Jennings & Robinson locality (YPM): Early/Lower Tithonian, Colorado
collected by J. Jennings, S. C. Robinson, D. Baldwin 1876–1877

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Nanosaurus victor n. sp. Marsh 1877
1 specimen
recombined as Hallopus victor
YPM 1914
see common names

Geography
Country:United States State/province:Colorado County:Fremont
Coordinates: 38.5° North, 105.2° West (view map)
Paleocoordinates:34.5° North, 52.9° West
Basis of coordinate:stated in text
Altitude:1861 meters
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Late/Upper Jurassic
Stage:Tithonian 10 m.y. bin:Jurassic 6
Key time interval:Early/Lower Tithonian
Age range of interval:149.20000 - 146.30000 m.y. ago
Stratigraphy
Formation:Morrison Member:Brushy Basin
Stratigraphic resolution:bed
Stratigraphy comments: probably high in formation, but location debated for many years; the so-called "Hallopus Beds"
Trujillo et al. 2015: Recalibrated 40Ar/39Ar ages from the Morrison Formation suggest Brushy Basin Member is early Tithonian
Lithology and environment
Primary lithology:fine,ferruginous,red argillaceous sandstone
Includes fossils?Y
Lithology description: "brick-red, fine-grained sandstones...poorly sorted...predominately of quartz, K-feldspar, and kaolin-type clays set in dark ferruginous matrix."
Environment:crevasse splay
Taphonomy
Modes of preservation:body
Degree of concentration:dispersed
Size of fossils:macrofossils
Spatial orientation:life position
Preservation of anatomical detail:good
Fragmentation:frequent
Temporal resolution:snapshot
Collection methods and comments
Collection methods:surface (float),mechanical,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:YPM
Collectors:J. Jennings, S. C. Robinson, D. Baldwin Collection dates:1876–1877
Metadata
Also known as:Garden Park, Cañon City, Cope's Nipple, Jennings and Johnson
Database number:48167
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2005-03-15 10:31:51 Last modified:2023-08-23 12:33:52
Access level:the public Released:2005-03-15 10:31:51
Creative Commons license:CC BY
Reference information

Primary reference:
7809. O. C. Marsh. 1877. Notice of some new vertebrate fossils. American Journal of Arts and Sciences 14:249-256 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

13268ETE J. J. Ague, K. Carpenter, and J. H. Ostrom. 1995. Solution to the Hallopus enigma?. American Journal of Science 295:1-17 [M. Carrano/M. Carrano/M. Carrano]
12893ETE K. Carpenter. 1998. Vertebrate biostratigraphy of the Morrison Formation near Cañon City, Colorado. Modern Geology 23:407-426 [M. Carrano/M. Carrano/M. Carrano]
77784 K. Carpenter. 1999. The Cañon City dinosaur sites of Marsh and Cope. Scoiety of Vertebrate Paleontology Annual Meeting 1-14 [M. Carrano/M. Carrano]
15179ETE J. R. Foster. 2003. Paleoecological analysis of the vertebrate fauna of the Morrison Formation (Upper Jurassic), Rocky Mountain region, U.S.A. New Mexico Museum of Natural History and Science Bulletin 23:1-95 [M. Carrano/M. Carrano]
62966 F. v. Huene. 1914. I: Animalia. Pars 4. Saurischia et Ornithischia triadica (“Dinosauria” triadica). 1-20 [M. Carrano/M. Carrano]
54331 R. S. Lull. 1926. Early fossil hunting in the Rocky Mountains. Natural History 26(5):455-461 [M. Carrano/M. Carrano]
7816 O. C. Marsh. 1881. Principal characters of American Jurassic dinosaurs. Part V. The American Journal of Science and Arts, series 3 21:417-423 [M. Carrano/M. Carrano/M. Carrano]
78169 O. C. Marsh. 1897. Vertebrate fossils of the Denver Basin. United States Geological Survey Monograph 27:473-527 [M. Carrano/M. Carrano/M. Carrano]
61465 S. W. Williston. 1915. The first discovery of dinosaurs in the west. In W. D. Matthew (ed.), Dinosaurs. American Museum of Natural History Handbook 5:124-131 [M. Carrano/M. Carrano]