Walsh tracksite: Late Albian, Colorado
collected by J. M. Holbrook
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
|
||||||||||
| 6 specimens | ||||||||||
|
Reptilia
- Theropoda
|
||||||||||
| 1 specimen | ||||||||||
|
Reptilia
- Crocodylia
|
||||||||||
|
Crocodylia indet.
(Owen 1842)
|
1 specimen | |||||||||
| swimming trackway | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Colorado | County: | Baca |
| Coordinates: | 37.5° North, 102.3° West (view map) | ||||
| Paleocoordinates: | 43.5° North, 57.6° West (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Altitude: | 3850 feet | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Albian | 10 m.y. bin: | Cretaceous 4 |
| Key time interval: | Late Albian | ||
| Age range of interval: | 106.3 - 100.5 m.y. ago |
Stratigraphy
| Geological group: | Dakota | Formation: | Mesa Rica Sandstone | Member: | Lower |
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Sequence 3 - "the exposed section represents the Mesa Rica Sandstone and overlying Dry Creek Canyon Member." | |||||
Lithology and environment
| Primary lithology: | wave ripples,fine sandstone |
| Secondary lithology: | siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: "...a sequence of of thin wave-rippled, fine-grained sandstones with very thin siltstone partings..." | |
| Environment: | shallow subtidal indet. |
Taphonomy
| Modes of preservation: | mold/impression,trace |
| Degree of concentration: | -multiple events |
| Size of fossils: | macrofossils |
| Spatial orientation: | life position |
| Preservation of anatomical detail: | medium |
| Associated major elements: | some |
| Disassociated major elements: | some |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | surface (in situ),peel or thin section,field collection,observed (not collected) |
| Collection size: | 5 specimens |
| Reason for describing collection: | paleoecologic analysis |
| Collectors: | J. M. Holbrook |
Metadata
| Database number: | 77419 | ||
| Authorizer: | M. Carrano | Enterer: | S. Miller, M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2008-01-11 13:23:51 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2008-01-11 13:23:51 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 25992. | ETE | M. G. Lockley, J. Holbrook, R. Kukihara and M. Matsukawa. 2006. An ankylosaur-dominated dinosaur tracksite in the Cretaceous Dakota Group of Colorado: paleoenvironmental and sequence stratigraphic context. In S. G. Lucas and R. M. Sullivan (eds.), Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35:95-104 [M. Carrano/M. Carrano] |