Hidden Valley Quarry (HVQ) (Cretaceous to of the United States)

Where: Golden Valley County, Montana (46.5° N, 109.3° W: paleocoordinates 53.5° N, 76.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Judithian based on fauna

• group of beds-level stratigraphic resolution

Environment/lithology: levee; fine-grained, medium, gray sandstone and burrowed, bioturbated siltstone

• "tracks are preserved in a finely laminated dark gray siltstone...[that] occurs within a sequence of alternating light to medium gray, fine- to medium-grained sandstones and dark gray silststones."

Size classes: macrofossils, mesofossils

Preservation: mold/impression, trace

Primary reference: A. R. Fiorillo. 1989. The vertebrate fauna from the Judith River Formation (Late Cretaceous) of Wheatland and Golden Valley counties, Montana. Mosasaur 4:127-142 [J. Alroy/J. Alroy/H. Street]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14462: authorized by John Alroy, entered by John Alroy on 21.09.1998, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodus sp.3 Agassiz 1837 elasmobranch
 Myliobatiformes - Dasyatidae
Myledaphus sp.3 Cope 1876 whiptail stingray
 Lamniformes - Cretoxyrhinidae
Cretolamna sp.3 Glikman 1958 mackerel shark
 Lamniformes - Odontaspididae
Carcharias sp.3 Rafinesque 1810 sand shark
Actinopteri
 Acipenseriformes - Acipenseridae
Acipenser sp. Linnaeus 1758 sturgeon
 Elopiformes - Phyllodontidae
Paralbula sp. Blake 1940
Reptilia
 Testudines - Trionychidae
Trionychinae indet.2 softshell turtle
 Testudines - Baenidae
Boremys sp.3 Lambe 1906 turtle
 Testudines - Nanhsiungchelyidae
Basilemys sp.4 Hay 1902 turtle
tracks
 Testudines - Adocidae
Adocus sp.3 Cope 1868 turtle
 Theropoda -
Theropoda "indet. A"3 theropod
"A"
 Avetheropoda - Dromaeosauridae
Richardoestesia gilmorei4 Currie et al. 1990 coelurosaur
Saurornitholestes langstoni4 Sues 1978 coelurosaur
Dromaeosaurus albertensis4 Matthew and Brown 1922 coelurosaur
 Avetheropoda - Troodontidae
Troodon formosus4 Leidy 1856 coelurosaur
 Avetheropoda - Ornithomimidae
Ornithomimidae indet. Marsh 1890 ornithomimid
 Neornithischia - Hadrosauridae
Hadrosaurinae indet. Lambe 1918 hadrosaurine
 Pterosauria - Azhdarchidae
Azhdarchidae indet. Nessov 1984 pterosaur
Mammalia
 Theriiformes -
Metatheria indet.1 Huxley 1880 metatherian
 Didelphimorphia - Stagodontidae
Eodelphis sp.3 Matthew 1916 marsupial