Judith River Formation
Montana, USA
A geological formation noted for extensive dinosaur fossils. It is named after the Judith River of Montana.
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The Judith River Formation (JRF from now on) is a member of the Judith River Group, which also comprises several other formations:
- Foremost formation (Alberta, Canada)
- Oldman formation (Alberta, Canada)
- Dinosaur park formation (Alberta, Canada)
The formation dates to the late Cretaceous, between 79 and 75.3 million years ago.
It produces fossils of various species including amphibians, bony fish, cartilagionous fish, plesiosaurs, pterosaurs, crocodilians, lizards, turtles, and various genus of dinosaur.
The dinosaur fossils from the site are probably the most famous and the most studied, and include tyrannosaurs, dromaeosaurs, and dozens of others.
Wikipedia has a good writeup on species from the formation, although a dedicated book or whitepaper would likely be a better source.
Further reading
- https://en.wikipedia.org/wiki/Judith_River_Formation
- https://en.wikipedia.org/wiki/Judith_River_Group
- https://harvest.usask.ca/items/c74f11f2-0cab-49fb-8e49-cb5f3e90ef3c
If you are interested in other classic American locales we may have stock from the following locales.
American locales
Arizona
- Southwest Mine, Hendricks Gulch, Bisbee, Cochise County, Arizona, USA
- Total Wreck Mine, Cienega Creek, The Narrows, Empire Mining District, Empire Mountains, Pima County, Arizona, USA
- Monterey formation, San Luis Obispo County, California, USA
- New Melones Dam, West Belt, Calaveras County, California, USA
- Salton Sea, Imperial County, California, USA
- Green River Formation (spanning areas of Colorado, Utah, and Wyoming.)
- Lake George, Park County, Colorado, USA
- Stoneham, Weld County, Colorado, USA
- Anacondas Yerington open pit, Yerington, Yerington Mining District, Singatse Range, Lyon County, Nevada, USA
- Hat lease, Goldfield Mining District, Esmeralda County, Nevada, USA
- Virgin Valley, Humboldt County, Nevada, USA
- Cedar Hill Quarry, Lancaster County, Pennsylvania, USA
- Pottsville Formation, St. Clair, Schuylkill County, Pennsylvania, USA
- Iron Mountain, Pinto Iron Mining District, Iron Springs Mining District, Iron County, Utah, USA
- Topaz Mountain, Thomas Range, Juab County, Utah, USA
For the rest of our American stock, see below.
United States of America
Fossils from the USA - Meteorites from the USA - Minerals from the USA