Fossil eggshells from Utah's Cedar Mountain Formation include Cretaceous period eggs from 3 feathered bird-like dinosaurs, 2 herbivorous dinosaurs, and a crocodile-like species found for the first time outside Europe
PLOS
image:
Graphical abstract of the manuscript.
view moreCredit: Ryan Tucker and Josh Hedge, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Article URL: https://plos.io/42XpPYx
Article title: Fossil eggshell diversity of the Mussentuchit Member, Cedar Mountain Formation, Utah
Author countries: U.S., South Africa
Funding: This research was supported by Canyonlands Natural History Association, Global Creatures, and MagicSpace Entertainment (2014–2015) and the National Science Foundation (awards 1925973 to LEZ and 1925884 to PJM). Any opinions, findings, conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation or other funding agencies. https://www.nsf.gov https://cnha.org https://global-creatures.com https://www.magicspace.net.
Fossil eggshell diversity of the Mussentuchit Member, Cedar Mountain Formation, Utah 
Prospecting for eggshells in Utah, 2020.
Credit
Lindsay Zanno, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Features of Undulatoolithus fragment NCSM 33729. A) surface view of NCSM 33729. Red line indicates where thin section was made (dashed where not seen in the radial thin sections). B) NCSM 33729 in radial thin section. Tailed scale bar marks very high, undulating ornamentation. Gradational ML/CL boundary marked with solid black lines; accretion lines in CL shown with dashed black lines; arrows and black fill show infilled pores. C) radial thin section under crossed polars. Scale bars equal 10 mm.
Credit
Hedge et al., 2025, PLOS One, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Journal
PLOS One
Article Title
Fossil eggshell diversity of the Mussentuchit Member, Cedar Mountain Formation, Utah
Article Publication Date
26-Feb-2025
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