Quarry 1, Como Bluff (YPM): Kimmeridgian - Tithonian, Wyoming
collected by W. Reed, W. Carlin, & S. Williston 1877–1878, 1887

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
Mammalia indet. Linnaeus 1758
Ostrom and McIntosh 1999 1 specimen
tooth
Mammalia - Dryolestidae
Dryolestes sp. Marsh 1878
Breithaupt 1990 1 specimen
jaw
Reptilia
Creosaurus atrox n. gen., n. sp. Marsh 1878
Marsh 1878 2 individuals
synonym of Allosaurus fragilis
YPM 1890
Reptilia - Camarasauridae
Apatosaurus grandis n. sp. Marsh 1877
3 specimens
recombined as Camarasaurus grandis
YPM 1901, 1903, 1905 (5 measurements)
Morosaurus robustus n. sp. Marsh 1878
Marsh 1878 1 individual
synonym of Camarasaurus grandis
YPM 1902
Pleurocoelus montanus n. sp. Marsh 1896
Marsh 1896 1 individual
synonym of Camarasaurus grandis
YPM 1908
Morosaurus impar n. gen., n. sp. Marsh 1878
Marsh 1878 1 specimen
synonym of Camarasaurus grandis
YPM 1900
Reptilia
Diplodocus sp. Marsh 1878
Ostrom and McIntosh 1999 1 individual
see common names

Geography
Country:United States State/province:Wyoming County:Albany
Coordinates: 41.9° North, 106.0° West (view map)
Paleocoordinates:37.5° North, 52.2° West
Basis of coordinate:stated in text
Altitude:7000 feet
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Late/Upper Jurassic
*Period:Late/Upper Jurassic *Epoch:Malm
*International age/stage:Kimmeridgian - Tithonian
Key time interval:Kimmeridgian - Tithonian
Age range of interval:157.30000 - 145.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Morrison
Stratigraphic resolution:bed
Stratigraphy comments: referred to in paper as "Atlantosaurus Beds" and "Como Beds"; upper middle part of formation
Lithology and environment
Primary lithology: claystone
Includes fossils?Y
Environment:wet floodplain
Geology comments: poorly drained floodplain
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:good
Associated major elements:some
Disassociated major elements:many
Fragmentation:occasional
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:general faunal/floral analysis
Museum repositories:YPM
Collectors:W. Reed, W. Carlin, & S. Williston Collection dates:1877–1878, 1887
Metadata
Also known as:WY-21
Database number:13212
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2002-01-29 12:55:06 Last modified:2023-11-21 16:41:43
Access level:the public Released:2002-01-29 12:55:06
Creative Commons license:CC BY
Reference information

Primary reference:

7811. O. C. Marsh. 1877. Notice of new dinosaurian reptiles from the Jurassic formation. American Journal of Science and Arts 14:514-516 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

77734 B. H. Breithaupt. 1990. Biography of William Harlow Reed: the story of a frontier fossil collector. Earth Sciences History 9(1):6-13 [M. Carrano/M. Carrano]
14211ETE K. Carpenter and J. McIntosh. 1994. Upper Jurassic sauropod babies from the Morrison Formation. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies 265-278 [M. Carrano/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]
19565ETE J. R. Foster. 2005. New juvenile sauropod material from western Colorado, and the record of juvenile sauropods from the Upper Jurassic Morrison Formation. In K. Carpenter and V. Tidwell (eds.), Thunder-Lizards: The Sauropodomorph Dinosaurs. Indiana University Press, Bloomington 141-153 [M. Carrano/M. Carrano/M. Carrano]
12748ETE P. M. Galton. 1981. A juvenile stegosaurian dinosaur, "Astrodon pusillus," from the Upper Jurassic of Portugal, with comments on Upper Jurassic and Lower Cretaceous biogeography. Journal of Vertebrate Paleontology 1(3-4):245-256 [M. Carrano/M. Carrano/M. Carrano]
52132 T. Ikejiri. 2005. Distribution and biochronology of Camarasaurus (Dinosauria, Sauropoda) from the Jurassic Morrison Formation of the Rocky Mountain region. In S. G. Lucas, K. E. Ziegler, V. W. Lueth, D. E. Owen (eds.), New Mexico Geological Society, 56th Field Conference, Geology of the Chama Basin. New Mexico Geological Society Guidebook 56:367-379 [M. Carrano/M. Carrano/P. Wagner]
86556 R. Lei, E. Tschopp, C. Hendrickx, M. J. Wedel, M. A. Norell and D. W. E. Hone. 2023. Bite and tooth marks on sauropod dinosaurs from the Morrison Formation. PeerJ 11:16327:1-34 [M. Carrano/M. Carrano]
7813 O. C. Marsh. 1878. Notice of new dinosaurian reptiles. American Journal of Science and Arts 15:241-244 [M. Carrano/M. Carrano/M. Carrano]
7803 O. C. Marsh. 1878. Principal characters of American Jurassic dinosaurs. Part I. American Journal of Science and Arts 16:411-416 [M. Carrano/M. Carrano/M. Carrano]
14074ETE O. C. Marsh. 1896. The dinosaurs of North America. United States Geological Survey, 16th Annual Report, 1894-95 55:133-244 [M. Carrano/M. Carrano/M. Carrano]
46207 J. S. McIntosh. 1981. Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of the Carnegie Museum of Natural History. Bulletin of Carnegie Museum of Natural History 18:1-67 [M. Carrano/M. Carrano/M. Carrano]
69430 R. L. Moodie. 1930. The Dinosaurs of Wyoming 22:1-119 [M. Carrano/M. Carrano]
10618 J. H. Ostrom and J. S. McIntosh. 1999. Marsh's Dinosaurs: The Collections from Como Bluff. Yale University Press, New Haven 1-388 [M. Carrano/M. Carrano/M. Carrano]
13281ETE C. E. Turner and F. Peterson. 1999. Biostratigraphy of dinosaurs in the Upper Jurassic Morrison Formation of the Western Interior, U.S.A. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publication 99-1:77-114 [M. Carrano/M. Carrano/M. Carrano]
43875% 37840S. W. Williston. 1901. The dinosaurian genus Creosaurus, Marsh. American Journal of Science, series 4 11(11):111-114 [M. Carrano/M. Carrano/J. Alroy]