Ken's Site: Lancian, Colorado
collected by K. Carpenter 1977
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Ornithischia
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Ornithischia indet.
Seeley 1888
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4 specimens | |||||||||
Reptilia
- Ceratopsidae
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Triceratops sp.
Marsh 1889
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Reptilia
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Thescelosaurus sp.
Gilmore 1913
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Reptilia
- Dromaeosauridae
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Dromaeosauridae indet.
Colbert and Russell 1969
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Reptilia
- Tyrannosauridae
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cf. Tyrannosaurus rex
Osborn 1905
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Reptilia
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Leidyosuchus sternbergi
(Gilmore 1910)
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recombined as Borealosuchus sternbergii | ||||||||||
Reptilia
- Crocodylidae
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Crocodylidae indet.
Cuvier 1807
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2 specimens | |||||||||
Reptilia
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Brachychampsa montana
Gilmore 1911
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Champsosaurus sp.
Cope 1876
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Reptilia
- Sauria
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Sauria indet.
MacCartney 1802
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2 specimens | |||||||||
Reptilia
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Compsemys victa
(Leidy 1856)
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Reptilia
- Baenidae
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Baenidae indet.
Cope 1882
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Hutchison and Holroyd 2003 | |||||||||
Reptilia
- Testudines
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Testudines indet.
Batsch 1788
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2 specimens | |||||||||
Reptilia
- Testudines
- Adocidae
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Adocus sp.
Cope 1868
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Adocus sp.
Cope 1868
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Hutchison and Holroyd 2003 | |||||||||
Reptilia
- Testudines
- Trionychidae
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Trionyx sp.
Geoffroy Saint-Hilaire 1809
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subgenus Adocus | ||||||||||
= Trionychidae indet.
Gray 1825
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Alroy 2006 | |||||||||
Trionychidae indet.
(Gray 1825)
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Hutchison and Holroyd 2003 | |||||||||
Trionychinae indet.
Gray 1825
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Hutchison and Holroyd 2003 | |||||||||
Reptilia
- Anguidae
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Odaxosaurus piger
(Gilmore 1928)
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Reptilia
- Chamopsiidae
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Chamopsiidae informal Laramie chamopsiid
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Longrich et al. 2012 | 1 specimen | ||||||||
UCM 42164: an unnamed chamopsiid from Colorado (Fig. 1C), characterized by enlarged back teeth | ||||||||||
Mammalia
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Mammalia indet.
Linnaeus 1758
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Mammalia
- Gypsonictopidae
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Gypsonictops sp.
Simpson 1927
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Mammalia
- Multituberculata
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Multituberculata indet.
Cope 1884
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Mammalia
- Multituberculata
- Cimolodontidae
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cf. Cimolodon sp.
Marsh 1889
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Wilson et al. 2010 | |||||||||
UWBM specimen | ||||||||||
Mammalia
- Multituberculata
- Cimolomyidae
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Meniscoessus sp.
Cope 1882
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Cimolomys sp.
Marsh 1889
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Amphibia
- Temnospondyli
- Albanerpetontidae
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Albanerpeton sp.
Estes and Hoffstetter 1976
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2 specimens | |||||||||
UCM 38713, 38714 | ||||||||||
= Albanerpeton nexuosus
Estes 1981
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Gardner 2000 | |||||||||
Amphibia
- Temnospondyli
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Caudata indet.
Scopoli 1777
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7 specimens | |||||||||
Amphibia
- Temnospondyli
- Batrachosauroididae
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Opisthotriton kayi
Auffenberg 1961
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Amphibia
- Temnospondyli
- Urodela
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Scapherpeton tectum
Cope 1876
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Lisserpeton bairdi
Estes 1965
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Actinopteri
- Lepisosteiformes
- Lepisosteidae
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? Atractosteus occidentalis
(Leidy 1856)
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original and current combination Lepidotus occidentalis | ||||||||||
Actinopteri
- Amiiformes
- Amiidae
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Amia sp.
Linnaeus 1766
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Actinopteri
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Teleostei indet.
