Tomahawk locality, USNM 39981: Carnian, Virginia
collected by Olsen, Sues 1983, 1988-1992
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Pteridophyta indet.
Haeckel 1875
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Sues et al. 1994 | |||||||||
Palaeonisciformes
- Redfieldiidae
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Dictyopyge macrurus
(Redfield 1841)
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Amphibia
- Temnospondyli
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? Urodela indet.
(Duméril 1805)
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= ? Lissamphibia indet.
Haeckel 1866
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Gardner and DeMar 2013 | |||||||||
Reptilia
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Xenodiphyodon petraios n. gen., n. sp.
Sues and Olsen 1993
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Sues and Olsen 1993 | 1 specimen | ||||||||
USNM 448631, partial dentary | ||||||||||
Reptilia
- Procolophonidae
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Procolophonidae indet.
Lydekker 1889
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1 specimen | |||||||||
USNM 448630, partial maxilla | ||||||||||
= Gomphiosauridion baileyae n. gen., n. sp.
Sues and Olsen 1993
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Sues and Olsen 1993 | |||||||||
Reptilia
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Archosauria indet.
Cope 1869
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Sues and Olsen 1990 | 10 specimens | ||||||||
USNM 448587, associated osteoderms (holotype). USNM 448580-448586, 448588, 448589 | ||||||||||
= Doswellia kaltenbachia
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Olsen 1989 | |||||||||
= Euscolosuchus olseni n. gen., n. sp.
Sues 1992
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Sues 1992 | |||||||||
Uatchitodon kroehleri n. gen., n. sp.
Sues 1991
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Sues et al. 1994 | 12 specimens | ||||||||
USNM 448611 (holotype). USNM 448603-448, 610, 448621-448622, 448624, teeth | ||||||||||
Reptilia
- Phytosauria
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Phytosauria indet.
(Jaeger 1828)
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Isolated teeth | ||||||||||
Reptilia
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Vinitasaura lizae n. gen., n. sp.
Sues and Kligman 2021
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Sues and Kligman 2021 | |||||||||
USNM PAL 770100 (holotype), partial left dentary; USNM PAL 770100 (partial left dentary) | ||||||||||
Reptilia
- Lepidosauria
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? Lacertilia indet.
(Owen 1842)
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= Lepidosauria indet.
Haeckel 1866
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Sues et al. 1994 | |||||||||
Reptilia
- Sphenodonta
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Sphenodonta indet.
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1 specimen | |||||||||
synonym of Sphenodontia | ||||||||||
"similar to Diphydontosaurus" | ||||||||||
unclassified
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? Chiniquodontidae indet.
Huene 1936
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6 specimens | |||||||||
"new genus near Microconodon" | ||||||||||
= Microconodon tenuirostris
Osborn 1886
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Sues and Olsen 1990 | |||||||||
USNM 437637, ROM 44300, 44301, partial dentaries, USNM 448579, 448600, ROM 44302, isolated teeth | ||||||||||
aff. Massetognathus sp.
Romer 1967
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41 specimens | |||||||||
USNM 437632, left maxilla (holotype). CM 20050, 76800, 76801, 78803, USNM 437634, 437635, 437636, 448562, 448570, 448593, 448599, 448632, 448633, VMNH 3575, 3578, cranial remains. CM 76805, 76807, 76808, 76812, 76815, 76818, USNM 448563-448569, 448571-448573, 448575, 448576, 448578, 448597, 448601, 448625, 448629, isolated teeth. USNM 448602, 448598, VMNH 3577, postcranial elements | ||||||||||
= Boreogomphodon jeffersoni n. gen., n. sp.
Sues and Olsen 1990
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Sues and Olsen 1990 | |||||||||
Chondrichthyes
- Hybodontiformes
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Lissodus sp.
Brough 1935
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Sues et al. 1994 | |||||||||
Gastropoda
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Gastropoda indet.
Cuvier 1795
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Sues et al. 1994 | |||||||||
Branchiopoda
- Cyzicidae
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Cyzicus sp.
Audouin 1837
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Ostracoda
- Podocopida
- Darwinulidae
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Darwinula sp.
