Where: Chouteau County, Montana (47.8° N, 109.6° W: paleocoordinates 54.9° N, 75.8° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Judith River Formation (Montana Group), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)
• 40 feet below top of formation; Judithian based on fauna
• group of beds-level stratigraphic resolution
Environment/lithology: fine channel fill; lenticular, carbonaceous claystone
Size class: mesofossils
Collected in 1964-1966; reposited in the AMNH
Collection methods: bulk, sieve,
Primary reference: A. Sahni. 1972. The vertebrate fauna of the Judith River Formation, Montana. Bulletin of the American Museum of Natural History 147(6):321-412 [J. Alroy/J. Alroy/M. Carrano]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 14446: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Matthew Carrano, Patricia Holroyd, Roger Benson and Philip Mannion
Creative Commons license: CC BY (attribution)
Taxonomic list
Actinopteri | |
? Paralbula sp. Blake 1940 | |
Belonostomus longirostris Lambe 1902 | |
Amphibia | |
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Prodesmodon copei Estes 1964 salamander | |
Anura "Unnamed genus and species I"9, Anura "indet. 1"9, Anura "indet. 3"9, cf. Scotiophryne sp.9, Hensonbatrachus kermiti9
Anura "Unnamed genus and species I"9 Fischer von Waldheim 1813 frog AMNH FARB 8460*, maxilla; = Discoglossid C of Sahni
Anura "indet. 1"9 Fischer von Waldheim 1813 frog AMNH FARB 8451*, 8464*, 33044*, maxillae; = Discoglossid B of Sahni
Hensonbatrachus kermiti9 Gardner and Brinkman 2015 frog AMNH FARB 33042*, 33043*, maxillae - Discoglossid A (in part)
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Reptilia | |
Paraderma bogerti Estes 1964 squamates | |
Exostinus lancensis Gilmore 1928 squamates | |
"Peltosaurus piger" = Odaxosaurus piger
"Peltosaurus piger" = Odaxosaurus piger Gilmore 1928 squamates | |
Parasaniwa wyomingensis Gilmore 1928 squamates | |
Leptochamops denticulatus Gilmore 1928 squamates | |
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Troodon formosus Leidy 1856 maniraptoran | |
Paronychodon lacustris Cope 1876 maniraptoran | |
Ceratopsidae indet. Marsh 1888 ceratopsid | |
"? Stegoceras validus" = Stegoceras validum
"? Stegoceras validus" = Stegoceras validum Lambe 1902 ornithischian | |
"Procheneosaurus altidens" = Trachodon altidens, "Kritosaurus cf. breviceps" = Hadrosaurus breviceps
"Procheneosaurus altidens" = Trachodon altidens Lambe 1902 hadrosaurid
"Kritosaurus cf. breviceps" = Hadrosaurus breviceps Marsh 1889 hadrosaurid | |
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Edmontonia longiceps Sternberg 1928 ankylosaur | |
? Baenidae indet. Cope 1882 turtle | |
Mammalia | |
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Gypsonictops lewisi n. sp.
Gypsonictops lewisi n. sp. Sahni 1972 eutherian | |
Alphadon attaragos2, Alphadon halleyi n. sp., Turgidodon russelli3, "Alphadon praesagus" = Turgidodon praesagus
"Alphadon praesagus" = Turgidodon praesagus Russell 1952 metatherian | |
"Pediomys clemensi n. sp." = Protolambda clemensi Sahni 1972 metatherian | |
Ectocentrocristus foxi n. sp.10
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Meniscoessus major Russell 1936 multituberculate
Cimolomys clarki Sahni 1972 multituberculate | |
"Cimexomys magnus n. sp." = Paracimexomys magnus
"Cimexomys magnus n. sp." = Paracimexomys magnus Sahni 1972 multituberculate | |
Cimolodon sp. Marsh 1889 multituberculate | |
"Mesodma primaeva" = Filikomys primaevus Lambe 1902 multituberculate "primaevus": OK according to Novacek and Clemens 1977; one specimen from "40 feet east of Clambank Hollow Quarry and on the opposite side of the gully"
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Cimexomys judithae n. sp.
Cimexomys judithae n. sp. Sahni 1972 multituberculate one specimen is Paracimexomys sp.: Montellano 1992
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Gastropoda | |
Lioplacodes judithensis snail
Viviparus sp. Montfort 1810 snail | |
Goniobasis sp. Lea snail
? Goniobasis subtortuosa snail | |
? Valvata montanensis snail | |
Bivalvia | |
Sphaerium planum fingernail clam | |
Unio sp. Philipsson 1788 freshwater mussel |