Downs Quarry, MNA 207-10: Norian, Arizona
collected by L. Jacobs, P. Murray

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Cionichthyes sp.
Tannenbaum 1983
? Branchiopoda indet. Latreille 1817
Chondrichthyes informal A
Tannenbaum 1983 1 element
Chondrichthyes - Xenacanthiformes - Xenacanthidae
Xenacanthus moorei (Woodward 1889)
11 elements
recombined as Triodus moorei
Osteichthyes informal indet. C Huxley 1880
Tannenbaum 1983 1 element
Osteichthyes informal indet. D Huxley 1880
Tannenbaum 1983 2 elements
Osteichthyes informal indet. G Huxley 1880
Tannenbaum 1983 1 element
Osteichthyes informal indet. L Huxley 1880
Tannenbaum 1983 1 element
Osteichthyes informal indet. N Huxley 1880
Tannenbaum 1983 1 element
? Osteichthyes informal indet. R Huxley 1880
Tannenbaum 1983 1 element
? Osteichthyes informal indet. Z Huxley 1880
Tannenbaum 1983 1 element
Actinopteri - Perleidiformes - Colobodontidae
? Colobodontidae indet. Stensiö 1916
Actinopteri - Palaeonisciformes - Palaeoniscidae
Palaeoniscidae indet. Vogt 1852
Tannenbaum 1983
cf. Turseodus sp. Leidy 1857
Tannenbaum 1983
Actinopteri - Palaeonisciformes - Redfieldiidae
Redfieldiidae indet. Hutchinson 1973
Tannenbaum 1983
Lasalichthyes sp. or Synorichthyes sp. (ref 10591)
Actinopteri - Pholidopleuriformes - Pholidopleuridae
cf. Australosomus sp. Pivetau 1930
Tannenbaum 1983 2 elements
Actinopteri - Semionotiformes - Semionotidae
Semionotidae indet. Woodward 1890
Ceratodus sp. Agassiz 1838
Coelacanthimorpha - Coelacanthiformes - Coelacanthidae
Coelacanthidae indet. Agassiz 1843
Tannenbaum 1983 1 element
Metoposaurus sp. Lydekker 1890
    = Buettneria perfecta Case 1922
Long and Murry 1995
recombined as Koskinonodon perfectus
MNA Pl. 2683, 2697, dermal bone fragments. MNA Pl. 2864, plate. MNA V3675, vertebral centrum
Placerias gigas Camp and Welles 1956
    = Buettneria perfecta Case 1922
Long and Murry 1995
recombined as Koskinonodon perfectus
MNA Pl. 2732, vertebrae
Reptilia indet. Laurenti 1768
Tannenbaum 1983 6 specimens
Reptilia - Fabrosauridae
Fabrosauridae indet. Galton 1972
Parrishia mccreai Long and Murry 1995
Long and Murry 1995 8 elements
nomen dubium belonging to Archosauria
MNA Pl. 2708, 3081, 3125, cervical centra. MNA Pl. 3071, 3073, 3079, dorsal centra. MNA Pl. 2445, posterior dorsal. MNA Pl. 2746, sacral
Acaenasuchus geoffreyi Long and Murry 1995
Long and Murry 1995 5 specimens
MNA V3714, Pl. 3066, 3050, 3067, 3113, plates
Stagonolepis wellesi (Long and Ballew 1985)
Long and Murry 1995 16 specimens
original and current combination Calyptosuchus wellesi
MNA Pl. 2665, 2729, 3090, 3092, 3094, 3091, 2676, 2666, 2667, 2668, 3117, 3129, 2744, 3100, 3101, V3744, postcranial specimens
Tecovasuchus chatterjeei Martz and Small 2006
Heckert et al. 2007 1 specimen
MNA 3202, osteoderms
Desmatosuchus sp. Case 1920
4 specimens
    = Desmatosuchus haplocerus Cope 1892
Long and Murry 1995
nomen dubium belonging to Aetosauria
?MNA PL. 2710, 3096, 3110, 3127, cervical vertebra and plates
Hesperosuchus agilis Colbert 1952
1 element
MNA Pl. 3102, radius
Postosuchus kirkpatricki Chatterjee 1985
Long and Murry 1995 1 element
MNA V3740, distal right humerus
Poposaurus gracilis Mehl 1915
3 specimens
MNA Pl. 3077, sacrum. MNA V3715, dorsal centrum. MNA Pl. 2694, proximal femur
Reptilia - Parasuchidae
Leptosuchus sp. Case 1922
Long and Murry 1995 38 specimens
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
Rauisuchidae indet. Huene 1942
1 individual
    = Leptosuchus adamanensis Camp 1930
Long and Murry 1995
recombined as Smilosuchus adamanensis
MNA Pl. 2675, braincase. MNA V3698, left squamosal. MNA V3739, quadrate, paroccipital process. MNA V3737, snout
Phytosaurus sp. Jaeger 1828
    = Paleorhinus sp. Williston 1904
Long and Murry 1995
synonym of Parasuchus
MNA V3728, portion of snout
Reptilia - Tanystropheidae
Tanytrachelos sp. Olsen 1979
1 specimen
Cynodontia indet. Owen 1861
Tannenbaum 1983 1 specimen
Plantae indet. Haeckel 1866
see common names