Brady and Robertson 1885
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see common names |
Geography
Country: | United States | State/province: | Virginia | County: | Chesterfield |
Coordinates: | 37.5° North, 77.7° West (view map) | ||||
Paleocoordinates: | 2.4° North, 16.1° West | ||||
Basis of coordinate: | stated in text | ||||
Altitude: | 91 meters | ||||
Geographic resolution: | outcrop |
Time
Period: | Triassic | Epoch: | Late/Upper Triassic |
Stage: | Carnian | 10 m.y. bin: | Triassic 3 |
Key time interval: | Carnian | ||
Age range of interval: | 237.00000 - 227.00000 m.y. ago |
Stratigraphy
Geological group: | Chesterfield | Formation: | Vinita | Member: | Tomahawk Creek |
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: "Based on conchostracans, Kozur & Weems (2007) recently dated much of the succession in the Richmond Basin and correlative units in the adjacent Taylorsville basin as early Carnian (Cordevolian), but earlier Huber et al. (1993) had argued for a late Carnian age of these strata. At the present time this controversy cannot be resolved" (Sues & Hopson 2010)
"Turkey Branch Formation" was previously used for this locality; Richmond Basin, Newark Supergroup |
Lithology and environment
Primary lithology: | silty,calcareous mudstone |
Includes fossils? | Y |
Lithology description: "massive calcareous mudstone, together with small (1-10 mm) carbonate nodules, poorly preserved root traces...At least two irregular layers of fissile, more silty mudstone extend within the massive mudstone" | |
Environment: | lacustrine - small |
Geology comments: "shallow-wayer lacustrine origin" |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | concentrated |
Size of fossils: | macrofossils,mesofossils,microfossils |
Spatial orientation: | random |
Preservation of anatomical detail: | excellent |
Articulated whole bodies: | none |
Associated major elements: | none |
Disassociated major elements: | many |
Disassociated minor elements: | many |
Fragmentation: | occasional |
Collection methods and comments
Collection methods: | bulk,surface (float),surface (in situ),chemical,mechanical,sieve,field collection | ||
Reason for describing collection: | general faunal/floral analysis | ||
Museum repositories: | USNM | ||
Collectors: | Olsen, Sues | Collection dates: | 1983, 1988-1992 |
Metadata
Also known as: | 1988-1 | ||
Database number: | 39159 | ||
Authorizer: | M. Carrano, P. Holroyd, B. Gee | Enterer: | M. Carrano, B. Gee, P. Holroyd |
Modifier: | M. Carrano | Research group: | vertebrate |
Created: | 2004-05-21 16:00:08 | Last modified: | 2022-11-04 10:49:28 |
Access level: | the public | Released: | 2004-05-21 16:00:08 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
83018. | P. E. Olsen. 1989. Stop 3.2: Tomahawk tetrapod quarry. In P. E. Olsen, R. W. Schlische, & P. J. W. Gore (eds.), Tectonic, Depositional, and Paleoecological History of Early Mesozoic Rift Basins, Eastern North America. Gulf, North Carolina, USA to Parrsboro, Nova Scotia, Canada. July 20–30, 1989. International Geological Congress Field Trip T-351 54-55 [M. Carrano/M. Carrano/M. Carrano] |
Secondary references:
65027 | J. D. Gardner and D. G. DeMar. 2013. Mesozoic and Palaeocene lissamphibian assemblages of North America: a comprehensive review. Palaeobiodiversity and Palaeoenvironments 93:459-515 [P. Holroyd/P. Holroyd/M. Carrano] | |
34225 | J. S. Mitchell, A. B. Heckert, and H.-D. Sues. 2010. Grooves to tubes: evolution of the venom delivery system in a Late Triassic reptile. Naturwissenschaften 97:1117-1121 [R. Butler/R. Butler/R. Butler] | |
7923 | H.-D. Sues and P. E. Olsen. 1993. A new procolophonid and a new tetrapod of uncertain, possibly procolophonian affinities from the Upper Triassic of Virginia. Journal of Vertebrate Paleontology 13(3):282-286 [M. Uhen/M. Uhen/M. Uhen] | |
10658 | ETE | H.-D. Sues. 1991. Venom-conducting teeth in a Triassic reptile. Nature 351:141-143 [M. Carrano/M. Carrano/M. Carrano] |
34179 | H.-D. Sues. 1992. A remarkable new armored archosaur from the Upper Triassic of Virginia. Journal of Vertebrate Paleontology 12:142-149 [R. Butler/R. Butler] | |
34178 | H.-D. Sues. 2001. On Microconodon, a Late Triassic cynodont from the Newark Supergroup of eastern North America. Bulletin of the Museum of Comparative Zoology 156:37-48 [R. Butler/R. Butler] | |
34177 | H.-D. Sues and J. A. Hopson. 2010. Anatomy and phylogenetic relationships of Boreogomphodon jeffersoni (Cynodontia: Gomphodontia) from the Upper Triassic of Virginia. Journal of Vertebrate Paleontology 30(4):1202-1220 [R. Butler/R. Butler] | |
75847 | H.-D. Sues and B. T. Kligman. 2021. A new lizard-like reptile from the Upper Triassic (Carnian) of Virginia and the Triassic record of Lepidosauromorpha (Diapsida, Sauria). Journal of Vertebrate Paleontology [B. Gee/B. Gee] | |
10574 | ETE | H.-D. Sues and P. E. Olsen. 1990. Triassic vertebrates of Gondwanan aspect from the Richmond Basin of Virginia. Science 249:1020-1023 [M. Carrano/M. Carrano/M. Carrano] |
10573 | ETE | H.-D. Sues, P. E. Olsen, and P. A. Kroehler. 1994. Small tetrapods from the Upper Triassic of the Richmond basin (Newark Supergroup), Virginia. In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods, N. C. Fraser and H.-D. Sues (eds.), Cambridge University Press 161-170 [M. Carrano/M. Carrano/M. Carrano] |