interval:66.00000 - 63.30000 m.y. ago
Stratigraphy
Formation:Nacimiento
Stratigraphic resolution:group of beds
Lithology and environment
Primary lithology: not reported
Includes fossils?Y
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Collectors:D. Baldwin, Cope Collection dates:1881, 1884
Taxonomic list comments:Locality not given for AMNH specimen, but probably NM since it's "Puerco Fm". - Gilmore 1938
Metadata
Also known as:Helagras prisciformes type locality
Database number:125183
Authorizer:M. Uhen, P. Barrett, J. Marcot, P. Mannion Enterer:M. Shalap, P. Mannion, T. Cleary, J. Marcot
Modifier:P. Mannion
Created:2012-03-06 08:25:43 Last modified:2021-06-02 06:11:12
Access level:the public Released:2012-03-06 08:25:43
Creative Commons license:CC BY
Reference information

Primary reference:

14699. C. W. Gilmore. 1938. Fossil snakes of North America. Geological Society of America Special Paper (9)1-96 [J. Head/J. Head]

Secondary references:

76629 P. E. Kondrashov and S. G. Lucas. 2004. Arctocyon from the Paleocene of North America. In S. G. Lucas, K. E. Zeigler, and P. E. Kondrashov (eds.), Paleogene Mammals 11-20 [J. Marcot/J. Marcot]
77033 T. R. Lyson, H. Petermann, and I. M. Miller. 2021. A new plastomenid trionychid turtle, Plastomenus joycei, sp. nov., from the earliest Paleocene (Danian) Denver Formation of south-central Colorado, U.S.A. Journal of Vertebrate Paleontology e1913600:1-11 [E. Vlachos/E. Vlachos/P. Mannion]
63467 N. S. Vitek and W. G. Joyce. 2015. A Review of the Fossil Record of New World Turtles of the Clade Pan-Trionychidae. Bulletin of the Peabody Museum of Natural History 56(2):185-244 [P. Mannion/P. Mannion]