Downs Quarry, MNA 207-10 (Triassic of the United States)

Where: Apache County, Arizona (34.4° N, 109.5° W: paleocoordinates 10.1° N, 48.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Petrified Forest Member (Chinle Formation), Norian (228.0 - 208.5 Ma)

• 3 m above upper level in the Placerias Quarry; also placed in the Petrified Forest Mb of the Chinle Fm. Also referred to the Bluewater Creek Formation

• bed-level stratigraphic resolution

Environment/lithology: pond; concretionary carbonate

• "low-energy depositional environments", like the Placerias Quarry (i.e. pond or marsh)
• Many bones "are encased in gray carbonate concretions which have an odor of hydrogen sulfide when broken."

Size classes: macrofossils, mesofossils, microfossils

Preservation: concretion, coprolite

Collected by L. Jacobs, P. Murray

Collection methods: bulk, sieve,

Primary reference: L. L. Jacobs and P. A. Murry. 1980. The vertebrate community of the Triassic Chinle Formation near St. Johns, Arizona. Aspects of Vertebrate History: Essays in Honor of Edwin Harris Colbert, L. L. Jacobs (ed.), Museum of Northern Arizona Press 55-71 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 39219: authorized by Matthew Carrano, entered by Matthew Carrano on 24.05.2004, edited by Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Branchiopoda
  -
? Branchiopoda indet. Latreille 1817 branchiopod
Gnathostomata
  -
Chondrichthyes "A"3 Huxley 1880 cartilaginous fish
Chondrichthyes
 Xenacanthiformes - Xenacanthidae
"Xenacanthus moorei" = Triodus moorei
"Xenacanthus moorei" = Triodus moorei Woodward 1889 elasmobranch
Gnathostomata
  -
Actinopteri
 Perleidiformes - Colobodontidae
? Colobodontidae indet. Stensiƶ 1916
 Palaeonisciformes - Palaeoniscidae
cf. Turseodus sp.3 Leidy 1857
 Palaeonisciformes - Redfieldiidae
Redfieldiidae indet.3 Hutchinson 1973
Lasalichthyes sp. or Synorichthyes sp. (ref 10591)
 Pholidopleuriformes - Pholidopleuridae
cf. Australosomus sp.3 Pivetau 1930
 Semionotiformes - Semionotidae
Semionotidae indet. Woodward 1890
Osteichthyes
 Dipnoi - Ceratodontidae
Ceratodus sp. Agassiz 1838 lungfish
Coelacanthimorpha
 Coelacanthiformes - Coelacanthidae
Coelacanthidae indet.3 Agassiz 1843 coelacanth
Osteichthyes
 Temnospondyli - Metoposauridae
"Buettneria perfecta" = Koskinonodon perfectus2, "Buettneria perfecta" = Koskinonodon perfectus2
"Buettneria perfecta" = Koskinonodon perfectus2 Case 1922 tetrapod
"Buettneria perfecta" = Koskinonodon perfectus2 Case 1922 tetrapod
Reptilia
  -
Reptilia indet.3 Laurenti 1768 reptile
 Ornithischia - Fabrosauridae
Fabrosauridae indet. Galton 1972 ornithischian
  -
Parrishia mccreai2 Long and Murry 1995 archosaur
MNA Pl. 2708, 3081, 3125, cervical centra. MNA Pl. 3071, 3073, 3079, dorsal centra. MNA Pl. 2445, posterior dorsal. MNA Pl. 2746, sacral
 Stagonolepididae - Stagonolepididae
Acaenasuchus geoffreyi2 Long and Murry 1995 archosaur
MNA V3714, Pl. 3066, 3050, 3067, 3113, plates
"Stagonolepis wellesi" = Calyptosuchus wellesi2 Long and Ballew 1985 archosaur
MNA Pl. 2665, 2729, 3090, 3092, 3094, 3091, 2676, 2666, 2667, 2668, 3117, 3129, 2744, 3100, 3101, V3744, postcranial specimens
Tecovasuchus chatterjeei1 Martz and Small 2006 archosaur
MNA 3202, osteoderms
 Aetosauria -
"Desmatosuchus haplocerus" = Episcoposaurus haplocerus2
"Desmatosuchus haplocerus" = Episcoposaurus haplocerus2 Cope 1892 archosaur
 Loricata -
Hesperosuchus agilis Colbert 1952 crocodilian
MNA Pl. 3102, radius
 Loricata - Rauisuchidae
Postosuchus kirkpatricki2 Chatterjee 1985 rauisuchid
MNA V3740, distal right humerus
 Pseudosuchia -
Poposaurus gracilis Mehl 1915 archosaur
MNA Pl. 3077, sacrum. MNA V3715, dorsal centrum. MNA Pl. 2694, proximal femur
 Phytosauria - Parasuchidae
Leptosuchus sp.2, "Leptosuchus adamanensis" = Smilosuchus adamanensis2, "Paleorhinus sp." = Parasuchus2
Leptosuchus sp.2 Case 1922 archosaur
MNA V3732, Pl. 2731, 3072, V3736, V3733, V3726, Pl. 3062, Pl. 3069, Pl. 2738, Pl. 2741, V3734, Pl. 3055, Pl. 3056, V3665, Pl. 2736, Pl. 3088, Pl. 2680, V3601, Pl. 3054, Pl. 3057, Pl. 3070, V3727, Pl. 3059, V3667, Pl. 3087, 3097, 2730, 3086, 3063, 3064, 3058, 2740, 3060, 3103, 3085, 3093, 3080, 2742
"Leptosuchus adamanensis" = Smilosuchus adamanensis2 Camp 1930 archosaur
"Paleorhinus sp." = Parasuchus2 Lydekker 1885 archosaur
 Eosuchia - Tanystropheidae
Tanytrachelos sp. Olsen 1979 archosauromorph
Osteichthyes
 Therapsida - Cynodontia
unclassified
  -
Plantae indet. Haeckel 1866