Don's Ridge South: Valanginian, Utah
collected by Don DeBlieux 2005
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Iguanodontidae
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| tibia | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Utah | County: | Grand |
| Coordinates: | 38.9° North, 110.1° West (view map) | ||||
| Paleocoordinates: | 36.9° North, 44.5° West (Wright 2013) | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Valanginian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Valanginian | ||
| Age range of interval: | 137.05 - 132.6 m.y. ago |
Stratigraphy
| Geological group: | Dakota | Formation: | Cedar Mountain | Member: | Yellow Cat |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "upper level" at this site (J. Kirkland, pers. comm. to MTC); below caprock marker bed, middle of lower part of member
The age of the base of the YCM is unknown and estimates range from Berrisian to early Aptian. Britt et al. 2007 suggested a maximum depositional age for the YCM of ~124Ma, but Sames et al. 2010 suggested on the basis of ostracod biostratigraphy the YCM may be as old as Late Berrisian. Hendrix et al. 2015 and Joeckel et al. 2019 supported this with U-Pb dates from detrital zircons, the latter study suggested that the upper YCM is Valanginian. At any rate, the age of the overlying Poison strip member was dated at its base to 119.4Ma, so the YCM is older than this. | |||||
Lithology and environment
| Primary lithology: | mudstone |
| Secondary lithology: | chert |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | surface (in situ),mechanical,field collection | ||
| Reason for describing collection: | general faunal/floral analysis | ||
| Collectors: | Don DeBlieux | Collection dates: | 2005 |
Metadata
| Database number: | 97958 | ||
| Authorizer: | M. Carrano | Enterer: | M. Oreska |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2010-09-09 13:37:35 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2010-09-09 13:37:35 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 32617. | ETE | J. I. Kirkland and S. K. Madsen. 2007. The Lower Cretaceous Cedar Mountain Formation, Eastern Utah: the view up an always interesting learning curve. Utah Geological Association Publication 35 1-108 [M. Carrano/M. Carrano/M. Carrano] |
Secondary references:
| 78389 | J. I. Kirkland, M. B. Suarez, C. A. Suarez and R. K. Hunt-Foster. 2016. The Medial Cretaceous in East-Central Utah—the Cedar Mountain Formation and its Bounding Strata. Society of Vertebrate Paleontology Field Trip Guide. 1-117 [M. Carrano/M. Carrano/M. Uhen] |