Mile 175 (SDSM V931) (Jurassic to of the United States)

Where: Crook County, Wyoming (44.5° N, 104.7° W: paleocoordinates 39.8° N, 50.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Morrison Formation, Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)

• close to top of formation

• bed-level stratigraphic resolution

Environment/lithology: wet floodplain; lithology not reported

• poorly drained floodplain

Size classes: macrofossils, mesofossils

Reposited in the SDSM

Collection methods: bulk, surface (float), sieve,

Primary reference: J. R. Foster and K. C. Trujillo. 2000. New occurrences of Cteniogenys (Reptilia, Choristodera) in the Late Jurassic of Wyoming and South Dakota. Brigham Young University Geology Studies 45:11-18 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56165: authorized by Matthew Carrano, entered by Matthew Carrano on 14.11.2005, edited by Philip Mannion and Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Amioid indet.2
Scales; includes MWC 5276
Vertebrata indet.2 Lamarck 1801
Includes seven small vertebrae, one small caudal vertebra, five possible eggshell fragments, all probably from indeterminate reptiles, and about 25 angular to rounded fragments of larger bones, possibly belonging to dinosaurs. Finally, there are more than 100 fragmentary vertebrate specimens that could not be identified further; these include small vertebrae, teeth, phalanges, and limb bone fragments
Gnathostomata
  -
Osteichthyes indet.2 bony fish
MWC 5854 (tooth); "It is unknown for certain whether this is an actinopterygian tooth element, a dipnoan tooth, or something else"
Osteichthyes
 Actinopterygii -
Actinopterygii " indet. A "2 Cope 1887 ray-finned fish
Gnathostomata
  -
Actinopterygii " indet. B "2 ray-finned fish
Scale morphotype 2
Osteichthyes
 Caudata -
Caudata indet.2 salamander
Six small, unassociated vertebrae
Reptilia
 Testudinata -
 Testudines - Pleurosternidae
Dinochelys sp.2 Gaffney 1979 turtle
Shell fragments
Glyptops sp.2 Marsh 1890 turtle
Shell fragments
 Dinosauria -
Dinosauria indet.2 dinosaur
Indeterminate eggshell
 Theropoda -
Theropoda indet. theropod
Eight isolated teeth and tooth fragments, including UW 18237
 Neornithischia -
Othnielosaurus sp.2 Galton 2007 ornithischian
 Neornithischia - Hypsilophodontidae
Hypsilophodontidae indet.2 Dollo 1882 hypsilophodontid
Teeth, including MWC 5851
 Loricata -
Crocodyliformes indet.2 Hay 1930 crocodilian
Teeth
 Loricata - Goniopholididae
Goniopholididae indet.2 Cope 1875 crocodilian
 Squamata -
Squamata indet.2 Oppel 1811 lizard
Small procoelous vertebral centrum
 Choristodera -
Cteniogenys sp.2 Gilmore 1928 choristodere
Mammalia
  -
Mammalia indet.1 Linnaeus 1758 mammal
Teeth, including UW 20218, UW 20577, MWC 5816, MWC 5855 and JRF 2000-2
 Docodonta - Docodontidae
Docodon sp.2 Marsh 1881 dodocont
UW 20578 (partial molar)
Docodon victor3 Marsh 1880 dodocont
UW 20578, partial right lower molar
 Allotheria -
Multituberculata indet.2 Cope 1884 multituberculate
UW 18027 (tooth); "probably Ctenacodon or Psalodon"
Osteichthyes
 Ceratodontiformes -
Potamoceratodus sp.2 Pardo et al. 2010 Australian lungfish