There are 32 fossil localities from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences

Youngest Fossil Listed

72.1 Ma (Late/Upper Cretaceous)

Oldest Fossil Listed

265 Ma (Permian)

Stratigraphic Units

Unit	No. Occurrences	Age
Livingston - Cokedale	5	83.6 - 72.1 Ma (Late/Upper Cretaceous)
Morrison	9	150.8 - 89.8 Ma (Mesozoic)
Piper	12	170.3 - 168.3 Ma (Middle Jurassic)
Dinwoody	5	252.17 - 247.2 Ma (Phanerozoic)
Shedhorn	1	265.1 - 259.9 Ma (Permian)

Fossils from Region

Click here to show the list.

Accepted Name	Hierarchy	Age
Gastropoda class	Animalia : Mollusca : Gastropoda	83.6 - 72.1 Ma Late/Upper Cretaceous
Bivalvia class	Animalia : Mollusca : Bivalvia	83.6 - 72.1 Ma Late/Upper Cretaceous
Theropoda unranked clade	Animalia : Chordata : Saurischia : Theropoda	157.3 - 152.1 Ma Jurassic
Allosaurus genus	Animalia : Chordata : Reptilia : Dinosauria : Allosauridae : *Allosaurus*	157.3 - 152.1 Ma Jurassic
Apatosaurus genus	Animalia : Chordata : Reptilia : Dinosauria : Diplodocidae : *Apatosaurus*	157.3 - 152.1 Ma Jurassic
Diplodocus genus	Animalia : Chordata : Reptilia : Dinosauria : Diplodocidae : *Diplodocus*	157.3 - 152.1 Ma Jurassic
Camarasaurus genus	Animalia : Chordata : Reptilia : Dinosauria : Camarasauridae : *Camarasaurus*	157.3 - 152.1 Ma Jurassic
Ornithopoda unranked clade	Animalia : Chordata : Ornithischia : Ornithopoda	157.3 - 152.1 Ma Jurassic
Monoclonius genus	Animalia : Chordata : Ornithischia : Ceratopsidae : *Monoclonius*	83.6 - 72.1 Ma Late/Upper Cretaceous
Dinosauria order	Animalia : Chordata : Reptilia : Dinosauria	83.6 - 72.1 Ma Late/Upper Cretaceous
Amphicoelias genus	Animalia : Chordata : Saurischia : *Amphicoelias*	157.3 - 152.1 Ma Jurassic
Plantae kingdom	Plantae	83.6 - 72.1 Ma Late/Upper Cretaceous
Testudines order	Animalia : Chordata : Reptilia : Testudines	157.3 - 152.1 Ma Jurassic
Hesperosaurus mjosi species	Animalia : Chordata : Ornithischia : Stegosauridae : Hesperosaurus : *Hesperosaurus mjosi*	157.3 - 152.1 Ma Jurassic
Procostatoria sexradiata species	Animalia : Mollusca : Bivalvia : Trigoniida : Costatoriidae : Procostatoria : *Procostatoria sexradiata*	265.1 - 259.9 Ma Permian
Myalinella postcarbonica species	Animalia : Mollusca : Bivalvia : Myalinida : Myalinidae : Myalina : *Myalinella postcarbonica*	252.17 - 251.3 Ma Phanerozoic
Lingularia borealis species	Animalia : Brachiopoda : Lingulata : Lingulida : Lingulidae : Lingularia : *Lingularia borealis*	252.17 - 251.3 Ma Phanerozoic
Claraia aurita species	Animalia : Mollusca : Bivalvia : Pectinida : Pterinopectinidae : Claraia : *Claraia aurita*	252.17 - 251.3 Ma Phanerozoic
Promyalina spathi species	Animalia : Mollusca : Bivalvia : Myalinida : Myalinidae : Promyalina : *Promyalina spathi*	252.17 - 251.3 Ma Phanerozoic
Sohlites spinosus species	Animalia : Mollusca : Cephalopoda : Ammonoidea : Sohlites : *Sohlites spinosus*	170.3 - 168.3 Ma Middle Jurassic
Parachondroceras andrewsi species	Animalia : Mollusca : Cephalopoda : Ammonoidea : Otoitidae : Parachondroceras : *Parachondroceras andrewsi*	170.3 - 168.3 Ma Middle Jurassic
Parachondroceras filicostatum species	Animalia : Mollusca : Cephalopoda : Ammonoidea : Otoitidae : Parachondroceras : *Parachondroceras filicostatum*	170.3 - 168.3 Ma Middle Jurassic
Austrotindaria svalbardensis species	Animalia : Mollusca : Bivalvia : Nuculanida : Neilonellidae : Neilonella : *Austrotindaria svalbardensis*	252.17 - 251.3 Ma Phanerozoic

Fossil Localities

Click to show 11 fossil localities

Localities in this Region

USA

Montana
- Gallatin County
  - Gallatin Mining District
    - Tom Miner Basin

Other Regions, Features and Areas that Intersect

North AmericaContinent

Rocky MountainsMountain Range

North America PlateTectonic Plate

Crazy Mountains BasinBasin
Middle Rocky MountainsOrogenic Belt

North America Plate

Northern Rocky MountainsWide Rift
Wyoming DomainDomain

USA

Absaroka RangeMountain Range
Western Phosphate fieldMineral Province
Yellowstone National ParkNational Park

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

Quick NavTop Fossils Localities in Region Other Regions

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 22, 2026 10:40:09 Page updated: August 22, 2026 14:09:35

Go to top of page

Gallatin Mining District, Gallatin County, Montana, USAiRegional Level TypesGallatin Mining DistrictMining District Gallatin CountyCounty MontanaState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

List of minerals for each chemical element

Fossils

Localities in this Region

Other Regions, Features and Areas that Intersect

Gallatin Mining District, Gallatin County, Montana, USA i
Regional Level Types
Gallatin Mining District Mining District
Gallatin County County
Montana State
USA Country