Barrel Springs Arroyo 4 (USNM): Late/Upper Maastrichtian, New Mexico
collected by Reeside 1916
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Theropoda
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Megalosauridae indet.
(Fitzinger 1843)
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| vertebrae | ||||||||||
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= Theropoda indet.
Marsh 1881
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Carrano 2025 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | New Mexico | County: | San Juan |
| Coordinates: | 36.3° North, 108.0° West (view map) | ||||
| Paleocoordinates: | 43.6° North, 85.7° West | ||||
| Basis of coordinate: | stated in text | ||||
| Altitude: | 1920 meters | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
| Key time interval: | Late/Upper Maastrichtian | ||
| Age range of interval: | 72.10000 - 66.00000 m.y. ago |
Stratigraphy
| Formation: | Ojo Alamo | Member: | Naashoibito | ||
| Local section: | Barrl | Local bed: | 2 | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 3-8 ft above base of Ojo Alamo Sandstone | |||||
Lithology and environment
| Primary lithology: | concretionary,brown,white conglomeratic sandstone |
| Includes fossils? | Y |
| Lithology description: "Sandstone, soft white, conglomeratic; contains brown concretions" | |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | dispersed |
| Size of fossils: | macrofossils,mesofossils |
| Disassociated minor elements: | all |
| Fragmentation: | occasional |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | biostratigraphic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | Reeside | Collection dates: | 1916 |
Metadata
| Database number: | 62545 | ||
| Authorizer: | M. Carrano | Enterer: | M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2006-07-21 11:26:13 | Last modified: | 2018-07-13 16:05:50 |
| Access level: | the public | Released: | 2006-07-21 11:26:13 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 18055. | ETE | C. W. Gilmore. 1919. Reptilian faunas of the Torrejon, Puerco, and underlying Upper Cretaceous formations of San Juan County, New Mexico. United States Geological Survey Professional Paper 119:1-68 [M. Carrano/M. Carrano] |
Secondary references:
| 14199 | ETE | M. T. Carrano. 2025. Taxonomic opinions on the Dinosauria. [M. Carrano/M. Carrano/M. Carrano] |