Cifelli #2 Eolambia caroljonesa Quarry (20.2) (Cretaceous of the United States)

Also known as CEUM locality 42em432v, Eo2, Eolambia II

Where: Emery County, Utah (38.7° N, 111.3° W: paleocoordinates 40.0° N, 73.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)

• A radiometric age of 98.37 ± 0.07 Ma was obtained by the OMNH from volcanic ash within the Mussentuchit Member (Cifelli and others, 1997, 1999). Additional ages by Garrison and others (2007) ranging from 96.7 ± 0.5 to 98.2 ±0.6 Ma indicate that the Mussentuchit Member was deposited over an interval of 1.5 Ma during the early Cenomanian and supports a correlation with the siliceous marine Mowry Shale to the north, which is well-constrained from 40Ar/39Ar sanidine ages obtained from bentonite beds that bracket the Mowry in Wyoming; the basal Arrow Creek Bentonite is 98.5 ± 0.5 Ma and the capping Clay Spur Bentonite is 97.2 ± 0.7 Ma (Obradovich, 1993; Ogg and Hinnov, 2012; Sprinkel and others, 2012) near the base of the Upper Cretaceous. Tucker et al. 2020 also suggested a likely depositional age of ~96-94Ma for the Musseuntuchit member.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; volcaniclastic, gray, yellow claystone

• a "mudflat-transgressive lag deposition system" with local conditions suggestive of lacustrine final deposition as a regressive lag
• "light gray yellow bentonite"

Size classes: macrofossils, mesofossils

Preservation: replaced with calcite, replaced with silica, replaced with pyrite

Collection methods: quarrying, surface (in situ), mechanical,

Primary reference: J. H. Bird, D. Burge, and M. Cicconetti. 2002. An analysis of disarticulated juvenile Eolambia bones in the Cedar Mountain Formation of eastern Utah. Journal of Vertebrate Paleontology 22(3 (suppl.)):37A [M. Carrano/M. Carrano]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 73611: authorized by Matthew Carrano, entered by Matthew Carrano on 21.06.2007, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Dinosauria -
Dinosauria indet.1 dinosaur
eggshell
 Ornithischia -
Eolambia caroljonesa1 Kirkland 1998 ornithopod
 Ornithischia - Hypsilophodontidae
Hypsilophodontidae indet.1 hypsilophodontid
 Loricata -
Mesoeucrocodylia indet.2 Whetstone and Whybrow 1983 crocodilian
 Loricata - Pholidosauridae
 Loricata -
Eusuchia indet.1 Huxley 1875 crocodilian
Bernissartia "sp. 1"1 Dollo 1883 crocodilian
Bernissartia "sp. 2"1 Dollo 1883 crocodilian
 Testudinata -
Testudinata indet. Oppel 1811 turtle
Mammalia
  -
Mammalia indet.1 Linnaeus 1758 mammal
Amphibia
 Caudata -
Caudata indet.1 salamander
Actinopteri
 Neopterygii -
 Lepisosteiformes -
cf. Lepidotes sp.1 Agassiz 1832 gar
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp.1 Agassiz 1843 gar
 Pycnodontiformes - Pycnodontidae
? Pycnodontidae indet.1 Agassiz 1833