Latest Cretaceous terrestrial deposits famous for dinosaurs, plants, turtles, crocodilians, fish, and mammals.
RegionMontana, North Dakota, South Dakota, and Wyoming, USA
Best recordFormation + source
Risk controlLegality + disclosure
Commonly associated fossils
- dinosaur teeth and bone
- plant fossils
- turtle shell
- microvertebrates
Collector cautions
- federal-land vertebrate collecting requires permits and specimens remain public property
- private-land provenance should be documented
- scientifically significant material deserves expert review
Provenance questions
- What is the most precise locality that can be responsibly shared?
- What formation, member, quarry, or horizon is claimed?
- Who collected it, when, and on what type of land?
- Was export documentation required, and does paperwork accompany the specimen?
- What preparation, stabilization, repair, or assembly occurred after collection?
Why locality affects identification
Fossil groups have geographic and stratigraphic ranges. Matrix, preservation style, associated fauna, and preparation traditions can support or contradict a locality claim. A famous locality name should never substitute for documentation.
Build a comparison set
Use listings to compare morphology, matrix, preparation, locality claims, dimensions, repairs, and seller disclosure. Similar appearance alone does not establish identity or legality.
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