List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Phytosauria
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Phytosauria indet.
(Jaeger 1828)
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| UMNH VP 24643, partial skeleton | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Utah | County: | San Juan |
| Coordinates: | 38.1° North, 109.2° West (view map) | ||||
| Paleocoordinates: | 14.4° North, 47.5° West | ||||
| Basis of coordinate: | stated in text |
Stratigraphy
| Formation: | Chinle | ||||
| Local section: | Eagle's Nest Ridge | Local bed: | Kane Spring Beds | ||
| Stratigraphy comments: Middle beds, ~4-5 meters above the lower sandstone. | |||||
Lithology and environment
| Primary lithology: | sandstone |
| Secondary lithology: | claystone |
| Includes fossils? | Y |
| Lithology description: The middle beds between the lower and upper ledge-forming sandstones are siltstone to fine-grained sandstone at Eagle’s Nest and Redd Ridge but contain abundant claystone and siltstone at Schaeffer’s Ridge and Skull Ridge, the only part of the Chinle Formation section in Lisbon Valley where such fine-grained sediments occur in abundance. However, ledge-forming sandstones and conglomerates up to a few meters thick are almost always interbedded with the fine-grained middle beds. In Spiller Canyon on the northern side of Skull Ridge (figure 9H), and locally at Eagle’s Nest (figure 9G), the middle beds contain interbedded mudstones and ledge-forming sandstones with fissile horizontal laminated beds. The middle beds of the Kane Springs beds also contain blocks of tilted strata that may represent foreset bedding or slump blocks. The middle beds probably represent poorly-drained lacustrine and deltaic environments traversed by streams and are very similar to the fluvial, lacustrine and deltaic deposits of the Monitor Butte Member (Blakey and Gubitosa, 1983; Dubiel, 1987; Dubiel and Hasiotis, 2011). The Monitor Butte Member also contains black mudstones with interbedded coal that have been interpreted as paludal deposits forming in lake and marsh environments (Dubiel and Hasiotis, 2011), but these are absent in the Kane Springs beds. We have not observed any clearly developed paleosols in the Kane Springs beds. | |
| Environment: | lacustrine deltaic indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Also known as: | UGS 42Sa434V; Eagle's Nest Ridge | ||
| Database number: | 218215 | ||
| Authorizer: | B. Gee | Enterer: | B. Gee |
| Modifier: | B. Gee | Research group: | vertebrate |
| Created: | 2021-02-21 13:43:53 | Last modified: | 2021-02-21 13:44:52 |
| Access level: | the public | Released: | 2021-02-21 13:43:53 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 75693. | J. W. Martz, R. B. Irmis, and A. R. C. Milner. 2014. Lithostratigraphy and biostratigraphy of the Chinle Formation (upper Triassic) in southern Lisbon Valley, southeastern Utah. In J. S. MacLean, R. F. Biek, J. E. Huntoon (eds.), Utah Geological Association Publication 43:397-448 [B. Gee/B. Gee] |