PBDB Collection

Clambank Hollow Quarry (Cretaceous to of the United States)

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

• "river meander or oxbow lake"

• "a crescentic lens rapidly pinching out to the E and dipping very steeply to the W...2 feet in thickness and can be divided into two parts, a lower subdivision not more than 6 inches thick which is very rich in bones, and an upper extremely well indurated subdivision with less bone concentration. Both lenses contain coal lenticles and plant debris."

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

• "about 75 Ma" according to Swisher AA date: Rogers pers. commun. 15.4.94NISP 268

Show authors, comments, and common names

Amphibia
Salientia -	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 Anura "indet. 3"⁹ Fischer von Waldheim 1813 frog AMNH FARB 8462, 33040, 33041, 33046, maxillae cf. Scotiophryne sp.⁹ Estes 1969 frog AMNH FARB 33045* Hensonbatrachus kermiti⁹ Gardner and Brinkman 2015 frog AMNH FARB 33042, 33043, maxillae - Discoglossid A (in part)
Caudata - Urodela	Habrosaurus sp.⁸ Habrosaurus sp.⁸ Gilmore 1928 siren
Proteida - Batrachosauroididae	Prodesmodon copei Prodesmodon copei Estes 1964 salamander
Temnospondyli - Albanerpetontidae	Albanerpetontidae indet.⁷ Albanerpetontidae indet.⁷ Fox and Naylor 1982 tetrapod AMNH 8479, 8480
Reptilia
Ornithischia - Nodosauridae	Edmontonia longiceps Edmontonia longiceps Sternberg 1928 ankylosaur
Ornithischia - Ceratopsidae	Ceratopsidae indet. Ceratopsidae indet. Marsh 1888 ceratopsid
Ornithischia -	"? Stegoceras validus" = Stegoceras validum, Orodromeus makelai⁵ "? Stegoceras validus" = Stegoceras validum Lambe 1902 ornithischian Orodromeus makelai⁵ Horner and Weishampel 1988 ornithopod
Ornithischia - Hadrosauridae	"Procheneosaurus altidens" = Trachodon altidens, "Kritosaurus cf. breviceps" = Hadrosaurus breviceps "Procheneosaurus altidens" = Trachodon altidens Lambe 1902 hadrosaurid "Kritosaurus cf. breviceps" = Hadrosaurus breviceps Marsh 1889 hadrosaurid
Theropoda -	Paronychodon lacustris Paronychodon lacustris Cope 1876 maniraptoran
Theropoda - Troodontidae	Troodon formosus Troodon formosus Leidy 1856 maniraptoran
Squamata - Teiidae	Teiidae indet.⁶ Teiidae indet.⁶ Gray 1827 squamates AMNH 8487, 8488
Squamata - Chamopsiidae	Leptochamops denticulatus Leptochamops denticulatus Gilmore 1928 squamates
Squamata - Xenosauridae	Exostinus lancensis Exostinus lancensis Gilmore 1928 squamates
Squamata -	Paraderma bogerti, Parasaniwa wyomingensis Paraderma bogerti Estes 1964 squamates Parasaniwa wyomingensis Gilmore 1928 squamates
Squamata - Anguidae	"Peltosaurus piger" = Odaxosaurus piger "Peltosaurus piger" = Odaxosaurus piger Gilmore 1928 squamates
Testudinata - Baenidae	? Baenidae indet. ? Baenidae indet. Cope 1882 turtle
Mammalia
Multituberculata -	"Cimexomys magnus n. sp." = Paracimexomys magnus "Cimexomys magnus n. sp." = Paracimexomys magnus Sahni 1972 multituberculate
Multituberculata - Cimolomyidae	Cimolomys clarki, Meniscoessus major Cimolomys clarki Sahni 1972 multituberculate Meniscoessus major Russell 1936 multituberculate
Multituberculata - Neoplagiaulacidae	"Mesodma primaeva" = Filikomys primaevus, Mesodma sp.² "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" Mesodma sp.² Jepsen 1940 multituberculate pers. commun.
Multituberculata - Cimolodontidae	Cimolodon sp. Cimolodon sp. Marsh 1889 multituberculate
Multituberculata -	Cimexomys judithae n. sp. Cimexomys judithae n. sp. Sahni 1972 multituberculate one specimen is Paracimexomys sp.: Montellano 1992
Theriamorpha - Gypsonictopidae	Gypsonictops lewisi n. sp. Gypsonictops lewisi n. sp. Sahni 1972 eutherian
Theriamorpha -	Paranyctoides sp.² Paranyctoides sp.² Fox 1979 eutherian pers. commun.
Cimolesta - Cimolestidae	cf. Batodon sp.², Cimolestes sp.² cf. Batodon sp.² Marsh 1892 eutherian pers. commun. Cimolestes sp.² Marsh 1889 eutherian pers. commun.
Theriamorpha - Stagodontidae	Eodelphis sp.¹ Eodelphis sp.¹ Matthew 1916 metatherian
Theriamorpha - Pediomyidae	"Pediomys clemensi n. sp." = Protolambda clemensi, "Pediomys prokrejcii" = Leptalestes prokrejcii⁴ "Pediomys clemensi n. sp." = Protolambda clemensi Sahni 1972 metatherian "Pediomys prokrejcii" = Leptalestes prokrejcii⁴ Fox 1979 metatherian
Theriamorpha - Alphadontidae	Alphadon attaragos², Alphadon halleyi n. sp., Turgidodon russelli³, "Alphadon praesagus" = Turgidodon praesagus Alphadon attaragos² Lillegraven and McKenna 1986 metatherian pers. commun. Alphadon halleyi n. sp. Sahni 1972 metatherian includes "A. sahnii" of Lillegraven and McKenna 1986 Turgidodon russelli³ Fox 1979 metatherian "Alphadon praesagus" = Turgidodon praesagus Russell 1952 metatherian
Polydolopimorphia -	Ectocentrocristus foxi n. sp.¹⁰ Ectocentrocristus foxi n. sp.¹⁰ Rigby and Wolberg 1987 metatherian
Actinopteri
Elopiformes - Phyllodontidae	? Paralbula sp. ? Paralbula sp. Blake 1940
Aspidorhynchiformes - Aspidorhynchidae	Belonostomus longirostris Belonostomus longirostris Lambe 1902
Gastropoda
Heterostropha - Valvatidae	? Valvata montanensis ? Valvata montanensis snail
Cerithioidea - Pleuroceridae	Goniobasis sp., ? Goniobasis subtortuosa Goniobasis sp. Lea snail ? Goniobasis subtortuosa snail
Architaenioglossa - Viviparidae	Lioplacodes judithensis, Viviparus sp. Lioplacodes judithensis snail Viviparus sp. Montfort 1810 snail
Bivalvia
Cardiida - Sphaeriidae	Sphaerium planum Sphaerium planum fingernail clam
Unionida - Unionidae	Unio sp. Unio sp. Philipsson 1788 freshwater mussel

¹Alroy 2002; ²Carrano 1999; ³Cifelli 1990; ⁴Fox 1979; ⁵Galton 1995; ⁶Gao and Fox 1996; ⁷Gardner 2000; ⁸Gardner 2003; ⁹Gardner et al. 2016; ¹⁰Rigby and Wolberg 1987