MĂĽller 1846
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9 specimens | |||||||||
Chondrichthyes
- Hybodontiformes
- Lonchidiidae
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Lonchidion selachos
Estes 1964
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Chondrichthyes
- Orectolobiformes
- Orectolobidae
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Squatirhina americana
Estes 1964
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recombined as Restesia americana | ||||||||||
Chondrichthyes
- Rajiformes
- Sclerorhynchidae
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Ischyrhiza cf. avonicola
Estes 1964
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Chondrichthyes
- Rajiformes
- Rhinobatidae
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Myledaphus bipartitus
Cope 1876
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see common names |
Geography
Country: | United States | State/province: | Colorado | County: | Weld |
Coordinates: | 40.4° North, 104.5° West (view map) | ||||
Paleocoordinates: | 46.9° North, 80.4° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Geographic resolution: | small collection |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
*Period: | Late/Upper Cretaceous | *Epoch: | Senonian |
Key time interval: | Lancian | ||
Age range of interval: | 70.60000 - 66.00000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Laramie | ||
Regional section: | Pawnee National Grassland | Regional bed: | 95 m |
Regional order: | bottom to top | ||
Stratigraphic resolution: | group of beds |
Lithology and environment
Primary lithology: | gray mudstone |
Secondary lithology: | "cross stratification",yellow sandstone |
Includes fossils? | Y |
Lithology description: "dark silty shales and clays of overbank deposits overlain by a yellow cross-bedded, lenticular sandstone" (Carpenter 1979) "upper very fine to lower fine sandstone beds alternating with grey mudstone and siltstone beds with ripple marks" with "abundant iron oxide concretions and weathered layers, especially near the top of the section, which is about 5 m high"; "most fossils... are found at the base of the exposures in a dark grey mudstone layer" (Wilson et al. 2010) | |
Environment: | "floodplain" |
Geology comments: "channel and overbank deposits" (Carpenter 1979)
"an off-channel and overbank depositional environment" (Wilson et al. 2010) |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils,mesofossils |
Articulated whole bodies: | none |
Associated major elements: | some |
Disassociated major elements: | some |
Disassociated minor elements: | many |
Collection methods and comments
Collection methods: | bulk,chemical,sieve,field collection | ||
Collection size: | 11 specimens | ||
Rock censused: | 300 kg | ||
Reason for describing collection: | taxonomic analysis | ||
Museum repositories: | DMNH,UCM | ||
Collectors: | K. Carpenter | Collection dates: | 1977 |
Collection method comments: "laboratory washing and screening" with matrix "soaked overnight in hydrogen peroxide"; "~300 kg" were screened by Carpenter in 1977 according to Wilson et al. 2010 |
Metadata
Also known as: | UCM Loc. 77062; DMNH loc. 3426; UWBM loc. C1099 | ||
Database number: | 14640 | ||
Authorizer: | J. Alroy, R. Benson, P. Holroyd, M. Carrano | Enterer: | J. Alroy, M. Carrano, R. Benson, P. Holroyd |
Modifier: | M. Carrano | Research group: | vertebrate |
Created: | 1993-09-27 00:00:00 | Last modified: | 2017-07-14 15:23:40 |
Access level: | the public | Released: | 1993-09-27 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
717. | K. Carpenter. 1979. Vertebrate fauna of the Laramie Formation (Maestrichtian), Weld County, Colorado. Contributions to Geology, University of Wyoming 17(1):37-49 [J. Alroy/M. Sommers] |
Secondary references:
18120 | J. Alroy. 2006. Synonymies and reidentifications of North American fossil vertebrates. [J. Alroy/J. Alroy/J. Alroy] | |
42675 | J. D. Gardner. 2000. Albanerpetontid amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America. Geodiversitas 22(3):349-388 [M. Carrano/M. Carrano/M. Carrano] | |
14441 | ETE | P. A. Holroyd and J. H. Hutchison. 2002. Late Cretaceous and Early Paleocene turtle biogeography: new data from the Denver Basin, Colorado. GSA Abstracts with Programs [M. Carrano/M. Carrano/P. Holroyd] |
26071 | J. H. Hutchison and P. A. Holroyd. 2003. Late Cretaceous and early Paleocene turtles of the Denver Basin, Colorado. Rocky Mountain Geology 38(1):121-142 [P. Holroyd/P. Holroyd] | |
43992 | N. R. Longrich, B.-A. S. Bhullar, and J. A. Gauthier. 2012. Mass extinction of lizards and snakes at the Cretaceous–Paleogene boundary. Proceedings of the National Academy of Sciences 109(52):21396-21401 [R. Benson/R. Benson/T. Liebrecht] | |
61518 | D. B. Weishampel and J. B. Weishampel. 1983. Annotated localities of ornithopod dinosaurs: implications to Mesozoic paleobiogeography. The Mosasaur 1:43-87 [M. Carrano/M. Carrano] | |
32620 | G. P. Wilson, M. Dechesne, and I. R. Anderson. 2010. New latest Cretaceous mammals from northeastern Colorado with biochronologic and biogeographic implications. Journal of Vertebrate Paleontology 30(2):499-520 [J. Alroy/J. Alroy] |