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Fossils tell the story of deep time. Period information can help organize a description, but specimen-level records still matter most.
The final age of non-avian dinosaurs, ending with the Cretaceous–Paleogene extinction.
Context: Hell Creek, Kem Kem, Pierre Shale · Examples: Dinosaur teeth and bones, mosasaurs, ammonites
A Cretaceous label covers very different countries and land regimes. Buyers should require a specific formation, locality context, land type, and export history rather than relying on the period name.
A period of major dinosaur diversification alongside abundant marine reptiles and ammonites.
Context: Morrison, Solnhofen, Holzmaden · Examples: Sauropod bones, Stegosaurus plates, ammonites, ichthyosaurs
Jurassic specimens in commerce can come from U.S. private quarries, European limestone operations, or restricted public sites. Formation and ownership records matter more than the broad age label.
Recovery after the end-Permian extinction and the emergence of early dinosaurs and other archosaurs.
Context: Chinle, Moenkopi · Examples: Phytosaur teeth, petrified wood, early reptiles
Many well-known Triassic exposures are protected public land. A seller should identify the formation and lawful collection context without publishing sensitive site coordinates.
Mammals, birds, and flowering-plant ecosystems diversified after the end-Cretaceous extinction.
Context: Green River, White River · Examples: Fossil fish, insects, early mammals, leaves
Commercial Green River material is common, but quarry identity, repairs, paint, and plate assembly still affect provenance and condition assessment.
Modern mammal groups diversified, grasslands expanded, and large sharks occupied marine ecosystems.
Context: Hawthorn, Calvert · Examples: Megalodon teeth, shark teeth, marine mammals
For shark teeth, measured size, restoration, root completeness, locality, and legal collection access are more useful than a period label when comparing specimens.
Repeated glacial cycles, large mammals, and human expansion characterize the most recent geologic period.
Context: La Brea, cave deposits, river gravels, and permafrost · Examples: Mammoth teeth, Ice Age mammal bones, and subfossil material
Recent fossil and subfossil material can intersect wildlife, ivory, cultural-property, and import rules. Buyers should verify the material, age claim, origin, and destination-country requirements.