Egg Gulch, Garden Park: Early/Lower Kimmeridgian, Colorado
collected 1991

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Dinosauria
? Dinosauria indet. Owen 1842
Alf 1998
second egg type, "dinosaurian or perhaps even avian"
Reptilia - Dryosauridae
? Dryosaurus sp. Marsh 1894
Carpenter 1998 1 individual
Reptilia - Prismatoolithidae
Prismatoolithus coloradensis Hirsch 1994
Carpenter 1998
recombined as Preprismatoolithus coloradensis
ornithopod eggs
Reptilia - Crocodylia
Crocodylia indet. (Owen 1842)
Foster 2003 1 individual
unclassified
Charophyta indet. Migula 1890
Alf 1998
see common names

Geography
Country:United States State/province:Colorado County:Fremont
Coordinates: 38.5° North, 105.2° West (view map)
Paleocoordinates:33.7° North, 51.8° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Jurassic Epoch:Late/Upper Jurassic
Stage:Kimmeridgian 10 m.y. bin:Jurassic 5
Key time interval:Early/Lower Kimmeridgian
Age range of interval:154.80000 - 152.20000 m.y. ago
Stratigraphy
Formation:Morrison Member:Salt Wash
Stratigraphic resolution:bed
Stratigraphy comments: age based on charophytes
Lithology and environment
Primary lithology: mudstone
Secondary lithology: sandstone
Includes fossils?Y
Environment:lacustrine indet.
Geology comments: lacustrine setting in a poorly drained floodplain environment
Taphonomy
Modes of preservation:body
Degree of concentration:concentrated
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:medium
Associated major elements:some
Disassociated major elements:some
Disassociated minor elements:many
Fragmentation:frequent
Collection methods and comments
Collection methods:bulk,selective quarrying,surface (float),surface (in situ),mechanical,sieve,field collection
Reason for describing collection:taxonomic analysis
Collection dates:1991
Metadata
Also known as:CO-72
Database number:48156
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2005-03-15 09:58:06 Last modified:2010-12-02 20:39:57
Access level:the public Released:2005-03-15 09:58:06
Creative Commons license:CC BY
Reference information

Primary reference:
14689.ETE K. Alf and K. Carpenter. 1993. Preliminary results of a study of an eggshell site in the Morrison Formation of Colorado. Journal of Vertebrate Paleontology 13(3, suppl.):24A [M. Carrano/M. Carrano]

Secondary references:

15173ETE K. Alf. 1998. Preliminary study of an eggshell site in the Morrison Formation of Colorado. Modern Geology 23(1-4):241-248 [M. Carrano/M. Carrano]
15174ETE E. S. Bray and K. F. Hirsch. 1998. Eggshell from the Upper Jurassic Morrison Formation. Modern Geology 23(1-4):219-240 [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]
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]
14216ETE K. F. Hirsch. 1994. Upper Jurassic eggshells from the Western Interior of North America. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies, Cambridge University Press, Cambridge 137-150 [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]