Also known as UCM Loc. 77062; DMNH loc. 3426; UWBM loc. C1099
Where: Weld County, Colorado (40.4° N, 104.5° W: paleocoordinates 46.9° N, 80.4° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Laramie Formation, Lancian (70.6 - 66.0 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: "floodplain"; gray mudstone and yellow sandstone
•"an off-channel and overbank depositional environment" (Wilson et al. 2010)
•"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)
Size classes: macrofossils, mesofossils
Collected by K. Carpenter in 1977; reposited in the DMNH, UCM
Collection methods: bulk, chemical, sieve,
• "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
Primary reference: 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]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 14640: authorized by John Alroy, entered by John Alroy on 27.09.1993, edited by Matthew Carrano, Roger Benson and Patricia Holroyd
Creative Commons license: CC BY (attribution)
Taxonomic list
Chondrichthyes | |
Lonchidion selachos Estes 1964 elasmobranch | |
Myledaphus bipartitus Cope 1876 guitarfish | |
Ischyrhiza cf. avonicola Estes 1964 ray | |
"Squatirhina americana" = Restesia americana
"Squatirhina americana" = Restesia americana Estes 1964 wobbegong | |
Amphibia | |
Caudata indet. salamander | |
Opisthotriton kayi Auffenberg 1961 salamander | |
Scapherpeton tectum Cope 1876 salamander
Lisserpeton bairdi Estes 1965 salamander | |
| |
Mammalia | |
Mammalia indet. Linnaeus 1758 mammal | |
Multituberculata indet. Cope 1884 multituberculate | |
Meniscoessus sp. Cope 1882 multituberculate
Cimolomys sp. Marsh 1889 multituberculate | |
| |
Gypsonictops sp. Simpson 1927 eutherian | |
Reptilia | |
Compsemys victa Leidy 1856 turtle | |
| |
Testudines indet. Batsch 1788 turtle | |
Adocus sp. Cope 1868 turtle | |
| |
Odaxosaurus piger Gilmore 1928 squamates | |
Chamopsiidae "Laramie chamopsiid"4 Denton and O'Neill 1995 squamates UCM 42164: an unnamed chamopsiid from Colorado (Fig. 1C), characterized by enlarged back teeth
| |
Crocodylidae indet. crocodile | |
Brachychampsa montana Gilmore 1911 crocodilian | |
"Leidyosuchus sternbergi" = Borealosuchus sternbergii
"Leidyosuchus sternbergi" = Borealosuchus sternbergii Gilmore 1910 crocodilian | |
Ornithischia indet. ornithischian | |
Triceratops sp. Marsh 1889 ceratopsid | |
Thescelosaurus sp. Gilmore 1913 ornithopod | |
Dromaeosauridae indet. Colbert and Russell 1969 maniraptoran | |
cf. Tyrannosaurus rex Osborn 1905 tyrant lizard king | |
Sauria indet. diapsid | |
Champsosaurus sp. Cope 1876 choristodere | |
Actinopteri | |
"? Atractosteus occidentalis" = Lepisosteus occidentalis
"? Atractosteus occidentalis" = Lepisosteus occidentalis Leidy 1856 gar | |
Amia sp. Linnaeus 1766 bowfin | |