Country:United States State/province:Arizona County:Apache
Coordinates: 34.4° North, 109.5° West (view map)
Paleocoordinates:10.1° North, 48.1° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Period:Triassic Epoch:Late/Upper Triassic
Stage:Norian 10 m.y. bin:Triassic 4
Key time interval:Norian
Age range of interval:228.00000 - 208.50000 m.y. ago
Formation:Chinle Member:Petrified Forest
Stratigraphic resolution:bed
Stratigraphy comments: 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
Lithology and environment
Primary lithology:concretionary "carbonate"
Includes fossils?Y
Lithology description: Many bones "are encased in gray carbonate concretions which have an odor of hydrogen sulfide when broken."
Geology comments: "low-energy depositional environments", like the Placerias Quarry (i.e. pond or marsh)
Modes of preservation:body,concretion,coprolite
Degree of concentration:concentrated
Size of fossils:macrofossils,mesofossils,microfossils
Preservation of anatomical detail:excellent
Articulated whole bodies:none
Associated major elements:none
Disassociated major elements:many
Disassociated minor elements:many
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:some microfossils
Collection methods:bulk,sieve,field collection
Rock censused:5800 kg
Reason for describing collection:general faunal/floral analysis
Collectors:L. Jacobs, P. Murray
Database number:39219
Authorizer:M. Carrano, R. Butler Enterer:M. Carrano, R. Butler
Modifier:M. Carrano Research group:vertebrate
Created:2004-05-24 11:12:03 Last modified:2018-04-23 17:06:15
Access level:the public Released:2004-05-24 11:12:03
Creative Commons license:CC BY
Reference information

Primary reference:

10591. 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]

Secondary references:

19347ETE A. R. Fiorillo, K. Padian, and C. Musikasinthorn. 2000. Taphonomy and depositional setting of the Placerias Quarry (Chinle Formation: Late Triassic, Arizona). Palaios 15:373-386 [M. Carrano/M. Carrano]
31129 A. B. Heckert and S. G. Lucas. 2002. Acaenasuchus geoffreyi (Archosauria: Aetosauria) from the Upper Triassic Chinle Group: juvenile of Desmatosuchus haplocerus. In A. B. Heckert, S. G. Lucas (eds.), Upper Triassic Stratigraphy and Paleontology. New Mexico Museum of Natural History and Science Bulletin 21:205-214 [R. Butler/R. Butler]
24941ETE A. B. Heckert and S. G. Lucas. 2006. Micro- and small vertebrate biostratigraphy and biochronology of the Upper Triassic Chinle Group, southwestern USA. In J. D. Harris, S. G. Lucas, J. A. Spielmann, M. G. Lockley, A. R. C. Milner, J. I. Kirkland (eds.), The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science Bulletin 37:94-104 [M. Carrano/M. Carrano/P. Wagner]
43558 A. B. Heckert, J. A. Spielmann, S. G. and A. P. Hunt. 2007. Biostratigraphic utility of the Upper Triassic aetosaur Tecovasuchus (Archosauria: Stagonolepididae), an index taxon of St. Johnsian (Adamanian: late Carnian) time. New Mexico Museum of Natural History and Science Bulletin 41:51-57 [R. Butler/R. Butler]
63048 L. L. Jacobs. 1980. Additions to the Triassic vertebrate fauna of Petrified Forest National Park, Arizona. Journal of the Arizona-Nevada Academy of Science 15(1):12 [M. Carrano/M. Carrano]
30645ETE L. L. Jacobs. 1985. Small vertebrate fossils from the Chinle Formation (Triassic) near St. Johns, Arizona. National Geographic Society Research Reports (1979) 20:417-419 [M. Carrano/M. Carrano]
14122ETE R. A. Long and P. A. Murry. 1995. Late Triassic (Carnian and Norian) tetrapods from the southwestern United States. New Mexico Museum of Natural History and Science Bulletin 4:1-254 [M. Carrano/M. Carrano/M. Carrano]
25567ETE S. G. Lucas, A. B. Heckert, and A. P. Hunt. 1997. Stratigraphy and biochronological significance of the Late Triassic Placerias quarry, eastern Arizona (U.S.A.). Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 203(1):23-46 [M. Carrano/M. Carrano]
12930ETE 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]
11081ETE F. A. Tannenbaum. 1983. The microvertebrate fauna of the Placerias and Downs Quarries, Chinle Formation (Upper Triassic) near St. Johns, Arizona. University of California, Berkeley 1-117 [M. Carrano/M. Carrano/M. Carrano]