Windy City, Rattlesnake Mountain, Big Bend: Middle Campanian - Late/Upper Campanian, Texas
collected by P. C. Sereno, C. A. Forster, J. T. Sankey 1989-1991, 2000-2007

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Plantae indet. Haeckel 1866
Gasaway et al. 2007
"plants"
Gastropoda
Gastropoda indet. Cuvier 1795
Gasaway et al. 2007
"snails"
Reptilia - Dinosauria
Dinosauria indet. Owen 1842
Gasaway et al. 2007
4 additional types of eggshell
Reptilia
Ankylosauria indet. Osborn 1923
Gasaway et al. 2007
Ceratopsia indet. Marsh 1890
Gasaway et al. 2007
Reptilia - Ceratopsidae
Chasmosaurus mariscalensis Lehman 1989
2 individuals
recombined as Agujaceratops mariscalensis
TMM 43098-1
Reptilia - Hadrosauridae
Hadrosauridae indet. Cope 1869
LSUMG 842:8397
Reptilia - Theropoda
Theropoda indet. Marsh 1881
Gasaway et al. 2007
Reptilia - Dromaeosauridae
cf. Saurornitholestes sp. Sues 1978
Gasaway et al. 2007
Reptilia
Aves indet. Linnaeus 1758
Gasaway et al. 2007
"birds"
Reptilia - Ornithomimidae
Ornithomimidae indet. Marsh 1890
Gasaway et al. 2007
Reptilia - Tyrannosauridae
Tyrannosauridae indet. Osborn 1906
Gasaway et al. 2007
LSUMG 842:17876
Reptilia - Elongatoolithidae
Porituberoolithus sp. Zelenitsky et al. 1996
Sankey 2010
Continuoolithus sp. Zelenitsky et al. 1996
Sankey 2010
Reptilia - Pterosauria
Pterosauria indet. Kaup 1834
Gasaway et al. 2007
Reptilia - Crocodylia
Crocodylia indet. (Owen 1842)
Gasaway et al. 2007
Reptilia - Baenidae
Baenidae indet. Cope 1882
Gasaway et al. 2007
Reptilia - Testudines - Adocidae
Adocus sp. Cope 1868
Gasaway et al. 2007
Reptilia - Testudines - Kinosternoidea
cf. Hoplochelys sp. Hay 1908
Gasaway et al. 2007
Reptilia - Testudines - Nanhsiungchelyidae
Basilemys sp. Hay 1902
Gasaway et al. 2007
Reptilia - Testudines
cf. Helopanoplia sp. Hay 1908
Gasaway et al. 2007
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Gasaway et al. 2007
Reptilia - Lacertilia
Lacertilia indet. Owen 1842
Gasaway et al. 2007
"lizard"
Mammalia
Mammalia indet. Linnaeus 1758
Gasaway et al. 2007
"mammal"
Amphibia - Temnospondyli
Caudata indet. Scopoli 1777
Gasaway et al. 2007
"salamander"
see common names

Geography
Country:United States State/province:Texas County:Brewster
Coordinates: 29.2° North, 103.6° West (view map)
Paleocoordinates:35.7° North, 77.1° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
*Period:Late/Upper Cretaceous *Epoch:Senonian
*International age/stage:Late/Upper Campanian
Key time interval:Middle Campanian - Late/Upper Campanian
Age range of interval:83.50000 - 70.60000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Aguja Member:Upper Shale
Local section:Purple Hill Local bed:1 m
Local order:bottom to top
Stratigraphic resolution:bed
Lithology and environment
Primary lithology:paleosol/pedogenic,very fine,fine,nodular,green lithified muddy sandstone
Secondary lithology: silty mudstone
Includes fossils?Y
Lithology description: "silty mudstone to fine sandstone"; very fine to fine grained muddy sandstone, light olive gray, poorly sorted, moderately well indurated; abundant clay balls, pedogenic carbonate nodules
Environment:crevasse splay
Geology comments: "a crevasse splay into a marshy area of a coastal floodplain"
Taphonomy
Modes of preservation:body
Lagerst�tten type:concentrate
Degree of concentration:-bonebed
Size of fossils:macrofossils,mesofossils,microfossils
Preservation of anatomical detail:good
Associated major elements:some
Disassociated major elements:many
Disassociated minor elements:many
Size sorting:poor
Fragmentation:occasional
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:some genera,some macrofossils,species names
Collection methods:bulk,selective quarrying,surface (float),surface (in situ),mechanical,sieve,field collection,observed (not collected)
Reason for describing collection:taxonomic analysis
Collectors:P. C. Sereno, C. A. Forster, J. T. Sankey Collection dates:1989-1991, 2000-2007
Metadata
Also known as:LSUMG 842, VL-842, TMM 43098
Database number:25073
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:G. Varnham Research group:vertebrate
Created:2002-08-27 14:15:24 Last modified:2022-02-24 04:41:25
Access level:the public Released:2002-08-27 14:15:24
Creative Commons license:CC BY
Reference information

Primary reference:

7029. C. A. Forster, P. C. Sereno, T. W. Evans and T. Rowe. 1993. A complete skull of Chasmosaurus mariscalensis (Dinosauria, Ceratopsidae) from the Aguja Formation (late Campanian) of west Texas. Journal of Vertebrate Paleontology 13(2):161-170 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

17240ETE C. A. Forster and P. C. Sereno. 1993. Chasmosaurus mariscalensis skull from Big Bend National Park. In V. Santucci (ed.), National Park Service Paleontology Research Abstract Volume. Technical Report NPS/NRPEFO/NRTR 93/11:14 [M. Carrano/M. Carrano/M. Uhen]
25812ETE S. Gasaway, J. T. Sankey, N. Oritz and V. Meredith. 2007. Paleoecology of a Chasmosaurus mariscalensis bonebed, Late Cretaceous (late Campanian), Big Bend National Park, Texas. Journal of Vertebrate Paleontology 27(3, suppl.):79A [M. Carrano/M. Carrano]
70549 T. Konishi. 2015. Redescription of UALVP 40, an unusual specimen of Chasmosaurus Lambe, 1914 (Ceratopsidae: Chasmosaurinae) bearing long postorbital horns, and its implications for ontogeny and alpha taxonomy of the genus. Canadian Journal of Earth Sciences 52(8):608-619 [M. Carrano/M. Carrano]
48987 T. M. Lehman. 2007. Growth and population age structure in the horned dinosaur Chasmosaurus. In K. Carpenter (ed.), Horns and Beaks: Ceratopsian and Ornithischian Dinosaurs 259-317 [M. Carrano/M. Carrano]
36226ETE J. T. Sankey. 2010. Faunal composition and significance of high-diversity, mixed bonebeds containing Agujaceratops mariscalensis and other dinosaurs, Aguja Formation (Upper Cretaceous), Big Bend, Texas. In M. J. Ryan, B. J. Chinnery-Allgeier, D. A. Eberth (eds.), New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Indiana University Press, Bloomington 520-537 [M. Carrano/M. Carrano]