Twentymile Wash dinosaur tracksite: Early/Lower Callovian - Middle Callovian, Utah
collected 1998

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Theropoda
? Therangospodus sp. Lockley et al. 2000
Hamblin and Foster 2001
Reptilia - Theropoda - Eubrontidae
? Megalosauripus sp. Lessertisseur 1955
Reptilia
cf. Brontopodus sp. Farlow et al. 1989
1 individual
    = Brontopodus sp. Farlow et al. 1989
Milàn and Loope 2007
see common names

Geography
Country:United States State/province:Utah County:Kane
Coordinates: 37.7° North, 111.5° West (view map)
Paleocoordinates:31.8° North, 55.1° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Middle Jurassic
Stage:Callovian 10 m.y. bin:Jurassic 5
Key time interval:Early/Lower Callovian - Middle Callovian
Age range of interval:165.30000 - 161.50000 m.y. ago
Stratigraphy
Geological group:San Rafael Formation:Entrada Sandstone
Stratigraphic resolution:group of beds
Stratigraphy comments: upper 16 m of "upper sandy member" formation; at least 3 track-bearing levels
Lithology and environment
Primary lithology:gray,white sandstone
Secondary lithology:"cross stratification" sandstone
Includes fossils?Y
Lithology description: "upper part of a sloping sandstone bench"; "1-3 m, grey to white, horizontally-bedded sandstone units that directly overlay massive cross-bedded sandstones."
Environment:dune
Geology comments: "aeolian dune fields on the margins of a large intracontinental seaway"
Taphonomy
Modes of preservation:cast,mold/impression,trace
Degree of concentration:-multiple events
Size of fossils:macrofossils
Spatial orientation:life position
Preservation of anatomical detail:good
Abundance in sediment:common
Associated major elements:many
Disassociated major elements:some
Temporal resolution:time-averaged
Spatial resolution:autochthonous
Collection methods and comments
Collection methods:surface (in situ),observed (not collected)
Reason for describing collection:general faunal/floral analysis
Collection dates:1998
Metadata
Also known as:Collett Wash, TWDT, 20-Mile Wash, GS-ENM
Database number:55325
Authorizer:M. Carrano Enterer:M. Carrano, K. Maguire
Modifier:M. Carrano Research group:vertebrate
Created:2005-10-10 07:52:36 Last modified:2022-09-22 12:27:20
Access level:the public Released:2005-10-10 07:52:36
Creative Commons license:CC BY
Reference information

Primary reference:
28125.ETE J. R. Foster, A. H. Hamblin, and M. G. Lockley. 2000. The oldest evidence of a sauropod dinosaur in the western United States and other important vertebrate trackways from Grand Staircase-Escalante National Monument, Utah. Ichnos 7(3):169-181 [M. Carrano/M. Carrano]

Secondary references:

77732 B. H. Breithaupt, N. A. Matthews, and T. A. Noble. 2004. An integrated approach to three-dimensional data collection at dinosaur tracksites in the Rocky Mountain West. Ichnos 11:11-26 [M. Carrano/M. Carrano]
25708ETE O. Graverson, J. Milàn, and D. B. Loope. 2007. Dinosaur tectonics: a structural analysis of theropod undertracks with a reconstruction of theropod walking dynamics. Journal of Geology 115:641-654 [M. Carrano/M. Carrano]
15414ETE A. H. Hamblin and J. R. Foster. 2001. Ancient animal footprints and traces in the Grand Staircase-Escalante National Monument, south-central Utah. D. A. Sprinkel, T. C. Chidsey, Jr., & P. B. Anderson (eds.), Geology of Utah's Parks and Monuments: 2000 Utah Geological Association Publication 28:1-12 [M. Carrano/K. Maguire/M. Carrano]
81617 M. G. Lockley and G. D. Gierlinksi. 2014. Jurassic tetrapod footprint ichnofaunas and ichnofacies of the Western Interior, USA. Volumina Jurassica 12(2):133-150 [M. Carrano/M. Carrano]
69162 D. B. Loope and J. Milàn. 2016. Dinosaur tracks in eolian strata: new insights into track formation, walking kinetics, and trackmaker behavior. In P. L. Falkingham, D. Marty, & A. Richter (eds.), Dinosaur Tracks: The Next Steps 358-364 [M. Carrano/M. Carrano]
14810ETE N. Matthews, B. Breithaupt, T. Noble, A. Titus, and J. Smith. 2005. A geospatial look at the morphological variation of tracks at the Twentymile Wash dinosaur tracksite, Grand Staircase-Escalante National Monument, Utah. Journal of Vertebrate Paleontology 25(3, suppl.):90A [M. Carrano/M. Carrano]
82674 N. Matthews, T. Noble, A. Titus, J. Foster, and B. Breithaupt. 2002. Digital mapping of dinosaur tracks in the Grand Staircase-Escalante National Monument, Utah. Journal of Vertebrate Paleontology 22(3 (suppl.)):85A [M. Carrano/M. Carrano]
77730 N. A. Matthews, B. H. Breithaupt, and E. H. Southwell. 2006. Travels, trace fossils, and technology. Tate 2006: Track-ways and Trace Fossils. 12th Annual Symposium in Paleontology & Geology 61-70 [M. Carrano/M. Carrano]
17893ETE N. A. Matthews and B. H. Breithaupt. 2006. Terrestrial tracks trace theropods through time and terrain. 9th International Symposium on Mesozoic Terrestrial Ecosystems and Biota, Abstracts and Proceedings Volume 80-83 [M. Carrano/M. Carrano/M. Carrano]
78556 J. Milàn and D. B. Loope. 2006. Dinosaurfodspor fra Entrada Sandstenen, Utah [Dinosaur footprints from the Entrada Sandstone, Utah]. Varv 2006(2):20-27 [M. Carrano/M. Carrano]
24403ETE J. Milàn and D. B. Loope. 2007. Preservation and erosion of theropod tracks in eolian deposits: examples from the Middle Jurassic Entrada Sandstone, Utah, U.S.A. Journal of Geology 115(4):375-386 [M. Carrano/M. Carrano]