Clambank Hollow Quarry: Middle Campanian - Late/Upper Campanian, Montana
collected 1964-1966

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Amphibia - Temnospondyli
Anura informal Unnamed genus and species I
Gardner et al. 2016 1 specimen
AMNH FARB 8460*, maxilla; = Discoglossid C of Sahni
Anura informal indet. 1 (Fischer von Waldheim 1813)
Gardner et al. 2016 3 specimens
AMNH FARB 8451*, 8464*, 33044*, maxillae; = Discoglossid B of Sahni
Anura informal indet. 3 (Fischer von Waldheim 1813)
Gardner et al. 2016 4 specimens
AMNH FARB 8462*, 33040*, 33041*, 33046*, maxillae
cf. Scotiophryne sp. Estes 1969
Gardner et al. 2016 1 specimen
AMNH FARB 33045*
Hensonbatrachus kermiti Gardner and Brinkman 2015
Gardner et al. 2016 2 specimens
AMNH FARB 33042*, 33043*, maxillae - Discoglossid A (in part)
Amphibia - Temnospondyli - Urodela
Habrosaurus dilatus Gilmore 1928
1 specimen
    = Habrosaurus sp. Gilmore 1928
Gardner 2003
AMNH 8477-8478 (fragmentary dentaries)
Amphibia - Temnospondyli - Batrachosauroididae
Prodesmodon copei Estes 1964
Amphibia - Temnospondyli - Albanerpetontidae
Albanerpetontidae indet. Fox and Naylor 1982
Gardner 2000 2 specimens
AMNH 8479, 8480
Reptilia - Nodosauridae
Edmontonia longiceps Sternberg 1928
1 specimen
Reptilia - Ceratopsidae
Ceratopsidae indet. Marsh 1888
Reptilia
? Stegoceras validus Lambe 1902
corrected as Stegoceras validum
Thescelosaurus cf. neglectus Gilmore 1913
    = Orodromeus makelai Horner and Weishampel 1988
Galton 1995
Reptilia - Hadrosauridae
Procheneosaurus altidens (Lambe 1902)
14 specimens
nomen dubium belonging to Hadrosauridae
Kritosaurus cf. breviceps (Marsh 1889)
nomen dubium belonging to Hadrosauridae
Reptilia
Paronychodon lacustris Cope 1876
nomen dubium belonging to Paronychodon
Reptilia - Troodontidae
Troodon formosus Leidy 1856
Reptilia - Teiidae
Chamops segnis Marsh 1892
2 specimens
AMNH 8487, 8488
    = Teiidae indet. Gray 1827
Gao and Fox 1996
AMNH 8487, 8488
Reptilia - Chamopsiidae
Leptochamops denticulatus (Gilmore 1928)
2 specimens
Reptilia - Xenosauridae
Exostinus lancensis Gilmore 1928
1 specimen
Reptilia
Paraderma bogerti Estes 1964
1 specimen
Parasaniwa wyomingensis Gilmore 1928
2 specimens
Reptilia - Anguidae
Peltosaurus piger Gilmore 1928
2 specimens
recombined as Odaxosaurus piger
Reptilia - Baenidae
? Baenidae indet. Cope 1882
Mammalia - Multituberculata
Cimexomys magnus n. sp. Sahni 1972
recombined as Paracimexomys magnus
Mammalia - Multituberculata - Cimolomyidae
Cimolomys clarki Sahni 1972
Meniscoessus major (Russell 1936)
Mammalia - Multituberculata - Neoplagiaulacidae
Mesodma primaeva (Lambe 1902)
recombined as Filikomys primaevus
"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. Jepsen 1940
Carrano 1999
pers. commun.
Mammalia - Multituberculata - Cimolodontidae
Cimolodon sp. Marsh 1889
Mammalia - Multituberculata
Cimexomys judithae n. sp. Sahni 1972
one specimen is Paracimexomys sp.: Montellano 1992
Mammalia - Gypsonictopidae
Gypsonictops lewisi n. sp. Sahni 1972
Mammalia
Paranyctoides sp. Fox 1979
Carrano 1999
pers. commun.
Mammalia - Cimolestidae
cf. Batodon sp. Marsh 1892
Carrano 1999
pers. commun.
Cimolestes sp. Marsh 1889
Carrano 1999
pers. commun.
Mammalia - Stagodontidae
Boreodon matutinus Lambe 1902
    = Eodelphis sp. Matthew 1916
Alroy 2002
Mammalia - Pediomyidae
Pediomys clemensi n. sp. Sahni 1972
recombined as Protolambda clemensi
Pediomyidae indet. (Simpson 1927)
    = Pediomys prokrejcii Fox 1979
Fox 1979
recombined as Leptalestes prokrejcii
Mammalia - Alphadontidae
Alphadon attaragos Lillegraven and McKenna 1986
Carrano 1999
pers. commun.
