Judith River Group

{{Short description|Group of geologic formations in North America}} thumb | right | Dinosaur Park Formation in Dinosaur Provincial Park, Alberta The '''Judith River Group''' is a group of geologic formations in western North America dating from the late Cretaceous and noted as a site for the extensive excavation of dinosaur fossils.<ref>{{cite journal |last1=Sternberg |first1=Charles H. |title=Notes on the Judith River Group |journal=Science |date=1903 |volume=17 |issue=439 |pages=870–872 |doi=10.1126/science.17.439.870.b |jstor=1629928 |issn=0036-8075}}</ref> The formation is named after the Judith River in Montana. The group is also called the '''Judith River Wedge'''.<ref>{{cite journal |last1=Wilson |first1=John P. |last2=Fowler |first2=Denver W. |title=The easternmost occurrence of Saurornitholestes from the Judith River Formation, Montana, indicates broad biogeographic distribution of Saurornitholestes in the Western Interior of North America |journal=Historical Biology |date=2 December 2021 |volume=33 |issue=12 |pages=3302–3306 |doi=10.1080/08912963.2020.1862828 |url=https://www.tandfonline.com/doi/abs/10.1080/08912963.2020.1862828 |access-date=15 November 2024 |language=en |issn=0891-2963|url-access=subscription }}</ref> It is stratigraphically equivalent with the Belly River Group in Alberta.<ref>{{cite journal |last1=Eberth |first1=David A. |title=Stratigraphic architecture of the Belly River Group (Campanian, Cretaceous) in the plains of southern Alberta: Revisions and updates to an existing model and implications for correlating dinosaur-rich strata |journal=PLOS ONE |date=25 January 2024 |volume=19 |issue=1 |article-number=e0292318 |doi=10.1371/journal.pone.0292318 |doi-access=free |pmid=38271406 |pmc=10810474 |language=en |issn=1932-6203}}</ref><ref>{{cite journal |last1=Rogers |first1=Raymond R. |last2=Eberth |first2=David A. |last3=Ramezani |first3=Jahandar |title=The "Judith River−Belly River problem" revisited (Montana-Alberta-Saskatchewan): New perspectives on the correlation of Campanian dinosaur-bearing strata based on a revised stratigraphic model updated with CA-ID-TIMS U-Pb geochronology |journal=Geological Society of America Bulletin |date=28 July 2023 |doi=10.1130/B36999.1 |url=https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/136/3-4/1221/627333/The-Judith-River-Belly-River-problem-revisited |access-date=15 November 2024|url-access=subscription }}</ref>

It comprises the Judith River Formation in north central Montana, as well as the Foremost, Oldman, and Dinosaur Park formations in Alberta and Saskatchewan in Canada.<ref>{{cite journal |last1=Sankey |first1=Julia T. |last2=Brinkman |first2=Donald B. |last3=Guenther |first3=Merrilee |last4=Currie |first4=Philip J. |title=Small theropod and bird teeth from the late Cretaceous (late Campanian) Judith River Group, Alberta |journal=Journal of Paleontology |date=July 2002 |volume=76 |issue=4 |pages=751–763 |doi=10.1666/0022-3360(2002)076<0751:STABTF>2.0.CO;2 |language=en |issn=0022-3360|url=http://doc.rero.ch/record/14410/files/PAL_E1494.pdf }}</ref> The wedge is exposed discontinuously in river drainages.

== References == <references />

==External links==

Category:Geologic groups of Montana Category:Geologic groups of Alberta Category:Geologic groups of Saskatchewan Category:Cretaceous Montana Category:Cretaceous Alberta Category:Cretaceous Saskatchewan