Zerbst Ranch Tracksite (Cretaceous of the United States)

Where: Niobrara County, Wyoming (43.4° N, 104.7° W: paleocoordinates 49.9° N, 79.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Lance Formation, Lancian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: fluvial; sandstone and fine-grained sandstone

• channel sandstone overlain by short-lived pond deposits
• "sandstone that fines upward from fine-graned trough crossbedded sandstone to rippled very finegrained sandstone and siltstone"

Size class: macrofossils

Preservation: cast, mold/impression, soft parts

Collection methods: quarrying,

Primary reference: M. G. Lockley, G. Nadon, and P. J. Currie. 2003. A diverse dinosaur-bird footprint assemblage from the Lance Formation, Upper Cretaceous, eastern Wyoming; implications for ichnotaxonomy. Ichnos 11:229-249 [M. Carrano/K. Maguire/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 60172: authorized by Matthew Carrano, entered by Kaitlin Maguire on 04.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Ornithischia - Iguanodontipodidae
Hadrosauropodus sp. Lockley et al. 2003 ornithopod
Aves
  -
Aves "indet. B" Linnaeus 1758 bird
footprints
Aves "indet. C" Linnaeus 1758 bird
footprints
Aves "indet. D" Linnaeus 1758 bird
footprints
 Charadriiformes -
Sarjeantopodus semipalmatus n. gen. n. sp. Lockley et al. 2003 shorebird
Reptilia
 Theropoda -
Saurexallopus zerbsti n. sp. Lockley et al. 2003 maniraptoran
 Theropoda - Ornithomimidae
Ornithomimidae indet. Marsh 1890 ornithomimid
footprints
 Theropoda - Tyrannosauridae
Tyrannosaurus sp. Osborn 1905 tyrant lizard
footprints