PBDB Collection

Clambank Hollow Quarry (Cretaceous to of the United States)

Where: Chouteau County, Montana (47.8° N, 109.6° W)

• Paleocoordinates: 57.7° N, 65.9° W (Wright 2013)

• coordinate stated in text

• outcrop-level geographic resolution

When: Judith River Formation (Montana Group), Middle Campanian to Middle Campanian (83.6 - 72.2 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: CC0 (CC0)

Taxonomic list

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

Show authors, comments, and common names

Gastropoda
Architaenioglossa - Viviparidae	Viviparus sp., Lioplacodes judithensis Viviparus sp. Montfort 1810 snail Lioplacodes judithensis snail
Cerithioidea - Pleuroceridae	Goniobasis sp., ? Goniobasis subtortuosa Goniobasis sp. Lea snail ? Goniobasis subtortuosa snail
Heterostropha - Valvatidae	? Valvata montanensis ? Valvata montanensis snail
Bivalvia
Unionida - Unionidae	Unio sp. Unio sp. Philipsson 1788 freshwater mussel
Cardiida - Sphaeriidae	Sphaerium planum Sphaerium planum fingernail clam
Actinopteri
Elopiformes - Phyllodontidae	? Paralbula sp. ? Paralbula sp. Blake 1940
Aspidorhynchiformes - Aspidorhynchidae	Belonostomus longirostris Belonostomus longirostris Lambe 1902
Amphibia
Temnospondyli - Albanerpetontidae	Albanerpetontidae indet.⁷ Albanerpetontidae indet.⁷ Fox and Naylor 1982 tetrapod AMNH 8479, 8480
Caudata - Urodela	Habrosaurus sp.⁸ Habrosaurus sp.⁸ Gilmore 1928 siren
Proteida - Batrachosauroididae	Prodesmodon copei Prodesmodon copei Estes 1964 salamander
Salientia -	Anura "Unnamed genus and species I"⁹, Anura "indet. 1"⁹, Anura "indet. 3"⁹, Hensonbatrachus kermiti⁹, cf. Scotiophryne sp.⁹ Anura "Unnamed genus and species I"⁹ frog AMNH FARB 8460, maxilla; = Discoglossid C of Sahni Anura "indet. 1"⁹ frog AMNH FARB 8451, 8464, 33044, maxillae; = Discoglossid B of Sahni Anura "indet. 3"⁹ frog AMNH FARB 8462, 33040, 33041, 33046, maxillae Hensonbatrachus kermiti⁹ Gardner and Brinkman 2015 frog AMNH FARB 33042, 33043, maxillae - Discoglossid A (in part) cf. Scotiophryne sp.⁹ Estes 1969 frog AMNH FARB 33045*
Reptilia
Testudinata - Baenidae	? Baenidae indet. ? Baenidae indet. Cope 1882 turtle
Theropoda -	Paronychodon lacustris Paronychodon lacustris Cope 1876 maniraptoran
Theropoda - Troodontidae	Troodon formosus Troodon formosus Leidy 1856 maniraptoran
Neornithischia - Thescelosauridae	Orodromeus makelai⁵ Orodromeus makelai⁵ Horner and Weishampel 1988 ornithischian
Ornithischia - Ceratopsidae	Ceratopsidae indet. Ceratopsidae indet. Marsh 1888 ceratopsid
Ornithischia -	"? Stegoceras validus" = Stegoceras validum "? Stegoceras validus" = Stegoceras validum Lambe 1902 ornithischian
Ornithischia - Hadrosauridae	"Kritosaurus cf. breviceps" = Hadrosaurus breviceps, "Procheneosaurus altidens" = Trachodon altidens "Kritosaurus cf. breviceps" = Hadrosaurus breviceps Marsh 1889 hadrosaurid "Procheneosaurus altidens" = Trachodon altidens Lambe 1902 hadrosaurid
Ornithischia - Nodosauridae	Edmontonia longiceps Edmontonia longiceps Sternberg 1928 ankylosaur
Squamata -	Parasaniwa wyomingensis Parasaniwa wyomingensis Gilmore 1928 squamates
Squamata - Anguidae	"Peltosaurus piger" = Odaxosaurus piger "Peltosaurus piger" = Odaxosaurus piger Gilmore 1928 squamates
Squamata - Xenosauridae	Exostinus lancensis Exostinus lancensis Gilmore 1928 squamates
Squamata -	Paraderma bogerti Paraderma bogerti Estes 1964 squamates
Squamata - Teiidae	Teiidae indet.⁶ Teiidae indet.⁶ Gray 1827 squamates AMNH 8487, 8488
Squamata - Chamopsiidae	Leptochamops denticulatus Leptochamops denticulatus Gilmore 1928 squamates
Mammalia
Multituberculata -	"Cimexomys magnus n. sp." = Paracimexomys magnus, Cimexomys judithae n. sp. "Cimexomys magnus n. sp." = Paracimexomys magnus Sahni 1972 multituberculate Cimexomys judithae n. sp. Sahni 1972 multituberculate one specimen is Paracimexomys sp.: Montellano 1992
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
Leptictida - Gypsonictopidae	Gypsonictops lewisi n. sp. Gypsonictops lewisi n. sp. Sahni 1972 eutherian
Cimolesta - Cimolestidae	Cimolestes sp.², cf. Batodon sp.² Cimolestes sp.² Marsh 1889 eutherian pers. commun. cf. Batodon sp.² Marsh 1892 eutherian pers. commun.
Tribosphenida -	Paranyctoides sp.² Paranyctoides sp.² Fox 1979 eutherian pers. commun.
Tribosphenida - Pediomyidae	"Pediomys prokrejcii" = Leptalestes prokrejcii⁴, "Pediomys clemensi n. sp." = Protolambda clemensi "Pediomys prokrejcii" = Leptalestes prokrejcii⁴ Fox 1979 metatherian "Pediomys clemensi n. sp." = Protolambda clemensi Sahni 1972 metatherian
Tribosphenida - Alphadontidae	"Alphadon praesagus" = Turgidodon praesagus, Turgidodon russelli³, Alphadon halleyi n. sp., Alphadon attaragos² "Alphadon praesagus" = Turgidodon praesagus Russell 1952 metatherian Turgidodon russelli³ Fox 1979 metatherian Alphadon halleyi n. sp. Sahni 1972 metatherian includes "A. sahnii" of Lillegraven and McKenna 1986 Alphadon attaragos² Lillegraven and McKenna 1986 metatherian pers. commun.
Tribosphenida - Stagodontidae	Eodelphis sp.¹ Eodelphis sp.¹ Matthew 1916 metatherian
Polydolopimorphia -	Ectocentrocristus foxi n. sp.¹⁰ Ectocentrocristus foxi n. sp.¹⁰ Rigby and Wolberg 1987 metatherian

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