NMMNH L-2739, Sixmile Spring: Norian, New Mexico
collected by A. B. Heckert & S. G. Lucas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Xenacanthiformes - Xenacanthidae
"Xenacanthus" sp. Beyrich 1848
Heckert 2004 1 specimen
NMMNH P-34443, broken labial cusp
Chondrichthyes - Hybodontiformes
Hybodontoidea indet. Agassiz 1834
Heckert 2004
Osteichthyes
Osteichthyes indet. Huxley 1880
Heckert 2004 1 specimen
NMMNH P-34431, vertebra
Coelacanthimorpha - Coelacanthiformes - Coelacanthidae
Coelacanthidae indet. Agassiz 1843
Heckert 2004 2 specimens
NMMNH P-34424, 34425, scales
Amphibia - Temnospondyli - Metoposauridae
Metoposauridae indet. Watson 1919
Heckert 2004 1 specimen
NMMNH P-34442, tooth
Buettneria sp. Case 1922
synonym of Anaschisma
Apachesaurus sp. Hunt 1993
Heckert 2004 1 specimen
NMMNH P-34441, centrum
Reptilia
Reptilia indet. Laurenti 1768
Heckert 2004 8 specimens
NMMNH P-34433-34436, 34438, 34439, centra. NMMNH P-34460, 34461, teeth
Trilophosaurus aff. jacobsi Murry 1987
Heckert 2004 3 specimens
NMMNH P-34447, 34448, 34472, teeth
    = Trilophosaurus jacobsi Murry 1987
Heckert et al. 2006
Theropoda indet. Marsh 1881
Heckert 1997 1 specimen
"more advanced than the Herrerasauridae"; NMMNH P-18401, ten vertebral fragments
    = Archosauriformes indet. Gauthier 1986
Nesbitt et al. 2007
Archosauriformes informal indet. B Gauthier 1986
Heckert 2004 1 specimen
NMMNH P-34451, tooth, "morphotype B"
Archosauriformes informal indet. F Gauthier 1986
Heckert 2004 1 specimen
NMMNH P-34452, tooth, "morphotype F"
Archosauriformes informal indet. M Gauthier 1986
Heckert 2004 1 specimen
NMMNH P-34453, tooth, "morphotype M"
Archosauriformes informal indet. S Gauthier 1986
Heckert 2004 1 specimen
NMMNH P-34473, tooth, "morphotype S"
? Theropoda indet. Marsh 1881
Heckert 1997 1 specimen
NMMNH P-18400, partial skeleton
    = Archosauriformes indet. Gauthier 1986
Nesbitt et al. 2007
Reptilia - Stagonolepididae
Stagonolepididae indet. Lydekker 1887
Reptilia
Parasuchia indet. (Huxley)
Heckert 1997 10 specimens
synonym of Phytosauria
NMMNH P-18270, occipital condyle. NMMNH P-18271-18275, vertebral fragments. NMMNH P-34454-34457, teeth
? Parasuchia indet. Huxley
Heckert 1997 1 specimen
synonym of Phytosauria
NMMNH P-18275, four centrum fragments
Reptilia - Ornithischia
? Ornithischia indet. Seeley 1888
Heckert 2004 3 specimens
NMMNH P-34458, 34459; NMMNH P-34500 (only first two are "?"), teeth
Reptilia
? Prosauropoda indet. Huene 1920
Heckert 2004 1 specimen
NMMNH P-18405, tooth fragment
aff. Tecovasaurus sp. Hunt and Lucas 1994
Heckert 1997 1 specimen
NMMNH P-18402, tooth
    = Crosbysaurus harrisae Heckert 2004
Heckert 2004
Ornithischia indet. Seeley 1888
Heckert 1997 2 specimens
NMMNH P-18403, 18404, teeth
    = Crosbysaurus harrisae Heckert 2004
Heckert 2004
Actinopterygii
Actinopterygii indet. Cope 1887
Heckert 2004 2 specimens
NMMNH P-34444, 34445, teeth
Palaeonisciformes - Redfieldiidae
Redfieldiidae indet. Hutchinson 1973
Heckert 2004
Palaeonisciformes - Palaeoniscidae
aff. Turseodus sp. Leidy 1857
Heckert 2004
see common names

