Ken's Site (Cretaceous of the United States)

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

• "channel and overbank deposits" (Carpenter 1979)

•"an off-channel and overbank depositional environment" (Wilson et al. 2010)

• "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)

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
 Sclerorhynchiformes - Sclerorhynchidae
Ischyrhiza cf. avonicola Estes 1964 cartilaginous fish
 Hybodontiformes - Lonchidiidae
Lonchidion selachos Estes 1964 elasmobranch
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
 Orectolobiformes - Orectolobidae
Squatirhina americana Estes 1964 wobbegong
Actinopteri
 Teleostei -
 Amiiformes - Amiidae
Amia sp. Linnaeus 1766 bowfin
 Lepisosteiformes - Lepisosteidae
"? Atractosteus occidentalis" = Lepisosteus occidentalis
"? Atractosteus occidentalis" = Lepisosteus occidentalis Leidy 1856 gar
Osteichthyes
 Temnospondyli - Albanerpetontidae
Albanerpeton nexuosus2 Estes 1981 tetrapod
UCM 38713, 38714
 Caudata -
Caudata indet. salamander
 Proteida - Batrachosauroididae
Opisthotriton kayi Auffenberg 1961 salamander
 Caudata - Urodela
Scapherpeton tectum Cope 1876 salamander
Lisserpeton bairdi Estes 1965 salamander
Reptilia
 Testudines -
Testudines indet. Batsch 1788 turtle
 Testudines - Trionychidae
Trionychidae indet.3 Gray 1825 softshell turtle
Trionychidae indet.1 Gray 1825 softshell turtle
subgenus Adocus
Trionychinae indet.3 softshell turtle
 Testudines - Baenidae
Baenidae indet.3 Cope 1882 turtle
 Testudines -
Compsemys victa Leidy 1856 turtle
 Testudines - Adocidae
Adocus sp. Cope 1868 turtle
Adocus sp.3 Cope 1868 turtle
 Sauria -
 Avetheropoda - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969 coelurosaur
 Avetheropoda - Tyrannosauridae
cf. Tyrannosaurus rex Osborn 1905 tyrant lizard king
 Ornithischia -
Ornithischia indet. ornithischian
 Neornithischia - Ceratopsidae
Triceratops sp. Marsh 1889 ceratopsid
 Neornithischia - Thescelosauridae
Thescelosaurus sp. Gilmore 1913 ornithischian
 Crocodylia -
"Leidyosuchus sternbergi" = Borealosuchus sternbergii
"Leidyosuchus sternbergi" = Borealosuchus sternbergii Gilmore 1910 crocodilian
 Crocodylia - Crocodylidae
Crocodylidae indet. Cuvier 1807 crocodile
 Crocodylia - Alligatoridae
Brachychampsa montana Gilmore 1911 crocodilian
 Squamata - Anguidae
Odaxosaurus piger Gilmore 1928 lizard
 Squamata - Chamopsiidae
Chamopsiidae "Laramie chamopsiid"4 Denton and O'Neill 1995 lizard
UCM 42164: an unnamed chamopsiid from Colorado (Fig. 1C), characterized by enlarged back teeth
 Choristodera -
Champsosaurus sp. Cope 1876 choristodere
Mammalia
  -
Mammalia indet. Linnaeus 1758 mammal
 Leptictida - Gypsonictopidae
Gypsonictops sp. Simpson 1927 eutherian
 Allotheria -
Multituberculata indet. Cope 1884 multituberculate
 Multituberculata - Cimolomyidae
Meniscoessus sp. Cope 1882 multituberculate
Cimolomys sp. Marsh 1889 multituberculate
 Multituberculata - Cimolodontidae
cf. Cimolodon sp.5 Marsh 1889 multituberculate
UWBM specimen