Long Walk Tracksite: Early Cenomanian, Utah
collected 1989
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Geography
| Country: | United States | State/province: | Utah | County: | Emery |
| Coordinates: | 39.2° North, 111.0° West (view map) | ||||
| Paleocoordinates: | 46.3° North, 69.1° West (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| *Period: | Late/Upper Cretaceous | ||
| *International age/stage: | Albian | ||
| Key time interval: | Early Cenomanian | ||
| Age range of interval: | 100.5 - 93.9 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Dakota | Formation: | Cedar Mountain | Member: | Mussentuchit |
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: site is 10 m below contact with "Dakota" Formation
A radiometric age of 98.37 ± 0.07 Ma was obtained by the OMNH from volcanic ash within the Mussentuchit Member (Cifelli and others, 1997, 1999). Additional ages by Garrison and others (2007) ranging from 96.7 ± 0.5 to 98.2 ±0.6 Ma indicate that the Mussentuchit Member was deposited over an interval of 1.5 Ma during the early Cenomanian and supports a correlation with the siliceous marine Mowry Shale to the north, which is well-constrained from 40Ar/39Ar sanidine ages obtained from bentonite beds that bracket the Mowry in Wyoming; the basal Arrow Creek Bentonite is 98.5 ± 0.5 Ma and the capping Clay Spur Bentonite is 97.2 ± 0.7 Ma (Obradovich, 1993; Ogg and Hinnov, 2012; Sprinkel and others, 2012) near the base of the Upper Cretaceous. Tucker et al. 2020 also suggested a likely depositional age of ~96-94Ma for the Musseuntuchit member. | |||||
Lithology and environment
| Primary lithology: | carbonaceous mudstone |
| Secondary lithology: | lenticular,current ripples,"cross stratification",medium,coarse sandstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: carbonaceous mudstone in association with numerous thin, lenticular sandstone bodies. Sandstone is a medium to coarse-grained subarenite with fluvial ripple cross-lamination and large-scale trough cross-bedding. | |
| Environment: | fluvial indet. |
Taphonomy
| Modes of preservation: | cast,trace |
| Size of fossils: | macrofossils |
| Spatial orientation: | life position |
| Associated major elements: | some |
| Disassociated major elements: | some |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | surface (float),surface (in situ),observed (not collected) |
| Reason for describing collection: | taxonomic analysis | Collection dates: | 1989 |
Metadata
| Database number: | 27048 | ||
| Authorizer: | M. Carrano | Enterer: | M. Carrano |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2002-11-14 14:28:59 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2002-11-14 14:28:59 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 63747. | F. L. DeCourten. 1991. The Long Walk Quarry and Tracksite: unveiling the mysterious Early Cretaceous of the Dinosaur Triangle region. In W. R. Averett (ed.), Guidebook for Dinosaur Quarries and Tracksites Tour, Western Colorado and Eastern Utah 19-25 [M. Carrano/M. Carrano] |
Secondary references:
| 2087 | J. I. Kirkland, B. Britt, D. L. Burge, K. Carpenter, R. Cifelli, F. DeCourten, J. Eaton, S. Hasiotis, and T. Lawton. 1997. Lower to Middle Cretaceous dinosaur faunas of the central Colorado Plateau: a key to understanding 35 million years of tectonics, sedimentology, evolution and biogeography. Brigham Young University Geology Studies 42(2):69-103 [M. Carrano/J. Alroy/M. Carrano] | |
| 61886 | M. G. Lockley and A. P. Hunt. 1995. Dinosaur Tracks and Other Fossil Footprints of the Western United States xxi-338 [M. Carrano/M. Carrano] | |
| 13287 | ETE | M. G. Lockley, J. I. Kirkland, F. L. DeCourten, B. B. Britt, and S. T. Hasiotis. 1999. Dinosaur tracks from the Cedar Mountain Formation of eastern Utah: a preliminary report. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publication 99-1:253-257 [A. Behrensmeyer/M. Carrano/M. Carrano] |