CEUM Loc. #42GR 190v (Cretaceous of the United States)

Also known as 42Gr190V, Nedcolbertia Site

Where: Grand County, Utah (38.8° N, 109.6° W: paleocoordinates 37.2° N, 59.1° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Yellow Cat Member (Cedar Mountain Formation), Valanginian (139.8 - 132.9 Ma)

• base of upper part of member

•Detrital zircons from the quarry and adjacent, lateral equivalents provide a maximum depositional age of 125 Ma, indicating the horizon is no older than early Albian (Eberth et al., 2006), but more recent work indicates that the upper part of the Yellow Cat Member is Valanginian (Joeckel et al. 2020)

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; green, red, sandy claystone

• "a drab, green-mauve claystone resting directly on a thick nodular calcrete...One-cm-thick partings filled with sand bisect the juvenile specimen...These are interpreted as representing mudcracks." Some barite crystals

Size classes: macrofossils, mesofossils

Collection methods: quarrying, mechanical,

Primary reference: J. I. Kirkland, B. B. Britt, S. K. Madsen and D. Burge. 1995. A small theropod from the basal Cedar Mountain Formation (Lower Cretaceous, Barremian) of eastern Utah. Journal of Vertebrate Paleontology 15(3, suppl.):39A [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 52352: authorized by Matthew Carrano, entered by Matthew Carrano on 03.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Turtle shell; croc teeth; lungfish tooth plates; hybodont shark spine
Reptilia
 Theropoda -
Nedcolbertia justinhoffmanni n. gen. n. sp.1 Kirkland et al. 1998 coelurosaur
CEUM 5071, 5072, 5073
 Loricata -
Crocodylia indet.1 crocodilian
Osteichthyes
 Dipnoi - Ceratodontidae
Ceratodus sp.2 Agassiz 1838 lungfish
Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodontidae indet.1 Agassiz 1834 elasmobranch