Krzyzanowski Bonebed, NMMNH L-3764 (Triassic of the United States)

Also known as Blue Hills

Where: Arizona (34.5° N, 109.4° W: paleocoordinates 10.1° N, 48.0° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Kent et al. 2019: Blue Mesa member lies between magneto zones PF5r to PF8n (approximately 221.75–216.97Ma)

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; concretionary, pebbly, sideritic, brown, gray, white conglomerate and red, blue mudstone

• "a thin (6-8-cm thick), well-rounded, very light gray to bluish white clay pebble conglomerate overlain by 75-80 cm of highly smectitic, purple mudstone that is heavily color mottled to various shades of gray and white. Thin sheets of dark brownish gray to greenish gray sideritic concretions cover many of the bones."

Size classes: macrofossils, mesofossils

Reposited in the NMMNH

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

Primary reference: A. B. Heckert. 2004. Late Triassic microvertebrates from the lower Chinle Group (Otischalkian-Adamanian: Carnian), southwestern U.S.A. New Mexico Museum of Natural History and Science Bulletin 27:1-170 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 22705: authorized by Anna Behrensmeyer, entered by Anna Behrensmeyer on 29.05.2001, edited by Matthew Carrano, Emma Dunne and Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Osteichthyes
 Ceratodontiformes - Arganodontidae
Arganodus sp. Martin 1979 Australian lungfish
Reptilia
  -
Reptilia indet. Laurenti 1768 reptile
NMMNH P-34561-34650
 Diapsida -
Archosauromorpha indet. archosauromorph
Archosauriformes "indet. L" Gauthier 1986 archosauromorph
NMMNH P-34096
? Archosauriformes "indet. H" Gauthier 1986 archosauromorph
NMMNH P-34091-92
Archosauriformes indet.1 Gauthier 1986 archosauromorph
 Phytosauria - Parasuchidae
"Phytosauridae indet." = Mystriosuchinae, aff. Rutiodon sp.
"Phytosauridae indet." = Mystriosuchinae von Huene 1915 archosaur
NMMNH P-34081-85, 34097
aff. Rutiodon sp. Emmons 1856 archosaur
NMMNH P-34098
 Pseudosuchia -
Poposaurus gracilis Mehl 1915 archosaur
 Loricata -
 Pseudosuchia -
 Pseudosuchia - Stagonolepididae
Desmatosuchus sp. Case 1920 aetosaur
Stagonolepis sp. Agassiz 1844 aetosaur
 Dinosauria -
Dinosauria indet. dinosaur
NMMNH P-34627; pubis
 Ornithischia -
? Ornithischia indet. ornithischian
NMMNH P-34095, 34090
 Theropoda -
Theropoda indet. theropod
NMMNH P-34620-39, 34640
Amphibia
 Temnospondyli - Metoposauridae
"Buettneria sp." = Anaschisma, Apachesaurus sp.
"Buettneria sp." = Anaschisma Branson 1905 tetrapod
NMMNH P-34086-87; also listed as Metoposauridae indet.
Apachesaurus sp. Hunt 1993 tetrapod
Gnathostomata
  -
Actinopterygii indet. ray-finned fish
NMMNH P-34088
 Malerisaurinae -
Puercosuchus traverorum2 Marsh et al. 2022
NMMNH L-3764