Egg Gulch, MOR TM-008 (Cretaceous of the United States)

Where: Teton County, Montana (47.8° N, 112.2° W: paleocoordinates 55.3° N, 77.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Two Medicine Formation (Montana Group), Campanian (83.6 - 72.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; lithified, brown, gray mudstone

• see lithology description
• nests found at an equal depth beneath a paleosol, incorporated in a grey-brown mudstone interpreted as a floodplain deposit.

Size class: macrofossils

Preservation: trace

Collection methods: quarrying, mechanical, hydrochloric,

Primary reference: J. R. Horner. 1982. Evidence of colonial nesting and "site fidelity" among ornithischian dinosaurs . Nature 297(5868):675-676 [M. Carrano/M. Carrano/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13282: authorized by Matthew Carrano, entered by Matthew Carrano on 13.02.2002, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Ornithischia - Hadrosauridae
Maiasaura peeblesorum
Maiasaura peeblesorum Horner and Makela 1979 hadrosaurine
 Ornithischia - Spheroolithidae
Spheroolithus albertensis3
Spheroolithus albertensis3 Zelenitsky and Hills 1997 ornithopod
 Theropoda -
Theropoda indet.1
 Avetheropoda -
Carnosauria indet.1
Amphibia
 Salientia -
Anura "Unnamed genus and species I"2
Anura "Unnamed genus and species I"2 Fischer von Waldheim 1813 frog
MOR 938, skeleton
1Database 2006; 2Gardner et al. 2016; 3Zelenitsky 2000