Alphadon halleyi n. sp. Sahni 1972
includes "A. sahnii" of Lillegraven and McKenna 1986 (1 measurement)
Turgidodon russelli (Fox 1979)
Cifelli 1990
Alphadon praesagus (Russell 1952)
recombined as Turgidodon praesagus
Mammalia
Alphadon cf. rhaister Clemens 1966
    = Ectocentrocristus foxi n. sp. Rigby and Wolberg 1987
Rigby and Wolberg 1987
recognized as not belonging to this genus by Fox 1979a
Actinopteri - Elopiformes - Phyllodontidae
? Paralbula sp. Blake 1940
Actinopteri - Aspidorhynchiformes - Aspidorhynchidae
Belonostomus longirostris (Lambe 1902)
1 specimen
Gastropoda - Heterostropha - Valvatidae
? Valvata montanensis
Gastropoda - Pleuroceridae
Goniobasis sp. Lea
? Goniobasis subtortuosa
Gastropoda - Viviparidae
Lioplacodes judithensis
Viviparus sp. Montfort 1810
Bivalvia - Cardiida - Sphaeriidae
Sphaerium planum
Bivalvia - Unionida - Unionidae
Unio sp. Philipsson 1788
see common names

Geography
Country:United States State/province:Montana County:Chouteau
Coordinates: 47.8° North, 109.6° West (view map)
Paleocoordinates:54.9° North, 75.8° West
Basis of coordinate:stated in text
Altitude:945 meters
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
*Epoch:Senonian
Key time interval:Middle Campanian - Late/Upper Campanian
Age range of interval:83.60000 - 72.10000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Montana Formation:Judith River
Stratigraphic resolution:group of beds
Stratigraphy comments: 40 feet below top of formation; Judithian based on fauna
Lithology and environment
Primary lithology:lenticular carbonaceous claystone
Includes fossils?Y
Lithology description: "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."
Environment:fine channel fill
Geology comments: "river meander or oxbow lake"
Taphonomy
Modes of preservation:body
Lagerst�tten type:concentrate
Degree of concentration:concentrated
Size of fossils:mesofossils
Spatial orientation:random
Preservation of anatomical detail:good
Disassociated major elements:many
Disassociated minor elements:many
Fragmentation:occasional
Temporal resolution:time-averaged
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:bulk,sieve,field collection
Collection size:268 specimens
Reason for describing collection:general faunal/floral analysis
Museum repositories:AMNH
Collection dates:1964-1966
Taxonomic list comments:"about 75 Ma" according to Swisher AA date: Rogers pers. commun. 15.4.94NISP 268
Metadata
Database number:14446
Authorizer:J. Alroy, R. Benson, P. Mannion, M. Carrano, P. Holroyd Enterer:J. Alroy, R. Benson, M. Carrano, P. Mannion, P. Holroyd
Modifier:M. Carrano Research group:vertebrate
Created:1994-04-30 00:00:00 Last modified:2016-05-18 15:31:59
Access level:the public Released:1994-04-30 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
3008. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
6327 M. T. Carrano. 1999. Personal communication regarding Clambank Hollow Quarry. [J. Alroy/J. Alroy/J. Alroy]
1205 R. L. Cifelli. 1990. Cretaceous mammals from southern Utah. I. Marsupials from the Kaiparowits Formation (Judithian). Journal of Vertebrate Paleontology 10(3):295-319 [J. Alroy/J. Alroy/M. Carrano]
1518 R. C. Fox. 1979. Mammals from the Upper Cretaceous Oldman Formation, Alberta. II. Pediomys Marsh (Marsupialia). Canadian Journal of Earth Sciences 16:103 [J. Alroy/J. Alroy/J. Ju]
12971ETE P. M. Galton. 1995. The species of the basal hypsilophodontid dinosaur Thescelosaurus Gilmore (Ornithischia: Ornithopoda) from the Late Cretaceous of North America. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 198(3):297-311 [M. Carrano/M. Carrano/M. Carrano]
37933 K. -Q. Gao and R. C. Fox. 1996. Taxonomy and evolution of Late Cretaceous lizards (Reptilia: Squamata) from western Canada. Bulletin of the Carnegie Museum of natural History 33:1-107 [R. Benson/R. Benson]
42675 J. D. Gardner. 2000. Albanerpetontid amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America. Geodiversitas 22(3):349-388 [M. Carrano/M. Carrano/M. Carrano]
42825 J. D. Gardner. 2003. Revision of Habrosaurus Gilmore (Caudata; Sirenidae) and relationships among sirenid salamanders. Palaeontology 46(6):1089-1122 [P. Mannion/P. Mannion/M. Carrano]
64015 J. D. Gardner, C. M. Redman, and R. L. Cifelli. 2016. The hopping dead: Late Cretaceous frogs from the middle-late Campanian (Judithian) of western North America. Fossil Imprint 72(1-2):78-107 [P. Holroyd/P. Holroyd/M. Carrano]
2907 J. K. Rigby, Jr. and D. L. Wolberg. 1987. The therian mammalian fauna (Campanian) of Quarry 1, Fossil Forest study area, San Juan Basin, New Mexico. Geological Society of America Special Paper 209:51-79 [J. Alroy/J. Alroy/M. Uhen]
14450ETE T. E. Williamson and T. D. Carr. 2003. A new genus of derived pachycephalosaurian from western North America. Journal of Vertebrate Paleontology 22(4):779-801 [M. Carrano/M. Carrano/J. Alroy]