Judith River Group Explained

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.^[1] The formation is named after the Judith River in Montana. The group is also called the Judith River Wedge.^[2] It is stratigraphically equivalent with the Belly River Group in Alberta.^{[3] [4]}

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.^[5] The wedge is exposed discontinuously in river drainages.

References

1. Sternberg . Charles H. . Notes on the Judith River Group . Science . 1903 . 17 . 439 . 870–872 . 10.1126/science.17.439.870.b . 1629928 . 0036-8075.
2. Wilson . John P. . Fowler . Denver W. . The easternmost occurrence of Saurornitholestes from the Judith River Formation, Montana, indicates broad biogeographic distribution of Saurornitholestes in the Western Interior of North America . Historical Biology . 2 December 2021 . 33 . 12 . 3302–3306 . 10.1080/08912963.2020.1862828 . 15 November 2024 . en . 0891-2963. subscription .
3. Eberth . David A. . 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 . PLOS ONE . 25 January 2024 . 19 . 1 . e0292318 . 10.1371/journal.pone.0292318 . free . 38271406 . 10810474 . en . 1932-6203.
4. Rogers . Raymond R. . Eberth . David A. . Ramezani . Jahandar . 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 . Geological Society of America Bulletin . 28 July 2023 . 10.1130/B36999.1 . 15 November 2024. subscription .
5. Sankey . Julia T. . Brinkman . Donald B. . Guenther . Merrilee . Currie . Philip J. . Small theropod and bird teeth from the late Cretaceous (late Campanian) Judith River Group, Alberta . Journal of Paleontology . July 2002 . 76 . 4 . 751–763 . 10.1666/0022-3360(2002)076<0751:STABTF>2.0.CO;2 . en . 0022-3360.