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
Ceratopsidae indet. Marsh 1888
teeth
Reptilia
? Deinodon sp. Leidy 1856
1 specimen
nomen dubium belonging to Tyrannosauroidea
teeth
Reptilia - Crocodilia
Crocodilia indet. Owen 1842
spelled with current rank as Crocodylia
teeth, scute
Actinopteri - Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843
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:

12314ETE 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]