5:00 Quarry and surroundings, Cholla Power Plant: Aegean - Bithynian, Arizona
collected by T. Olsen, S. Nesbitt

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Prolacertiformes indet. (Camp 1945)
"a 'prolacertiform'"
    = Archosauromorpha indet.
Schoch et al. 2010
Vertebrata indet. Lamarck 1801
Coprolites
Chondrichthyes - Hybodontiformes - Hybodontidae
Hybodontidae indet. (Agassiz 1834)
Nesbitt 2000
Fin spines
Amphibia - Temnospondyli
Temnospondyli indet. von Zittel 1887
3 specimens
Three partial skulls
Reptilia
Reptilia indet. Laurenti 1768
"a second large reptile" and "small reptile remains"
Poposauroidea informal new species
Nesbitt 2005
"Chatterjeea-like taxon", MSM P3260, ilium, sacral vertebrae
Arizonasaurus babbitti Welles 1947
see common names

Geography
Country:United States State/province:Arizona County:Navajo
Coordinates: 34.9° North, 110.3° West (view map)
Paleocoordinates:3.3° North, 38.9° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Triassic Epoch:Middle Triassic
Stage:Anisian 10 m.y. bin:Triassic 2
Key time interval:Aegean - Bithynian
Age range of interval:247.20000 - 242.00000 m.y. ago
Stratigraphy
Formation:Moenkopi Member:Holbrook
Stratigraphic resolution:group of beds
Stratigraphy comments: "upper Holbrook Member"; Lucas & Schoch (2002: Lethaia 35: 97-106) inferred the Holbrook member to be earliest Anisian (Aegean–Bithynian) in age based upon tetrapod biostratigraphy (Eocyclotosaurus used to correlate Holbrook Member to German Upper Bundsandstein) and magnetostratigraphy
Lithology and environment
Primary lithology:brown conglomeratic sandstone
Secondary lithology: sandstone
Includes fossils?Y
Lithology description: most bones collected from "a widespread channel conglomerate layer found beneath the massive sandstone. The one exception was found in the massive sandstone just above the conglomerate layer. The stratum where most of the bones were found represents a channel deposit of brownish sandstone that includes purple, green and brown clasts with small pebbles"
Environment:"channel"
Taphonomy
Modes of preservation:body
Degree of concentration:concentrated
Size of fossils:macrofossils
Spatial orientation:random
Preservation of anatomical detail:medium
Collection methods and comments
Collection methods:field collection
Reason for describing collection:general faunal/floral analysis
Collectors:T. Olsen, S. Nesbitt
Metadata
Also known as:MSM 99-84, 98-448, Five O'Clock Quarry
Database number:95092
Authorizer:R. Butler Enterer:R. Butler
Modifier:R. Butler Research group:vertebrate
Created:2010-04-06 07:30:17 Last modified:2012-10-25 03:38:24
Access level:the public Released:2010-04-06 07:30:17
Creative Commons license:CC BY
Reference information

Primary reference:

32378. S. J. Nesbitt. 2005. The Moenkopi Formation along the Little Colorado River in eastern Arizona. In S. J. Nesbitt, W. G. Parker, R. B. Irmis (eds.), Guidebook to the Triassic Formations of the Colorado Plateau in northern Arizona, Mesa Southwest Museum Bulletin 9:13-23 [R. Butler/R. Butler]

Secondary references:

32399 S. G. Lucas and R. R. Schoch. 2002. Triassic temnospondyl biostratigraphy, biochronology and correlation of the German Bundsandstein and North American Moenkopi Formation. Lethaia 35:97-106 [R. Butler/R. Butler]
32434 S. J. Nesbitt. 2000. A preliminary report on new vertebrate fossil sites, including a microsite from the Holbrook Member of the Moenkopi Formation, Holbrook, Arizona. Mesa Southwest Museum Bulletin 7:17-30 [R. Butler/R. Butler]
32392 S. J. Nesbitt. 2005. A new archosaur from the upper Moenkopi Formation (Middle Triassic) of Arizona and its implications for rauisuchian phylogeny and diversification. Neues Jahrbuch für Geologie und Paläontologie Monatshefte 2005(6):332-346 [R. Butler/R. Butler]
32095 R. R. Schoch, S. Nesbitt, J. Müller, S. G. Lucas, and J. A. Boy. 2010. The reptile assemblage from the Moenkopi Formation (Middle Triassic) of New Mexico. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 255:345-369 [R. Butler/R. Butler/R. Butler]