Geography
Country:United States State/province:New Mexico County:McKinley
Coordinates: 35.4° North, 108.5° West (view map)
Paleocoordinates:10.9° North, 47.1° West
Basis of coordinate:based on nearby landmark
Altitude:2234 meters
Geographic resolution:small collection
Time
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
Stratigraphy
Geological group:Chinle Formation:Bluewater Creek
Stratigraphic resolution:bed
Stratigraphy comments: Adamanian LVF; radiometric dates suggest that the Chinle is entirely Norian in age. Also known as the Bluewater Creek Member of the Chinle Formation. Near base of formation.
Lithology and environment
Primary lithology:paleosol/pedogenic,sideritic,gray,red,blue mudstone
Includes fossils?Y
Lithology description: "a grayish-blue to grayish red-purple, highly smectitic mudstone...almost no evidence for coarse-grained clastic material...abundant siderite (calcrete) nodules and some color mottling"
Environment:pond
Geology comments: either "a pond or other limnitic environment" with "post-depositional pedogenesis" or "a distal floodplain environment."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:some
Fragmentation:frequent
Collection methods and comments
Collection methods:bulk,selective quarrying,surface (in situ),mechanical,sieve,field collection
Reason for describing collection:general faunal/floral analysis
Museum repositories:NMMNH
Collectors:A. B. Heckert & S. G. Lucas
Metadata
Also known as:Fort Wingate
Database number:55248
Authorizer:M. Carrano, R. Butler Enterer:M. Carrano, R. Butler
Modifier:M. Carrano Research group:vertebrate
Created:2005-10-03 10:31:14 Last modified:2018-04-23 17:06:28
Access level:the public Released:2005-10-03 10:31:14
Creative Commons license:CC BY
Reference information

Primary reference:

14718.ETE A. B. Heckert, S. G. Lucas, and A. P. Hunt. 1994. A late Carnian theropod from New Mexico: implications for the early evolution of Theropoda. Journal of Vertebrate Paleontology 14(3, suppl.):28A [M. Carrano/M. Carrano]

Secondary references:

25561ETE A. B. Heckert. 1997. The tetrapod fauna of the Upper Triassic lower Chinle Group (Adamanian: latest Carnian) of the Zuni Mountains, west-central New Mexico. In S. G. Lucas, J. W. Estep, T. E. Williamson, & G. S. Morgan (eds.), New Mexico's Fossil Record 1. New Mexico Museum of Natural History and Science Bulletin 11:29-39 [M. Carrano/M. Carrano]
17273ETE A. B. Heckert. 2004. Late Triassic microvertebrates from the lower Chinle Group (Otischalkian-Adamanian: Carnian), southwestern U.S.A. New Mexico Museum of Natural History and Science Bulletin 27:1-170 [M. Carrano/M. Carrano]
25555ETE A. B. Heckert and S. G. Lucas. 1998. First use of ornithischian dinosaurs for biostratigraphic zonation of the Upper Triassic. Albertiana 20:58-63 [M. Carrano/M. Carrano]
32141 A. B. Heckert, S. G. Lucas, L. F. Rinehart, J. A. Spielmann, A. P. Hunt and R. Kahle. 2006. Revision of the archosauromorph reptile Trilophosaurus, with a description of the first skull of Trilophosaurus jacobsi, from the Upper Triassic Chinle Group, West Texas, USA. Palaeontology 49(3):621-640 [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]
24249ETE S. J. Nesbitt, R. B. Irmis, and W. G. Parker. 2007. A critical re-evaluation of the Late Triassic dinosaur taxa of North America. Journal of Systematic Palaeontology 5(2):209-243 [M. Carrano/M. Carrano]