Judith River badlands (USGS) (Cretaceous to of the United States)

Where: Fergus County, Montana (47.7° N, 109.6° W: paleocoordinates 54.8° N, 75.9° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Judith River Formation (Montana Group), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by F. v. Hayden in the 1850s; reposited in the ANSP, USGS

Collection methods: surface (float),

Primary reference: J. Leidy. 1856. Notices of remains of extinct reptiles and fishes, discovered by Dr. F. V. Hayden in the bad lands of the Judith River, Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:72-73 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69213: authorized by Matthew Carrano, entered by Matthew Carrano on 21.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Actinopteri
 Lepisosteiformes -
Lepidotus haydeni n. sp. Leidy 1856 gar
Lepidotus occidentalis n. sp. Leidy 1856 gar
Reptilia
 Testudines - Trionychidae
Trionyx foveatus n. sp. Leidy 1856 softshell turtle
 Avetheropoda - Troodontidae
Troodon formosus n. gen. n. sp.
Troodon formosus n. gen. n. sp. Leidy 1856 coelurosaur
 Avetheropoda -
Deinodon horridus n. gen. n. sp.
Deinodon horridus n. gen. n. sp. Leidy 1856 coelurosaur
 Ornithischia -
Palaeoscincus costatus n. gen. n. sp.
Palaeoscincus costatus n. gen. n. sp. Leidy 1856 ornithischian
 Neornithischia - Hadrosauridae
Trachodon mirabilis n. gen. n. sp.
Trachodon mirabilis n. gen. n. sp. Leidy 1856 hadrosaurid
ANSP 9260
 Loricata -
Crocodilus humilis Leidy 1856 crocodilian