Barrel Springs Arroyo (USNM): Late/Upper Maastrichtian, New Mexico
collected by Bauer 1915
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Ceratopsidae
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Ceratopsidae indet.
Marsh 1888
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teeth | ||||||||||
Reptilia
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? Deinodon sp.
Leidy 1856
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1 specimen | |||||||||
nomen dubium belonging to Tyrannosauroidea | ||||||||||
teeth | ||||||||||
Reptilia
- Crocodilia
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Crocodilia indet.
Owen 1842
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spelled with current rank as Crocodylia | ||||||||||
teeth, scute | ||||||||||
Actinopteri
- Lepisosteiformes
- Lepisosteidae
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Lepisosteus sp.
Agassiz 1843
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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: | estimated from map | ||||
Altitude: | 1910 meters | ||||
Geographic resolution: | small collection |
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: | 70.60000 - 66.00000 m.y. ago |
Stratigraphy
Formation: | Ojo Alamo | Member: | Naashoibito | ||
Local section: | Barrl | Local bed: | 2 | ||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: 11 ft above base of conglomerate of Sinclair & Granger
Flynn et al. 2020: The mammalian faunas of the Naashoibito Member correlates to the Lancian Land Mammal Age, which suggests a late Maastrichtian age (Williamson and Weil, 2008a). Paleobotanical analyses on the megaflora and pollen indicates that the Ojo Alamo Sandstone is earliest Paleocene in age and is correlated with palynostratigraphic zones P1 or P2 ( Anderson, 1959; Nichols, 2003; Williamson et al., 2008; Flynn and Peppe, in press). Recent detrital sanidine and paleomagnetic work has constrained the Naashoibito Member to the latest Maastrichtian indicating the K/Pg boundary is represented by the unconformity between the Naashoibito Member and the Ojo Alamo Sandstone (Peppe et al., 2013; Flynn et al., 2019). These data, coupled with previous sedimentological analyses, demonstrate that the Naashoibito Member is late Maastrichtian in age and the Ojo Alamo Sandstone is early Paleocene in age with an erosive unconformity, that cuts out the Cretaceous-Paleogene boundary, separating the two units |
Lithology and environment
Primary lithology: | not reported |
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | dispersed |
Size of fossils: | mesofossils |
Disassociated major elements: | all |
Fragmentation: | frequent |
Collection methods and comments
Collection methods: | field collection | ||
Reason for describing collection: | general faunal/floral analysis | ||
Museum repositories: | USNM | ||
Collectors: | Bauer | Collection dates: | 1915 |
Metadata
Also known as: | Gilmore locality 67 | ||
Database number: | 62529 | ||
Authorizer: | M. Carrano | Enterer: | M. Carrano |
Modifier: | G. Varnham | Research group: | vertebrate |
Created: | 2006-07-21 06:58:01 | Last modified: | 2022-02-08 07:28:43 |
Access level: | the public | Released: | 2006-07-21 06:58:01 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
18036. | ETE | C. W. Gilmore. 1916. Contributions to the geology and paleontology of San Juan County, New Mexico. 2. Vertebrate faunas of the Ojo Alamo, Kirtland and Fruitland Formations. United States Geological Survey Professional Paper 98-Q:279-302 [M. Carrano/M. Carrano] |
Secondary references:
12314 | ETE | R. S. Lull. 1933. A revision of the Ceratopsia or horned dinosaurs. Memoirs of the Peabody Museum of Natural History 3(3):1-175 [M. Carrano/M. Carrano/M. Carrano] |