Dinosaur Wash, PFV 122, Dying Grounds (Triassic of the United States)

Also known as Dawn of the Dinosaurs, PEFO 85025, UCMP V7038, MNA 302/8, SMU 228, Camp Butte N1

Where: Apache County, Arizona (34.9° N, 109.8° W: paleocoordinates 10.6° N, 48.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Blue Mesa Member (Chinle Formation), Norian (228.0 - 208.5 Ma)

• "stratigraphically several meters lower than PFV 121"; Parker & Irmis (2005: fig. 8) show this high in the Blue Mesa Member. Upper Blue MEsa Mbr. is dated at 220.1 Ma.

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; paleosol/pedogenic, green, blue, calcareous mudstone and paleosol/pedogenic mudstone

• local paleochannel scours dissect mudstones with paleosols; floodplain-dominated fluvial system with suspension-load, high-sinuosity streams. Bones preserved in distal floodplain, with sediments deposited by crevasse splays and sheet flooding.
• lower part with gleyed paleosols, poorly drained, reduced. upper part with "bluish calcic horizon toward the top of the sequence, in which the bones are thought to be preserved", and carbonate nodules.

Size classes: macrofossils, mesofossils

Collected in 1998; reposited in the NMMNH

Collection methods: surface (float), surface (in situ), mechanical,

Primary reference: P. A. Murry and R. A. Long. 1989. Geology and paleontology of the Chinle Formation, Petrified Forest National Park and vicinity, Arizona and a discussion of vertebrate fossils of the southwestern Upper Triassic. In S. G. Lucas and A. P. Hunt (eds.), Dawn of the Age of Dinosaurs in the American Southwest, New Mexico Museum of Natural History, Albuquerque 29-64 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 48547: authorized by Matthew Carrano, entered by Matthew Carrano on 22.03.2005, edited by Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Vertebrata indet.1 Lamarck 1801
PEFO 20341, 20361-62, 20391
Gnathostomata
  -
? Chondrichthyes indet.1 Huxley 1880 cartilaginous fish
PEFO 20357-59
Chondrichthyes
 Xenacanthiformes - Xenacanthidae
"? Xenacanthus moorei" = Triodus moorei3, ""Xenacanthus" moorei" = Triodus moorei1
"? Xenacanthus moorei" = Triodus moorei3 Woodward 1889 elasmobranch
PEFO 3896
""Xenacanthus" moorei" = Triodus moorei1 Woodward 1889 elasmobranch
PEFO 3822-23, 3897
 Hybodontiformes -
Hybodontoidea indet.1 Zangerl 1981 elasmobranch
PEFO 20348
 Hybodontiformes - Lonchidiidae
"Lissodus humblei" = Lonchidion humblei3, ? Lissodus sp.3
"Lissodus humblei" = Lonchidion humblei3 Murry 1981 elasmobranch
PEFO 3826-27
? Lissodus sp.3 Brough 1935 elasmobranch
PEFO 3829, 3898-99
Gnathostomata
  -
Osteichthyes indet.1 bony fish
PEFO 20344, 20356, 20360, 20379, 20390
Actinopterygii indet.4 ray-finned fish
PEFO 20346-47
Actinopteri
 Perleidiformes - Colobodontidae
Colobodontidae indet.3 Stensiƶ 1916
PEFO 3841-42, 3902-03
 Palaeonisciformes - Palaeoniscidae
cf. Turseodus sp. Leidy 1857
PEFO 3846, 3906, 20342-43
 Palaeonisciformes - Redfieldiidae
Redfieldiidae indet.3 Hutchinson 1973
PEFO 3834, 20344, 20354, 20363
? Redfieldiidae indet.3 Hutchinson 1973
PEFO 3835, 3846, 3901
Osteichthyes
 Dipnoi - Arganodontidae
? Arganodus sp.1 Martin 1979 lungfish
 Temnospondyli - Metoposauridae
Metoposauridae indet.7 Watson 1919 tetrapod
PEFO 20351-53, 20381-83
Apachesaurus gregorii2 Hunt 1993 tetrapod
UCMP centra
"Buettneria perfecta" = Koskinonodon perfectus1 Case 1922 tetrapod
Reptilia
  -
? Reptilia indet.1 Laurenti 1768 reptile
PEFO 20364-67, 20371-72, 20375-76
 Eosuchia -
Trilophosaurus buettneri3 Case 1928 archosauromorph
PEFO 3893-95, teeth
Archosauriformes indet.1 Gauthier 1986 archosauromorph
PEFO 20369
Archosauriformes "morphotype D"1 Gauthier 1986 archosauromorph
PEFO 20368
Archosauriformes "morphotype J"1 Gauthier 1986 archosauromorph
PEFO 20373
Archosauriformes "morphotype K"1 Gauthier 1986 archosauromorph
PEFO 20370
Archosauriformes "morphotype L"1 Gauthier 1986 archosauromorph
PEFO 20366
 Eosuchia - Doswelliidae
Vancleavea campi6 Long and Murry 1995 archosauromorph
PEFO 4855, centrum
 Archosauria -
Archosauria indet.1 Cope 1869 archosaur
PEFO 20377-78
 Theropoda -
 Ornithischia -
? Ornithischia indet.7 ornithischian
PEFO 20338-39
 Dinosauromorpha - Silesauridae
Silesauridae indet.5 Langer et al. 2010 ornithodiran
PEFO 34347
 Pseudosuchia -
 Loricata -
 Pseudosuchia -
Rauisuchia indet.1 Huene 1942 archosaur
 Phytosauria - Parasuchidae
"Phytosauridae indet." = Mystriosuchinae7, Leptosuchus sp.2
"Phytosauridae indet." = Mystriosuchinae7 von Huene 1915 archosaur
PEFO 20340, 20384-89, 20393
Leptosuchus sp.2 Case 1922 archosaur
"group A"
 Eosuchia -
? Crosbysaurus sp.1 Heckert 2004 archosauromorph
PEFO 20337
Crosbysaurus harrisae1 Heckert 2004 archosauromorph
PEFO 20336