ammonites
Black Ridge Dinosaur tracksite (Jurassic of the United States)

Also known as Colorado National Monument

Where: Mesa County, Colorado (39.1° N, 108.8° W: paleocoordinates 34.8° N, 55.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Salt Wash Member (Morrison Formation), Late/Upper Jurassic (161.2 - 145.5 Ma)

• Tracks occur within the middle shaly unit of the Salt Wash Member.

• group of beds-level stratigraphic resolution

Environment/lithology: "channel"; sandstone and mudstone

• "The tracks appear to be associated with a sedimentary facies in which recurring sequences of channel and overbank fluvial sediments characterized by 0.5 - 1-meter-thick sandstones overlying mudstone intervals up to 2 meters thick."

Size class: macrofossils

Preservation: cast, trace

Collection methods: surface (float),

• This particular site is one of three within the middle shaly unit of the Salt Wash Member. The largest infilled track structure is greater than 1 meter across and greater than 1 meter deep.

Primary reference: G. F. Engelmann and S. T. Hasiotis. 1999. Deep dinosaur tracks in the Morrison Formation; sole marks that are really sole marks . Utah Geological Survey Miscellaneous Publication 99-1:179-183 [J. Alroy/R. Whatley/R. Whatley] more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 13277: authorized by John Alroy, entered by Robin Whatley on 12.02.2002, edited by Margaret Shalap

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)

Black Ridge Dinosaur tracksite: Late/Upper Jurassic, Colorado

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Dinosauria
Theropoda indet. (Marsh 1881)
Santucci et al. 2006
Sauropoda indet. (Marsh 1878)
Santucci et al. 2006
see common names

Geography
Country:United States State/province:Colorado County:Mesa
Coordinates: 39.1° North, 108.8° West (view map)
Paleocoordinates:34.8° North, 55.0° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Late/Upper Jurassic
Key time interval:Late/Upper Jurassic
Age range of interval:161.2 - 145.5 m.y. ago
Stratigraphy
Formation:Morrison Member:Salt Wash
Stratigraphic resolution:group of beds
Stratigraphy comments: Tracks occur within the middle shaly unit of the Salt Wash Member.
Lithology and environment
Primary lithology: sandstone
Secondary lithology: mudstone
Includes fossils?Y
Lithology description: "The tracks appear to be associated with a sedimentary facies in which recurring sequences of channel and overbank fluvial sediments characterized by 0.5 - 1-meter-thick sandstones overlying mudstone intervals up to 2 meters thick."
Environment:"channel"
Taphonomy
Modes of preservation:cast,trace
Size of fossils:macrofossils
Spatial orientation:life position
Preservation of anatomical detail:variable
Temporal resolution:snapshot
Collection methods and comments
Collection methods:surface (float),observed (not collected)
Reason for describing collection:taphonomic analysis
Collection method comments: This particular site is one of three within the middle shaly unit of the Salt Wash Member. The largest infilled track structure is greater than 1 meter across and greater than 1 meter deep.
Metadata
Also known as:Colorado National Monument
Database number:13277
Authorizer:J. Alroy, M. Uhen Enterer:R. Whatley, M. Shalap
Modifier:M. Carrano Research group:vertebrate
Created:2002-02-12 18:59:55 Last modified:2012-01-25 09:48:13
Access level:the public Released:2002-02-12 18:59:55
Creative Commons license:CC BY-NC-ND
Reference information
Primary reference:
44035% 1060G. F. Engelmann and S. T. Hasiotis. 1999. Deep dinosaur tracks in the Morrison Formation; sole marks that are really sole marks . Utah Geological Survey Miscellaneous Publication 99-1:179-183 [J. Alroy/R. Whatley/R. Whatley]

Secondary references:

35162 V. L. Santucci, A. P. Hunt, T. Nyborg and J. P. Kenworthy. 2006. Additional fossil vertebrate tracks in National Park Service Areas. New Mexico Museum of Natural History and Science Bulletin 34:152-158 [M. Uhen/M. Shalap/M. Uhen]