PBDB Collection

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

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Chondrichthyes

	Chondrichthyes informal A	Tannenbaum 1983	1 element
Chondrichthyes - Xenacanthiformes - Xenacanthidae

	Xenacanthus moorei (Woodward 1889)		11 elements
Osteichthyes

	Osteichthyes informal indet. C	Tannenbaum 1983	1 element

	Osteichthyes informal indet. D	Tannenbaum 1983	2 elements

	Osteichthyes informal indet. G	Tannenbaum 1983	1 element

	Osteichthyes informal indet. L	Tannenbaum 1983	1 element

	Osteichthyes informal indet. N	Tannenbaum 1983	1 element

	? Osteichthyes informal indet. R	Tannenbaum 1983	1 element
	"fish?"

	? Osteichthyes informal indet. Z	Tannenbaum 1983	1 element
	"fish?"
Pholidopleuriformes - Pholidopleuridae

	cf. Australosomus sp. Pivetau 1930	Tannenbaum 1983	2 elements
Amphibia - Temnospondyli - Metoposauridae

	Metoposaurus sp. Lydekker 1890
	= Buettneria perfecta Case 1922	Long and Murry 1995
	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
	MNA Pl. 2732, vertebrae
Reptilia

	Reptilia indet. Laurenti 1768	Tannenbaum 1983	6 specimens
Reptilia - Tanystropheidae

	Tanytrachelos sp. Olsen 1979		1 specimen
Reptilia

	Parrishia mccreai Long and Murry 1995	Long and Murry 1995	8 elements
	MNA Pl. 2708, 3081, 3125, cervical centra. MNA Pl. 3071, 3073, 3079, dorsal centra. MNA Pl. 2445, posterior dorsal. MNA Pl. 2746, sacral
Reptilia - Fabrosauridae

	Fabrosauridae indet. Galton 1972
Reptilia

	Desmatosuchus sp. Case 1920		4 specimens
	= Desmatosuchus haplocerus Cope 1892	Long and Murry 1995
	?MNA PL. 2710, 3096, 3110, 3127, cervical vertebra and plates

	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
	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

	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

	Phytosaurus sp. Jaeger 1828
	= Paleorhinus sp. Williston 1904	Long and Murry 1995
	MNA V3728, portion of snout

	Rauisuchidae indet. Huene 1942		1 individual
	= Leptosuchus adamanensis Camp 1930	Long and Murry 1995
	MNA Pl. 2675, braincase. MNA V3698, left squamosal. MNA V3739, quadrate, paroccipital process. MNA V3737, snout

	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
Cynodontia

	Cynodontia indet. Owen 1861	Tannenbaum 1983	1 specimen
Coelacanthimorpha - Coelacanthiformes - Coelacanthidae

	Coelacanthidae indet. Agassiz 1843	Tannenbaum 1983	1 element
Dipnoi - Ceratodontidae

	Ceratodus sp. Agassiz 1838
Actinopteri - Semionotiformes - Semionotidae

	Semionotidae indet. Woodward 1890
Actinopteri - Perleidiformes - Colobodontidae

	? Colobodontidae indet. Stensiö 1916
Palaeonisciformes - Redfieldiidae

	Redfieldiidae indet. Hutchinson 1973	Tannenbaum 1983
	Lasalichthyes sp. or Synorichthyes sp. (ref 10591)
Palaeonisciformes - Palaeoniscidae

	Palaeoniscidae indet. Vogt 1852	Tannenbaum 1983

	cf. Turseodus sp. Leidy 1857	Tannenbaum 1983
unclassified

	Cionichthyes sp.	Tannenbaum 1983
Branchiopoda

	? Branchiopoda indet. Latreille 1817
unclassified

	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:	9.9° North, 37.4° West (Wright 2013)
Basis of coordinate:	stated in text
Geographic resolution:	outcrop

Period:	Triassic	Epoch:	Late Triassic
Stage:	Norian	10 m.y. bin:	Triassic 4
Key time interval:	Norian
Age range of interval:	227 - 208.5 m.y. ago
Age estimate:	213.44 ± 5.16 to 209.95 ± 0.44 Ma (paleomagnetic)

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

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."
Environment:	pond
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
Fragmentation:	frequent
Spatial resolution:	parautochthonous

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:	G. Varnham	Research group:	vertebrate
Created:	2004-05-24 11:12:03	Last modified:	2025-02-22 15:12:02
Access level:	the public	Released:	2004-05-24 11:12:03
Creative Commons license:	CC0

19347	ETE	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]
24941	ETE	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]
30645	ETE	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]
79159		D. V. Kent, P. E. Olsen, C. Lepre, C. Rasmussen, R. Mundil, G. E. Gehrels, D. Giesler, R. B. Irmis, J. W. Geissman and W. G. Parker. 2019. Magnetochronology of the Entire Chinle Formation (Norian Age) in a Scientific Drill Core From Petrified Forest National Park (Arizona, USA) and Implications for Regional and Global Correlations in the Late Triassic. Geochemistry, Geophysics, Geosystems [P. Mannion/G. Varnham]
14122	ETE	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/P. Wagner]
25567	ETE	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]
12930	ETE	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]
11081	ETE	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]