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

•

•Kent et al. Petrified Forest Member of the Chinle formation falls between magneto zones PF4n and PF2n (roughly 209.95–213.44Ma)

• 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

Show authors, comments, and common names
unclassified
  -
Cionichthyes sp.3, Plantae indet.
Plantae indet. Haeckel 1866
Gnathostomata
  -
Osteichthyes "indet. C"3, Osteichthyes "indet. D"3, Osteichthyes "indet. G"3, Osteichthyes "indet. L"3, Osteichthyes "indet. N"3, ? Osteichthyes "indet. R"3, ? Osteichthyes "indet. Z"3
? Osteichthyes "indet. R"3 bony fish
"fish?"
? Osteichthyes "indet. Z"3 bony fish
"fish?"
Osteichthyes
 Palaeonisciformes - Redfieldiidae
Redfieldiidae indet.3
Redfieldiidae indet.3 Hutchinson 1973
Lasalichthyes sp. or Synorichthyes sp. (ref 10591)
 Palaeonisciformes - Palaeoniscidae
Palaeoniscidae indet.3, cf. Turseodus sp.3
cf. Turseodus sp.3 Leidy 1857
Actinopteri
 Perleidiformes - Colobodontidae
? Colobodontidae indet.
? Colobodontidae indet. Stensiö 1916
 Semionotiformes - Semionotidae
Semionotidae indet.
Semionotidae indet. Woodward 1890
Osteichthyes
 Dipnoi - Ceratodontidae
Ceratodus sp.
Ceratodus sp. Agassiz 1838 lungfish
Coelacanthimorpha
 Coelacanthiformes - Coelacanthidae
Coelacanthidae indet.3
Coelacanthidae indet.3 Agassiz 1843 coelacanth
Amphibia
 Temnospondyli - Metoposauridae
"Buettneria perfecta" = Anaschisma browni2, "Buettneria perfecta" = Anaschisma browni2
"Buettneria perfecta" = Anaschisma browni2 Branson 1905 tetrapod
"Buettneria perfecta" = Anaschisma browni2 Branson 1905 tetrapod
Osteichthyes
 Therapsida - Cynodontia
Cynodontia indet.3
Reptilia
  -
Reptilia indet.3, Parrishia mccreai2
Reptilia indet.3 Laurenti 1768 reptile
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
 Ornithischia - Fabrosauridae
Fabrosauridae indet.
Fabrosauridae indet. Galton 1972 ornithischian
 Pseudosuchia - Stagonolepididae
Tecovasuchus chatterjeei1, "Stagonolepis wellesi" = Calyptosuchus wellesi2, Acaenasuchus geoffreyi2
Tecovasuchus chatterjeei1 Martz and Small 2006 aetosaur
MNA 3202, osteoderms
"Stagonolepis wellesi" = Calyptosuchus wellesi2 Long and Ballew 1985 aetosaur
MNA Pl. 2665, 2729, 3090, 3092, 3094, 3091, 2676, 2666, 2667, 2668, 3117, 3129, 2744, 3100, 3101, V3744, postcranial specimens
Acaenasuchus geoffreyi2 Long and Murry 1995 aetosaur
MNA V3714, Pl. 3066, 3050, 3067, 3113, plates
 Pseudosuchia -
"Desmatosuchus haplocerus" = Episcoposaurus haplocerus2
"Desmatosuchus haplocerus" = Episcoposaurus haplocerus2 Cope 1892 aetosaur
 Loricata -
Hesperosuchus agilis
Hesperosuchus agilis Colbert 1952 crocodilian
MNA Pl. 3102, radius
 Loricata - Rauisuchidae
Postosuchus kirkpatricki2
Postosuchus kirkpatricki2 Chatterjee 1985 rauisuchid
MNA V3740, distal right humerus
 Pseudosuchia -
Poposaurus gracilis
Poposaurus gracilis Mehl 1915 archosaur
MNA Pl. 3077, sacrum. MNA V3715, dorsal centrum. MNA Pl. 2694, proximal femur
 Phytosauria - Parasuchidae
"Paleorhinus sp." = Parasuchus2, "Leptosuchus adamanensis" = Smilosuchus adamanensis2, Leptosuchus sp.2
"Paleorhinus sp." = Parasuchus2 Lydekker 1885 archosaur
"Leptosuchus adamanensis" = Smilosuchus adamanensis2 Camp 1930 archosaur
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
 Diapsida - Tanystropheidae
Tanytrachelos sp.
Tanytrachelos sp. Olsen 1979 archosauromorph
Osteichthyes
 Pholidopleuriformes - Pholidopleuridae
cf. Australosomus sp.3
cf. Australosomus sp.3 Pivetau 1930 ray-finned fish
Gnathostomata
  -
Chondrichthyes "A"3
Chondrichthyes "A"3 Huxley 1880 cartilaginous fish
Chondrichthyes
 Xenacanthiformes - Xenacanthidae
"Xenacanthus moorei" = Triodus moorei
"Xenacanthus moorei" = Triodus moorei Woodward 1889 elasmobranch
Deuteropoda
  -
? Branchiopoda indet.
? Branchiopoda indet. Latreille 1817 branchiopod
1Heckert et al. 2007; 2Long and Murry 1995; 3Tannenbaum 1983